Malicious PDF — malware analysis report

Static analysis result for SHA-256 23dd20078032bbd8…

MALICIOUS

PDF

51.2 KB Created: 2020-10-14 23:05:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-13
MD5: 192d39c502b0aa43ff94236022b30b54 SHA-1: d1fdbead95a8cdaac3dea56cb5e5eb7613be3ec6 SHA-256: 23dd20078032bbd8575be664773b3191b9bf5b18766256141781ed092389f0f9
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1190 Exploit Public-Facing Application

The PDF document contains a large number of embedded links, many pointing to disposable hosting services like Weebly and Mozfiles. The heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' indicates that at least one link directs to known malicious infrastructure. The ML classifier also strongly flagged this PDF as malicious. The primary purpose appears to be SEO manipulation or distributing further malicious content through a link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://gettraff.ru/pify?keyword=up+%25E1%25BA%25A3nh+hd+facebook+android In PDF document text
    • https://fijojonibiw.weebly.com/uploads/1/3/2/6/132681787/5648329.pdfIn PDF document text
    • https://nudojafobedem.weebly.com/uploads/1/3/1/3/131379550/veliwuji-juderekevasaxa-lamexita.pdfIn PDF document text
    • https://fijojonibiw.weebly.com/uploads/1/3/2/6/132681787/4106527.pdfIn PDF document text
    • https://bedizegoresupa.weebly.com/uploads/1/3/1/3/131379398/bewomo.pdfIn PDF document text
    • https://dutitujazekap.weebly.com/uploads/1/3/0/8/130814390/tunitulo.pdfIn PDF document text
    • https://site-1043613.mozfiles.com/files/1043613/gojabugifirimalebered.pdfIn PDF document text
    • https://zoveponezewuda.weebly.com/uploads/1/3/0/7/130738822/laxojajigoluv.pdfIn PDF document text
    • https://vuzevarezevarot.weebly.com/uploads/1/3/0/7/130740461/3f7bdb1fc.pdfIn PDF document text
    • https://zoxuzuxebexot.weebly.com/uploads/1/3/0/9/130969059/dekefomivupe-kovak-talajonipa-fedebiraroz.pdfIn PDF document text
    • https://povutepumik.weebly.com/uploads/1/3/2/7/132741486/2769223.pdfIn PDF document text
    • https://dutitujazekap.weebly.com/uploads/1/3/0/8/130814390/18ad995.pdfIn PDF document text
    • https://keniwuki.weebly.com/uploads/1/3/1/4/131483234/tebavu_mofevuz_punoxibera_gijipomole.pdfIn PDF document text
    • https://vuxozajuje.weebly.com/uploads/1/3/1/3/131379873/7d7b6617ab8.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://cdn.shopify.com/s/files/1/0433/9020/6101/files/56068375309.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0496/9267/2157/files/gidipexefededizu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0476/8982/6460/files/enhancement_shaman_guide_vanilla.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0494/1696/2215/files/rowakaxaguxodijulesuwe.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/5550/4795/files/craigslist_glen_burnie_rooms_for_rent.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fb537db3-4d48-48dc-9874-ecaa45019990/82159128150.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4a7b0540-03c9-4631-8e27-89b5c8c5ea92/xozusesewebojudafom.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/58544c8b-420a-41fa-91c4-3f84a0096167/fopuwufasiki.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ac518257-4d65-4bb3-a194-327aed298e7c/zevalejexubisapowijege.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3efa855e-9437-4057-bb19-5cba60ae5017/lomotuzu.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006444.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6444 5200 bytes
SHA-256: 85810a57496db6c3baacf5a3d20200a4c3ead97d15e72170ad3d33acc8f8ac02
font_01_sfnt_off00007542.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7542 10944 bytes
SHA-256: b491ea672b7899d25700511aa04b91b79181277f3035b4177a7ef24a53fe409c
font_02_sfnt_off00009979.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9979 16228 bytes
SHA-256: 5afb2bdf6cc70b5b11ac87e6f38ea6e2a7d4038797198d5fa75f426573c1c8fc
font_03_sfnt_off0000aedb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAEDB 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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