Malicious PDF — malware analysis report

Static analysis result for SHA-256 f0c8257fbaa62bd0…

MALICIOUS

PDF

50.2 KB Created: 2020-07-10 11:36:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2020-09-15
MD5: e1585c31bd155e17d9f7d0b76c537c4c SHA-1: 7d2933fdffbdbe19591cf6cebb53545cae0300e0 SHA-256: f0c8257fbaa62bd0a8c3037064f98105076be16e25c96b27c938b201ad50a851
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a significant number of embedded links, many of which point to domains associated with redirector infrastructure or link farms. The heuristic PDF_MALICIOUS_REDIRECTOR_LINK specifically flags a URL leading to traff.ru, indicating a malicious redirector. The ML classifier also strongly indicated maliciousness. The document body, though malformed, contains the same URLs, reinforcing the intent to lure users to external sites.

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://ttraff.ru/wb?keyword=browser%20object%20model%20pdf In PDF document text
    • http://files.chicagoschoolofgrappling.com/uploads/1/3/1/4/131409170/312064.pdfIn PDF document text
    • http://files.ghghuk.com/uploads/1/3/0/7/130739509/237f0c.pdfIn PDF document text
    • http://files.rhfarmersmarket.com/uploads/1/3/1/4/131437753/bofilukovegolafo.pdfIn PDF document text
    • http://files.gccprodesignsupport.net/uploads/1/3/1/6/131637168/nofilunadatuzowegeja.pdfIn PDF document text
    • http://files.bluespringsjewelry.com/uploads/1/3/1/4/131483391/9507331.pdfIn PDF document text
    • http://files.thewillowworks.org/uploads/1/3/1/4/131438002/xorekezapa.pdfIn PDF document text
    • http://files.exquisitetastebydonna.com/uploads/1/3/1/4/131438840/fawoxoxeji.pdfIn PDF document text
    • http://files.fortcollinscd.org/uploads/1/3/1/1/131163514/sezixisa_fabokanonibi_wobusuwasidako.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://lamofozeguve.files.wordpress.com/2020/06/42706168797.pdfIn PDF document text
    • https://kudikinojov.files.wordpress.com/2020/07/nuwanujezimati.pdfIn PDF document text
    • https://futidufesag.files.wordpress.com/2020/06/favasamaborelekugafo.pdfIn PDF document text
    • https://takovime.files.wordpress.com/2020/06/12578352470.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/mojijemorewowasimagaxo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/51982080438.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/71409998288.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/73121007565.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/95509007145.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007c87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7C87 5080 bytes
SHA-256: 225aa6b286009847465002f875208fa5cd24072232997501c985812fcb0acd8d
font_01_sfnt_off00008dea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8DEA 14368 bytes
SHA-256: c05b965ae14a6aaeb65ba9302ad94c3d6a902b08173c472c2449d1ef6ffd9a24

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