Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a8861e292ad92e9…

MALICIOUS

PDF

43.0 KB Created: 2020-10-02 08:42:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 6abf1459dbadce1de98c156e1580eeb3 SHA-1: 5b358984aae5f2dac66d8dce4bd21f98c14805ea SHA-256: 3a8861e292ad92e9ea1ba85723acbd21624b8820f301a41b1c0ba40d98f0190d
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded links, with one identified as a malicious redirector. The document's structure and link farm characteristics suggest it is designed to drive traffic to potentially malicious or SEO-manipulated sites. The ML classifier also strongly indicated maliciousness.

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=firex+smoke+alarm+1182 In PDF document text
    • https://site-1036873.mozfiles.com/files/1036873/nosipuwitufivivaw.pdfIn PDF document text
    • https://site-1037245.mozfiles.com/files/1037245/pakutus.pdfIn PDF document text
    • https://site-1038758.mozfiles.com/files/1038758/18946882221.pdfIn PDF document text
    • http://files.nbltwowayradio.com/uploads/1/3/0/7/130776022/pofojanimafutuwod.pdfIn PDF document text
    • http://pemekefe.brightsidecbd.com/uploads/1/3/1/4/131453540/garakaruxov-laxazinedikuma-talizofuv.pdfIn PDF document text
    • http://vigij.fairfieldplantationfire.com/uploads/1/3/0/7/130740026/pamal.pdfIn PDF document text
    • http://files.bigtable.net/uploads/1/3/1/4/131454549/xulejiroxo.pdfIn PDF document text
    • http://files.millionaireoutlook.com/uploads/1/3/2/6/132682976/nomilejepefagig.pdfIn PDF document text
    • http://files.newlifechurchmo.org/uploads/1/3/1/4/131483009/2197298.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0484/7209/6918/files/firiposumorerilojenapogi.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000686b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x686B 5296 bytes
SHA-256: 982fb97e1001f4fd278c158aa657b677e840fdb75ca56f4636bf590ffdc7c108
font_01_sfnt_off00007a60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7A60 10320 bytes
SHA-256: 36534fbd87d84d0310a18158ba3678a50ac6d4adefbca5ffbe070671a1e38709

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