Malicious PDF — malware analysis report

Static analysis result for SHA-256 2d8729c190017051…

MALICIOUS

PDF

45.8 KB Created: 2020-08-08 18:58:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e34e58085b3233d9011b4a7ffbfea2c1 SHA-1: 1888cf2b4c92d8f934106843dbaf9fa8267de87a SHA-256: 2d8729c190017051d405541059b8d38b551a71316d2934c936c5bb0e6ce481f9
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF was flagged by multiple critical heuristics indicating malicious redirector links and a link farm. The ML classifier also strongly indicated maliciousness. The document body contains numerous URLs, with one pointing to a known malicious redirector. The primary attack pattern appears to be SEO poisoning via a PDF link farm, likely leading to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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.
  • 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/pify?keyword=caida+de+la+urss+resumen+pdf
    • http://files.wickenburgsoccer.com/uploads/1/3/0/7/130740563/be53f284f6f2e.pdf
    • http://files.ksguns60478.com/uploads/1/3/1/3/131379246/topegone_fuxuvumises_waduwezuguja.pdf
    • http://talunum.alpinecbd.co/uploads/1/3/0/9/130969472/7a77fd6ba.pdf
    • http://files.greatersandhills-greatercarolina.org/uploads/1/3/1/1/131163898/jiwupe_kirusujuje_lurezif.pdf
    • http://files.martinehrensvard.com/uploads/1/3/0/7/130739544/duwugilegop.pdf
    • https://cdn.shopify.com/s/files/1/0430/9975/0560/files/kozefazemi.pdf
    • https://cdn.shopify.com/s/files/1/0434/0239/5813/files/dafixanuzunaxizerekuf.pdf
    • https://cdn.shopify.com/s/files/1/0432/7093/0600/files/vebukizazazuro.pdf
    • https://cdn.shopify.com/s/files/1/0427/9504/0924/files/veponepevawa.pdf
    • https://cdn.shopify.com/s/files/1/0427/6997/3415/files/piwikonadeb.pdf
    • https://cdn.shopify.com/s/files/1/0432/7538/7043/files/42875163097.pdf
    • https://cdn.shopify.com/s/files/1/0438/0613/0337/files/gokiwunegog.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/41732402988.pdf
    • https://cdn.shopify.com/s/files/1/0432/4727/2098/files/xevojipekiwuwemusex.pdf
    • https://cdn.shopify.com/s/files/1/0433/3728/5797/files/99457718971.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/vasopamomakazemujavinis.pdf
    • https://cdn.shopify.com/s/files/1/0434/7930/2296/files/fiwalosutevo.pdf
    • https://cdn.shopify.com/s/files/1/0430/1576/6177/files/75260108510.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000660c.bin
d399d6cb36714241eb1cf3ee686ec1c33efac6a0023118c88fdadce6f3590ce9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x660C 4900 bytes
font_01_sfnt_off00007689.bin
3191a6a6791f4fb56ebde464de329329ec5b6a2cdf832e0551407481d9caa090		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7689 11124 bytes
font_02_sfnt_off00009aa5.bin
ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9AA5 4324 bytes

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