Malicious PDF — malware analysis report

Static analysis result for SHA-256 871527e6d369536e…

MALICIOUS

PDF

42.7 KB Created: 2020-08-10 05:57:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 49328e975c08dd3443f2ba3af9a128bc SHA-1: 2350f703f1fdbddf714ce31e3ee8c35f160ed971 SHA-256: 871527e6d369536e320a4039a572d6aa4ae31ab59e629a6130979796eccacfe6
174 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links, many of which point to a link farm designed to host malicious content. One prominent link redirects to known malicious infrastructure, suggesting a phishing or malware distribution attempt. The presence of a callback lure heuristic further supports a social engineering pretext.

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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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=civic+education+pdf+download
    • http://files.protectthegame.com/uploads/1/3/1/4/131483020/vobatel.pdf
    • http://files.ctsulianah.com/uploads/1/3/1/4/131409090/mexudexalafelumul.pdf
    • http://files.giggleboxsocks.com/uploads/1/3/1/4/131409017/vedumadob_jerixevuvimis_vuwazepijamis_mizonoza.pdf
    • http://luxosetiz.findingancestors.net/uploads/1/3/1/4/131407995/livatufisod.pdf
    • http://files.magnoliabodyworks.com/uploads/1/3/1/4/131437832/vajijevibejipubi.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/7418/2563/files/memirev.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/juzopuzenafososokazulu.pdf
    • https://cdn.shopify.com/s/files/1/0440/8773/8533/files/bagopekojisuxe.pdf
    • https://cdn.shopify.com/s/files/1/0431/7272/4900/files/heat_index_formula.pdf
    • https://cdn.shopify.com/s/files/1/0436/0732/6882/files/15000286141.pdf
    • https://cdn.shopify.com/s/files/1/0435/5093/3156/files/speaking_english_book.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/jewaxepolirabosumasedud.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/denikiv.pdf
    • https://cdn.shopify.com/s/files/1/0434/7186/3961/files/ludinexokezuraritu.pdf
    • https://cdn.shopify.com/s/files/1/0444/4736/7335/files/body_systems_webquest_answer_key.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/1188956193.pdf
    • https://cdn.shopify.com/s/files/1/0430/3434/5625/files/shurflo_4008-_101-_a65.pdf
    • https://cdn.shopify.com/s/files/1/0435/6135/3371/files/6607343133.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000069f0.bin
6468b6ff58cde1437bed791109a92e9af07cfe34ed8fea9cee0156eb3c3f079c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x69F0 4932 bytes
font_01_sfnt_off00007ae8.bin
c2a59b7bf5a4e38a464c923fdb5c9b8497bee35e7f23ee1a242aa7fdddb56f32		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7AE8 10312 bytes

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