Malicious PDF — malware analysis report

Static analysis result for SHA-256 82c15b660d222604…

MALICIOUS

PDF

41.9 KB Created: 2020-08-02 13:45:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 07b5a18cd0a150213e7f4b64d395707b SHA-1: 75868097e2461ae797fd1c02aecd50d74a79f84b SHA-256: 82c15b660d222604de347335109885d6b2901332871640f46a5dacf0a2ad38e8
174 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, many of which point to a link farm designed to host other PDFs. One prominent link redirects to a known malicious URL, indicating a phishing or redirection attempt. The presence of callback phishing lures suggests a social engineering pretext to trick users into interacting further. No scripts were extracted, but the primary attack vector is the malicious URL redirection.

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=chemistry+seventh+edition+zumdahl+pdf
    • http://files.windowwarehousedraperysupply.com/uploads/1/3/1/4/131483067/fimakidawatudopole.pdf
    • http://files.nicolainickson.com/uploads/1/3/1/3/131378942/297f233a35e2ec.pdf
    • http://files.leechristinebrownlee.com/uploads/1/3/1/1/131164132/5794758.pdf
    • http://files.atallamdshop.com/uploads/1/3/1/3/131379594/bemutugol-vunasevijipivo-sidutukome-kunafosonobisuf.pdf
    • http://files.sproutsmyanmar.com/uploads/1/3/2/3/132302863/giburapudiga-dojowul.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/9220/4950/files/fegamitonixiban.pdf
    • https://cdn.shopify.com/s/files/1/0428/3577/1558/files/mijabewetapunipaga.pdf
    • https://cdn.shopify.com/s/files/1/0432/2911/8627/files/51217824098.pdf
    • https://cdn.shopify.com/s/files/1/0430/6819/4978/files/kumagulesaka.pdf
    • https://cdn.shopify.com/s/files/1/0434/2156/5078/files/wolfgang_puck_pressure_oven_manual.pdf
    • https://cdn.shopify.com/s/files/1/0435/8592/9375/files/h_band_2._0.pdf
    • https://cdn.shopify.com/s/files/1/0429/9682/6261/files/59342381056.pdf
    • https://cdn.shopify.com/s/files/1/0436/1653/4690/files/49266950188.pdf
    • https://cdn.shopify.com/s/files/1/0427/7121/8588/files/58093391603.pdf
    • https://cdn.shopify.com/s/files/1/0435/3431/9776/files/pusanedimi.pdf
    • https://cdn.shopify.com/s/files/1/0430/3159/3113/files/34038962239.pdf
    • https://cdn.shopify.com/s/files/1/0437/0500/8293/files/rejowifixek.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_off00006393.bin
6b43787a814f47bac9aaddf74e3015b5744a3eddeb31fe14842f48025972ef9b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6393 5396 bytes
font_01_sfnt_off000075d3.bin
ae7e996ec7f5b679ab5559b86e45a923319d41dfac07495b3d0348914dc05547		 pdf-font-stream PDF embedded font (sfnt) at offset 0x75D3 10380 bytes

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