Malicious PDF — malware analysis report

Static analysis result for SHA-256 7ca341929782588f…

MALICIOUS

PDF

55.4 KB Created: 2020-08-06 04:18:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2f2792a4c35bf758f3bc080fb52c321a SHA-1: f7b9d0443ee145d7b9aed176193dc99d827b7648 SHA-256: 7ca341929782588f4fbb29adb5c7b05b31c83e2d44498576dd590cf3deece9e3
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one critical heuristic identifying a link to a known malicious redirector. The document body, though heavily corrupted, contains text suggesting it is a PDF related to French spelling, likely a lure. The presence of many external PDF links, some pointing to benign Shopify domains and others to unknown domains, suggests a link farm or SEO poisoning tactic to distribute malicious content. The ML classifier strongly indicates maliciousness.

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.cc/pify?keyword=l+orthographe+fran%25C3%25A7ais+pdf
    • http://files.precisionwallinc.com/uploads/1/3/1/0/131070204/tapubupogorumaz-kazovesej-domusorufe.pdf
    • http://files.a2saraduvall.com/uploads/1/3/2/6/132681415/nevirovupubezojeti.pdf
    • http://files.porterranchchiropractic.net/uploads/1/3/1/0/131071277/gutotis.pdf
    • http://fuzik.pureblissbakeryoc.com/uploads/1/3/1/4/131482952/relowifotux-fowononoda-tavore-kupodejazipu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0436/4930/2693/files/wuzujesunogale.pdf
    • https://cdn.shopify.com/s/files/1/0432/0939/2285/files/sevarumekedivunofonorozo.pdf
    • https://cdn.shopify.com/s/files/1/0429/6956/3290/files/43221729987.pdf
    • https://cdn.shopify.com/s/files/1/0438/5836/2518/files/el_aleph_borges_italiano.pdf
    • https://cdn.shopify.com/s/files/1/0437/5658/5121/files/zorelidiwodato.pdf
    • https://cdn.shopify.com/s/files/1/0435/2868/3674/files/99330583260.pdf
    • https://cdn.shopify.com/s/files/1/0431/7249/5519/files/82365211181.pdf
    • https://cdn.shopify.com/s/files/1/0433/4501/9035/files/84878566900.pdf
    • https://cdn.shopify.com/s/files/1/0431/1701/9292/files/juzexokibitor.pdf
    • https://cdn.shopify.com/s/files/1/0430/2936/4889/files/10357917329.pdf
    • https://cdn.shopify.com/s/files/1/0431/3199/4280/files/lenifenurumobo.pdf
    • https://cdn.shopify.com/s/files/1/0436/7250/2425/files/cornerstone_church_semi_valley.pdf
    • https://cdn.shopify.com/s/files/1/0433/8316/0995/files/34192879635.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000877d.bin
191a04aece55113af1c49e84d1ac1b522820c434d5160cae1c91f30e60afc586		 pdf-font-stream PDF embedded font (sfnt) at offset 0x877D 5180 bytes
font_01_sfnt_off0000991e.bin
d50990bb7a6698e86af3c0ab02cb85804506e3bf58b525262b4580d26b90976c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x991E 12576 bytes
font_02_sfnt_off0000bffe.bin
1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBFFE 4324 bytes

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