Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c9ba0f847fc497d…

MALICIOUS

PDF

42.2 KB Created: 2020-08-19 07:01:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 33ce236ca435eeac82212d31a5042f38 SHA-1: db8165f90f8c065c76b5a625726c090cf810834d SHA-256: 6c9ba0f847fc497d113585a5a1d0c7f96c0b54611c026c45f677d8fa4ddbfd3c
154 Risk Score

Malware Insights

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

This PDF document contains a large number of embedded links, many of which point to Shopify domains hosting other PDFs, and one critical link to a known malicious redirector. The document body, though obfuscated, contains text related to a 'chainsaw sharpener manual' and the malicious URL, suggesting a lure to a phishing or malware distribution site. The ML classifier strongly indicated maliciousness, and the presence of a redirector URL confirms a malicious intent to direct users to harmful content.

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=chicago+chainsaw+sharpener+manual
    • http://files.kempnerumc.org/uploads/1/3/1/4/131453387/7970b7c25fe.pdf
    • http://kigiru.light-surfboards.com/uploads/1/3/0/7/130776131/wabugulemuzan.pdf
    • http://files.mardenridingclub.co.uk/uploads/1/3/0/7/130738512/bozem_pizuzubise.pdf
    • http://files.terselicesl.com/uploads/1/3/1/3/131383319/0309a293db.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/depuwi.pdf
    • https://cdn.shopify.com/s/files/1/0435/6302/4542/files/nijujajulivifu.pdf
    • https://cdn.shopify.com/s/files/1/0430/8818/3456/files/gefusififofamade.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/kulabegidubonigupux.pdf
    • https://cdn.shopify.com/s/files/1/0432/3000/3357/files/vobanigeruliwipul.pdf
    • https://cdn.shopify.com/s/files/1/0435/0397/6614/files/48333567114.pdf
    • https://cdn.shopify.com/s/files/1/0437/6766/0706/files/lasopajanosimurep.pdf
    • https://cdn.shopify.com/s/files/1/0428/8466/1407/files/47017053049.pdf
    • https://cdn.shopify.com/s/files/1/0430/4984/4890/files/love_stories_in_telugu.pdf
    • https://cdn.shopify.com/s/files/1/0430/6157/5834/files/71506444021.pdf
    • https://cdn.shopify.com/s/files/1/0430/3467/3301/files/10751129738.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_off0000674a.bin
e96fc0c7a0fe5c3e3f1e221cac413861cceaec7cf43bb477a24b8bffe9fc2491		 pdf-font-stream PDF embedded font (sfnt) at offset 0x674A 5344 bytes
font_01_sfnt_off00007952.bin
7cbd8b446459f9837075ff2d484aea1efca5831f18ad79627735e567819e7756		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7952 10204 bytes

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