Malicious PDF — malware analysis report

Static analysis result for SHA-256 3428c48bc1fd85e0…

MALICIOUS

PDF

32.6 KB Created: 2020-08-14 14:01:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8d608d55a1c380d02ad216f17f130aa4 SHA-1: ea9df0020d8349a8354d3972b9aa7a07d24172d9 SHA-256: 3428c48bc1fd85e0cb45945f765941fe61d2d4afab1c46ab4f5c8649b2e1ea51
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to Shopify domains hosting other PDFs, suggesting a link farm for SEO manipulation. One critical link directs to a known malicious redirector at ttraff.ru, indicating a phishing or malware distribution attempt. The ML classifier strongly flagged this PDF as malicious, supporting the conclusion that it is part of a malicious campaign.

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/wb?keyword=ariens%20snowblower%20deluxe%2028%20sho%20manual
    • http://suwidiwox.nbarmichigan.org/uploads/1/3/0/9/130968988/gunaposat.pdf
    • http://files.bowinertia.com/uploads/1/3/2/7/132741144/341804.pdf
    • http://bonisob.cullenelementary.com/uploads/1/3/2/3/132303382/kudinatezixa_vasusego_nitujogipako.pdf
    • http://roxiz.casinopromos4u.com/uploads/1/3/1/6/131606233/jolijutinomu.pdf
    • http://bogeriv.livingwellandsimply.com/uploads/1/3/2/8/132815002/zimudab.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0437/2417/7576/files/xivaregikavumomeni.pdf
    • https://cdn.shopify.com/s/files/1/0432/7555/0873/files/soul_eater_manga_online.pdf
    • https://cdn.shopify.com/s/files/1/0430/2677/6227/files/faxudud.pdf
    • https://cdn.shopify.com/s/files/1/0447/9614/9921/files/25854306804.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/91960476686.pdf
    • https://cdn.shopify.com/s/files/1/0433/9613/7111/files/lowaxorizofupotomumefu.pdf
    • https://cdn.shopify.com/s/files/1/0449/3528/2856/files/space_engineers_dedicated_server_linux.pdf
    • https://cdn.shopify.com/s/files/1/0434/5744/6050/files/wevaxusivimawule.pdf
    • https://cdn.shopify.com/s/files/1/0434/2546/4476/files/billed_for_services_not_performed.pdf
    • https://cdn.shopify.com/s/files/1/0431/8740/4968/files/fodakajizodit.pdf
    • https://cdn.shopify.com/s/files/1/0435/0777/7702/files/xelisotujipewusen.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_off00004438.bin
6d064ee91faadac09dd252289ba43fa9495322582907f489b746278ddadd1331		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4438 5680 bytes
font_01_sfnt_off00005766.bin
b4b7deed64e92af44938bfd299f863a20243823c5cfa3b06a08dacb5ebeaf921		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5766 8756 bytes

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