Malicious PDF — malware analysis report

Static analysis result for SHA-256 6647b2f17be8c97b…

MALICIOUS

PDF

40.9 KB Created: 2020-08-19 06:11:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fbbf5ef677b56ad4c18cc6a6f4b85d99 SHA-1: 06ceeb055d0ba729bc33a480751322b796805055 SHA-256: 6647b2f17be8c97bb395d370c7b0d2d102fbc382e716ef8dbba22aadb0dfa382
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links, many pointing to Shopify-hosted PDFs, suggesting a link farm designed to distribute malicious content. One prominent link, 'https://ttraff.ru/pify?keyword=free++java+7+update+80', is flagged as a malicious redirector, indicating an attempt to lead users to harmful sites. The ML classifier strongly supports the malicious nature of this PDF.

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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=free++java+7+update+80
    • http://files.bevpurduefineart.com/uploads/1/3/1/4/131453253/4135604.pdf
    • http://files.trinitybengals.com/uploads/1/3/1/6/131606360/8058571.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0439/7016/6942/files/zekiw.pdf
    • https://cdn.shopify.com/s/files/1/0434/8955/8680/files/tinifujaxaratesuzenav.pdf
    • https://cdn.shopify.com/s/files/1/0435/3579/4327/files/26935589901.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/mowojemabedeju.pdf
    • https://cdn.shopify.com/s/files/1/0431/2465/4241/files/15278263980.pdf
    • https://cdn.shopify.com/s/files/1/0431/9608/8481/files/rarezotafedurevumorefato.pdf
    • https://cdn.shopify.com/s/files/1/0429/9181/2767/files/consonant_clusters_activities.pdf
    • https://cdn.shopify.com/s/files/1/0429/7257/7946/files/kinadopomususesafizawofi.pdf
    • https://cdn.shopify.com/s/files/1/0430/3175/6957/files/7246546038.pdf
    • https://cdn.shopify.com/s/files/1/0430/5453/0709/files/75199348626.pdf
    • https://cdn.shopify.com/s/files/1/0433/9151/6826/files/87661954201.pdf
    • https://cdn.shopify.com/s/files/1/0447/3107/2666/files/blue_cross_blue_shield_of_texas_prior_authorization_form.pdf
    • https://cdn.shopify.com/s/files/1/0438/9024/5787/files/98378253685.pdf
    • https://cdn.shopify.com/s/files/1/0431/1734/6965/files/niwudejomoduvajezazaf.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_off00006132.bin
f44367ef2415a484c59a7fc1133a217be30ee2ffa4772d724401c128e09ec57e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6132 5248 bytes
font_01_sfnt_off0000732d.bin
1e95b7ad9e87a50d857abf755d9432a49dabfce28922fdfd0074d19d15061cea		 pdf-font-stream PDF embedded font (sfnt) at offset 0x732D 10540 bytes

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