Malicious PDF — malware analysis report

Static analysis result for SHA-256 23b9e14041b32d9d…

MALICIOUS

PDF

36.1 KB Created: 2020-08-06 03:02:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 24c18df64c6c1770dd68b8bbdc6f5fea SHA-1: 8e862ce0005ec0e676858fc9b1a03552c0821886 SHA-256: 23b9e14041b32d9da2694a07b5ddc5ef7d4ad5052ecf2d27303639a76b45d39e
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'https://ttraff.ru/pify?keyword=ielts+reading+recent+actual+test+with+answers+pdf'. This URL is presented within the document body, disguised as a link to IELTS reading materials. The ML classifier also strongly flagged this PDF as malicious. The presence of numerous other PDF links, many hosted on Shopify, suggests a link farm or SEO poisoning tactic to distribute the malicious redirector.

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=ielts+reading+recent+actual+test+with+answers+pdf
    • http://files.coachchoo.com/uploads/1/3/0/7/130776599/4072934.pdf
    • http://files.manchesterfashionweek.com/uploads/1/3/0/9/130969896/zejugeg-dulupama-biwameduvatu-toxekesodo.pdf
    • http://files.rftchurch.com/uploads/1/3/2/3/132302859/1001906.pdf
    • http://files.signsbylynn.com/uploads/1/3/2/6/132683001/lexabavovot_zemotume_balopo_basezi.pdf
    • http://files.tngluxuriesboutique.com/uploads/1/3/0/8/130813366/jolinivawul-ropame-nululazim-sufavilupaman.pdf
    • https://cdn.shopify.com/s/files/1/0440/4314/1285/files/afinidades_electivas_de_goethe.pdf
    • https://cdn.shopify.com/s/files/1/0431/5663/5816/files/innova_3306_manual.pdf
    • https://cdn.shopify.com/s/files/1/0432/7302/7749/files/tokajibigawofipexerisozu.pdf
    • https://cdn.shopify.com/s/files/1/0435/2681/5903/files/todepemotajerejowinabitid.pdf
    • https://cdn.shopify.com/s/files/1/0435/9543/2099/files/all_oll_algorithms.pdf
    • https://cdn.shopify.com/s/files/1/0439/0912/0152/files/91692502413.pdf
    • https://cdn.shopify.com/s/files/1/0435/4893/4295/files/soruma.pdf
    • https://cdn.shopify.com/s/files/1/0431/9713/7056/files/dusotuvofowuv.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/lebalod.pdf
    • https://cdn.shopify.com/s/files/1/0430/8258/0130/files/96914698586.pdf
    • https://cdn.shopify.com/s/files/1/0432/3796/5979/files/79207949804.pdf
    • https://cdn.shopify.com/s/files/1/0436/5913/3081/files/36056271829.pdf
    • https://cdn.shopify.com/s/files/1/0431/0745/1042/files/30494651373.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/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004f06.bin
af5959c534e0e0608f12ff6843720e40191b3ab4e5ef1c53b5249ab427a5e78a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4F06 5444 bytes
font_01_sfnt_off00006199.bin
22c5dfe331c0f8859c720feb190f818724a39a07b2f1931b05523e9a31e6cba3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6199 9660 bytes

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