Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec9e1890e2a8009c…

MALICIOUS

PDF

49.7 KB Created: 2020-08-08 21:14:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f55202226e5cbf4ac9725e2db741398d SHA-1: a7cea97bdda122abd9f59e23b03ca5e9987bcba6 SHA-256: ec9e1890e2a8009c67008a5cd8db7a07eccb1876b134afd28a1cf4b65e8f3e5c
152 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=b+lactam+antibiotics+pdf'. This URL is likely part of a phishing or malware distribution chain. The document also exhibits characteristics of a link farm, with numerous embedded URLs, many pointing to Shopify domains, suggesting an attempt to obscure the malicious destination. The ML classifier strongly supports the malicious nature of this PDF.

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=b+lactam+antibiotics+pdf
    • http://files.jasonfaulstich.com/uploads/1/3/1/4/131482874/116109.pdf
    • http://zoniwugev.bannisterrunning.com/uploads/1/3/1/0/131070374/desitofibok.pdf
    • http://files.afiniadentalportal.com/uploads/1/3/1/3/131384070/rigofelive-xejapim-dikepawesodozir-mebex.pdf
    • https://cdn.shopify.com/s/files/1/0433/6173/0718/files/73310717228.pdf
    • https://cdn.shopify.com/s/files/1/0432/7351/9269/files/geserokurakurupububiposad.pdf
    • https://cdn.shopify.com/s/files/1/0436/4192/9886/files/video_2_mp3.pdf
    • https://cdn.shopify.com/s/files/1/0438/8945/9368/files/acuerdo_de_paris_onu.pdf
    • https://cdn.shopify.com/s/files/1/0437/6992/1690/files/25047850511.pdf
    • https://cdn.shopify.com/s/files/1/0433/9744/7831/files/masijozadud.pdf
    • https://cdn.shopify.com/s/files/1/0431/8501/2900/files/10200472102.pdf
    • https://cdn.shopify.com/s/files/1/0428/6827/7415/files/83222255629.pdf
    • https://cdn.shopify.com/s/files/1/0448/5152/7842/files/vlc_command_line.pdf
    • https://cdn.shopify.com/s/files/1/0433/3653/2136/files/67774950790.pdf
    • https://cdn.shopify.com/s/files/1/0440/8590/3510/files/dokame.pdf
    • https://cdn.shopify.com/s/files/1/0437/1451/1001/files/disk_utility_can_t_repair_this_disk.pdf
    • https://cdn.shopify.com/s/files/1/0430/4656/8098/files/83549405942.pdf
    • https://cdn.shopify.com/s/files/1/0432/8236/6629/files/19284164217.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_off000084c9.bin
9f13fa77178a40ec94ecad35245c01ab2487d6f323915ad1a72eca8075e65785		 pdf-font-stream PDF embedded font (sfnt) at offset 0x84C9 5392 bytes
font_01_sfnt_off0000970a.bin
c02450e20f63becb2e9889ba5219fdeebf8fc687e6f29989d06e28468880017a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x970A 10168 bytes

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