Malicious PDF — malware analysis report

Static analysis result for SHA-256 843b719b54fb3ba9…

MALICIOUS

PDF

57.2 KB Created: 2020-09-02 00:15:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 26fe969d7dd4b1b3b72c948d7ca99c7e SHA-1: 41e1675e983b91cdf84fd1c72257a5ebcbfe8fd8 SHA-256: 843b719b54fb3ba9f0762475c2a72d179dd11f98ce42fbb7981db995e4171917
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a lure related to a "Yakutat fishing report" and embeds a large number of links, many of which point to external PDFs. One of these links, https://ttraff.cc/wix?keyword=yakutat+fishing+report, is identified as a malicious redirector. This suggests the document is part of a link farm or SEO poisoning campaign designed to drive traffic to malicious infrastructure, likely for further exploitation or phishing.

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.cc/wix?keyword=yakutat+fishing+report
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0435/3523/7269/files/19620992852.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/15138334831.pdf
    • https://cdn.shopify.com/s/files/1/0434/6108/3301/files/butumumepivab.pdf
    • https://cdn.shopify.com/s/files/1/0433/6756/3429/files/22835441974.pdf
    • https://cdn.shopify.com/s/files/1/0438/4060/2269/files/kumagipamubamumevibo.pdf
    • https://cdn.shopify.com/s/files/1/0460/9032/2084/files/72395512694.pdf
    • https://cdn.shopify.com/s/files/1/0430/1537/2953/files/85969736937.pdf
    • https://cdn.shopify.com/s/files/1/0463/1130/9469/files/nufigiwelu.pdf
    • https://cdn.shopify.com/s/files/1/0432/0431/3247/files/atoms_and_molecules_class_9_questions_and_answers.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/wugituvunajobi.pdf
    • https://cdn.shopify.com/s/files/1/0431/4100/5480/files/lizizimavipulosuniw.pdf
    • https://cdn.shopify.com/s/files/1/0432/9213/1484/files/cartas_illuminati_traducidas_al_espaC3B1ol.pdf
    • https://cdn.shopify.com/s/files/1/0435/3864/5144/files/how_to_create_a_fax_cover_sheet.pdf
    • https://static.usrfiles.com/ugd/ab922d_3b3c826223934d129b074c597cd1c582.pdf
    • https://static.usrfiles.com/ugd/911c12_3edcaeb24ade43bd8a54948c38713e65.pdf
    • https://static.usrfiles.com/ugd/61c57f_67e3d289bab44a3e9edbfe6a67682ab2.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_off0000a147.bin
fea8a3d7474e3ef9161193b817e9320188e9d382b2f06e7eca3e8169ea4b7deb		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA147 5156 bytes
font_01_sfnt_off0000b2d8.bin
7394a3518a572004388be6ca3cde4389335e78d37405f10496a2f7d5d5b1fbf0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB2D8 10696 bytes

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