Malicious PDF — malware analysis report

Static analysis result for SHA-256 776c0ec0dd73df67…

MALICIOUS

PDF

39.6 KB Created: 2020-08-30 21:19:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 13a2f0f679c746bfc471f26abe1918b0 SHA-1: 26350d59016ab0960f43947401492248ab712c4c SHA-256: 776c0ec0dd73df67c02a0ef0e523d1d7fb99188b25717ab8f9e0110916427d2a
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a critical heuristic firing for a malicious redirector link, which is also present in the document body. This link leads to a URL associated with malicious activity. Additionally, the PDF exhibits characteristics of a link farm, with numerous embedded links, suggesting an attempt to distribute malicious content or engage in SEO manipulation for malicious purposes. The ML classifier also strongly flagged this PDF as malicious.

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.link/wix?keyword=wise+man%2527+s+fear+epub
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0428/4219/4083/files/82198460056.pdf
    • https://cdn.shopify.com/s/files/1/0431/7249/5519/files/65273908176.pdf
    • https://cdn.shopify.com/s/files/1/0430/6799/8362/files/agree_disagree_questionnaire_template.pdf
    • https://cdn.shopify.com/s/files/1/0429/9119/0167/files/estrous_cycle_in_cows.pdf
    • https://cdn.shopify.com/s/files/1/0437/5530/7159/files/sofasako.pdf
    • https://static.usrfiles.com/ugd/c162b3_33b1b28cd0464a3dbda36bd5acb95181.pdf
    • https://static.usrfiles.com/ugd/822ecd_f4432a4f749f4f33a8e8cd95147e2db5.pdf
    • https://static.usrfiles.com/ugd/98857b_864d908491b24a8c8fd38d22ac748628.pdf
    • https://static.usrfiles.com/ugd/b8c837_663a55f8981a44bc82b73d35778bb442.pdf
    • https://static.usrfiles.com/ugd/f3cb45_47e39269a78847c196b00af0bf7d5117.pdf
    • https://static.usrfiles.com/ugd/756799_0458c26e426248ffbcd87dc56eda73e6.pdf
    • https://cdn.shopify.com/s/files/1/0436/7689/3334/files/bulletproof_diet_macros.pdf
    • https://cdn.shopify.com/s/files/1/0435/4958/9668/files/ketogenic_diet_foods_list.pdf
    • https://cdn.shopify.com/s/files/1/0432/8649/5397/files/bugowazevutazivuvazofu.pdf
    • https://cdn.shopify.com/s/files/1/0427/5824/2470/files/bosebominurivomojonavis.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_off00005e2c.bin
d71b2e586b850288804374fed46421f25570db1f810690a70607361f5b1052b4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5E2C 5204 bytes
font_01_sfnt_off00006fcb.bin
87f18a94be73694fbc13da0bfe9adbf9cf318a0088b95a11623b575d94b3291c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6FCB 9936 bytes

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