Malicious PDF — malware analysis report

Static analysis result for SHA-256 11eff9bc85544d8e…

MALICIOUS

PDF

46.9 KB Created: 2020-08-31 02:52:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 43726e23235abc6d7ae13ab499da245b SHA-1: 9700f82c81502dada6e6fac6743dac77b326ee5c SHA-256: 11eff9bc85544d8ea366ab55cefc6815a444ec58e2056fcff2474cd66997d9f6
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, with a critical heuristic firing indicating it links to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains a URL that matches the redirector heuristic. The presence of a large number of external PDF links suggests a link farm or SEO manipulation tactic, potentially to distribute or obscure malicious content.

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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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.com/wix?keyword=anime+quotes+about+love
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/b8c837_54a8aafbb542419fa5888ecb6c672759.pdf
    • https://static.usrfiles.com/ugd/b8c837_7716abd5297f4629bca5cf08fa05de70.pdf
    • https://static.usrfiles.com/ugd/dc98cc_8eccc614c1b24d80a7c53f703da11979.pdf
    • https://cdn.shopify.com/s/files/1/0438/4794/2294/files/rebeloranazevesijodixuz.pdf
    • https://cdn.shopify.com/s/files/1/0431/6338/6016/files/vogevipokofosogikilila.pdf
    • https://cdn.shopify.com/s/files/1/0431/8891/2290/files/72718665555.pdf
    • https://static.usrfiles.com/ugd/96768c_3ee4c99bd20a463483b6d298292b7ac2.pdf
    • https://static.usrfiles.com/ugd/cbdbb6_1c2b871c6606460ea91ff7f110a702e8.pdf
    • https://static.usrfiles.com/ugd/4b68be_763911309eb9470ebd3931c68d6ba942.pdf
    • https://cdn.shopify.com/s/files/1/0454/8660/4438/files/ectopic_pregnancy_guidelines_2019.pdf
    • https://cdn.shopify.com/s/files/1/0429/3374/7878/files/53174474655.pdf
    • https://cdn.shopify.com/s/files/1/0431/0574/7108/files/xovijedusep.pdf
    • https://cdn.shopify.com/s/files/1/0433/1785/4366/files/26640137025.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_off00007a02.bin
fb9d2abc10535a098f194453de0da945951c6ff07c49f70ca2c341836ac909ac
pdf-font-stream PDF embedded font (sfnt) at offset 0x7A02 5048 bytes
font_01_sfnt_off00008b1d.bin
4c1f4ecd7974c0c9f3d4c778fe11b8b9004f93c9cb764b8a10dd0109e05a3403
pdf-font-stream PDF embedded font (sfnt) at offset 0x8B1D 10696 bytes