Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b88a3b3c9d2d75d…

MALICIOUS

PDF

42.5 KB Created: 2020-08-10 06:58:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b9be7a7444f1ed00e4028429b5e06715 SHA-1: e8cf722e4fca18fd1a8a551759bc89445e095cda SHA-256: 7b88a3b3c9d2d75d33552aa4b3b19ce69116c7127a45ec64e03f5994afa1c0bb
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to what appears to be a link farm designed for SEO manipulation. One critical heuristic identified a link to known malicious redirector infrastructure, specifically 'ttraff.com'. The ML classifier also strongly flagged this PDF as malicious. The embedded links suggest an attempt to drive traffic to malicious sites, likely for phishing or malware distribution.

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.com/pify?keyword=difference+between+arbitration+and+mediation+pdf
    • http://files.stopittop.com/uploads/1/3/1/8/131856545/5817370.pdf
    • http://files.penobsession.com/uploads/1/3/1/4/131438759/4968164.pdf
    • http://files.quartzvanitydirect.com/uploads/1/3/1/3/131384229/bekafemujezezexo.pdf
    • http://files.mirroryourbrilliance.com/uploads/1/3/1/8/131856195/luxuseduken.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0434/0259/2410/files/mepumopawonosadarutomo.pdf
    • https://cdn.shopify.com/s/files/1/0437/2388/2664/files/16571838931.pdf
    • https://cdn.shopify.com/s/files/1/0434/4047/2229/files/tuburonepume.pdf
    • https://cdn.shopify.com/s/files/1/0436/4225/7561/files/pathfinder_bestiary_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0434/5207/2086/files/84430553064.pdf
    • https://cdn.shopify.com/s/files/1/0437/7113/4106/files/gurivawepamixo.pdf
    • https://cdn.shopify.com/s/files/1/0436/6349/1222/files/49728775319.pdf
    • https://cdn.shopify.com/s/files/1/0437/7745/8334/files/importance_of_organic_matter_in_soil_fertility.pdf
    • https://cdn.shopify.com/s/files/1/0428/0595/2671/files/validity_test.pdf
    • https://cdn.shopify.com/s/files/1/0436/1243/8685/files/geruwaxo.pdf
    • https://cdn.shopify.com/s/files/1/0433/1785/4373/files/xagisobekifusuposafeko.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_off000067b7.bin
8d4409d88c631d1cbe683d8f1bfb8979a416a7910a921fb038a4609443ced162
pdf-font-stream PDF embedded font (sfnt) at offset 0x67B7 5320 bytes
font_01_sfnt_off000079cc.bin
ba741b40eee9552cea97e5d424d61e1d8ba9adda146b38daa15c4f1c623dde03
pdf-font-stream PDF embedded font (sfnt) at offset 0x79CC 10188 bytes