Malicious PDF — malware analysis report

Static analysis result for SHA-256 13d875c55430d5c1…

MALICIOUS

PDF

40.2 KB Created: 2020-09-06 20:54:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3147c562af3066457149e0cfce10af92 SHA-1: 1459c0e6cc2d179b358c7d51bc63fba00ec05396 SHA-256: 13d875c55430d5c152473576e8a25b94b7714a5f256d060e5f8dab0ffe5dc160
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a heuristic firing for a malicious redirector link, pointing to 'https://ttraff.club/wix?keyword=kindle+legge+formato+epub'. It also exhibits characteristics of a PDF link farm, with numerous embedded links, many pointing to Shopify-hosted PDFs. The document body contains the malicious URL and appears to be a lure for users interested in Kindle book formats, suggesting a phishing or malware distribution attempt.

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.club/wix?keyword=kindle+legge+formato+epub
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0427/9474/6023/files/zexoxatupomun.pdf
    • https://cdn.shopify.com/s/files/1/0435/5751/9523/files/daxiterekupukotutozivab.pdf
    • https://cdn.shopify.com/s/files/1/0434/2985/5393/files/94823376446.pdf
    • https://cdn.shopify.com/s/files/1/0427/9812/1119/files/tajarumidizitumolu.pdf
    • https://cdn.shopify.com/s/files/1/0434/4414/2245/files/64223260051.pdf
    • https://cdn.shopify.com/s/files/1/0438/8470/7992/files/bilekifasakobudibananelow.pdf
    • https://cdn.shopify.com/s/files/1/0431/3353/4357/files/autodesk_design_review_save_as.pdf
    • https://static.usrfiles.com/ugd/b8c837_8a4c2a3206e74988a977902c2f6c2f71.pdf
    • https://static.usrfiles.com/ugd/120f26_1a3b90d02967479f9e814257050acb28.pdf
    • https://static.usrfiles.com/ugd/b8c837_7edd44ac085d4c6fa20bd1fb0a4a616f.pdf
    • https://static.usrfiles.com/ugd/50c35f_76bdc03a5bb9456587fa5037d70f337e.pdf
    • https://cdn.shopify.com/s/files/1/0437/2715/9448/files/cctv_cable_installation_guide.pdf
    • https://cdn.shopify.com/s/files/1/0432/8272/7067/files/batupiwewigakotafijobuto.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_off00005ffc.bin
3cf416f349ba072beae51986fadf8222f23d1d10e593b1a8f87286436b31a9b3
pdf-font-stream PDF embedded font (sfnt) at offset 0x5FFC 5292 bytes
font_01_sfnt_off000071e8.bin
73d3a1c3824b8dd93caa394fa744b67cfcaa45857490d8dab78c698736584805
pdf-font-stream PDF embedded font (sfnt) at offset 0x71E8 10132 bytes