Malicious PDF — malware analysis report

Static analysis result for SHA-256 149a740ea0fdb582…

MALICIOUS

PDF

41.0 KB Created: 2020-08-29 08:31:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ac481aa4b6ce8d76f92ee6aebfc3acae SHA-1: 5710dfb0f07ef760fd9e8072b8aea93c13134877 SHA-256: 149a740ea0fdb582f936d4720d824d30c914002f3ed370b66a97cf6db3809365
154 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, ttraff.com, which is disguised as a document about armature winding. The document also contains a large number of links to other PDFs hosted on Shopify, likely for SEO manipulation or to appear legitimate. The ML classifier strongly indicated maliciousness, and the overall structure suggests a phishing or redirection 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.com/wix?keyword=armature+winding+pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0437/6163/1384/files/blender_3d_2._8.pdf
    • https://cdn.shopify.com/s/files/1/0431/3835/1255/files/45493935508.pdf
    • https://cdn.shopify.com/s/files/1/0433/8984/5671/files/40665465559.pdf
    • https://cdn.shopify.com/s/files/1/0434/1674/8188/files/6109781886.pdf
    • https://cdn.shopify.com/s/files/1/0432/4284/8413/files/peresewopubavev.pdf
    • https://cdn.shopify.com/s/files/1/0433/9793/9349/files/gowedikewir.pdf
    • https://cdn.shopify.com/s/files/1/0438/1720/5920/files/disable_youtube_autoplay.pdf
    • https://cdn.shopify.com/s/files/1/0432/7099/6128/files/appraisal_form_appraisee_comments.pdf
    • https://cdn.shopify.com/s/files/1/0429/2352/4259/files/99025598016.pdf
    • https://cdn.shopify.com/s/files/1/0434/6681/7696/files/mafozelug.pdf
    • https://cdn.shopify.com/s/files/1/0428/9118/2243/files/fundamentals_of_engineering_thermodynamics_7th_edition.pdf
    • https://cdn.shopify.com/s/files/1/0435/4346/2037/files/ace_academy_notes_for_gate_cse_pdf.pdf
    • https://static.usrfiles.com/ugd/b8c837_362ce055998348668a5072dc3eb203d9.pdf
    • https://static.usrfiles.com/ugd/b8c837_7fa446c470eb4569818538220fc8a54d.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_off000063d9.bin
72384fd8b12c119dd73bea0a5977888627a3b78e93913579df840ba4adf56058
pdf-font-stream PDF embedded font (sfnt) at offset 0x63D9 5232 bytes
font_01_sfnt_off0000759b.bin
d10c94d8fe2942e1d1f15b1e57012320a45996ceb96eb52f5331578177b28b82
pdf-font-stream PDF embedded font (sfnt) at offset 0x759B 9988 bytes