Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f787662bd2716b0…

MALICIOUS

PDF

32.5 KB Created: 2020-08-22 17:10:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 98477d076915159930756945d7ecfec8 SHA-1: 1740e19979b6a41e43df7b83252617f0adc42e7b SHA-256: 7f787662bd2716b06ab51448d38612ce89b1699c9c3d9199dd51111571f28311
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one identified as a malicious redirector. The document body, though partially corrupted, suggests a lure related to a printer manual. The presence of a large number of external PDF links, many hosted on Shopify, indicates a potential link farm or content stuffing strategy to obscure the malicious intent. No scripts were extracted, but the heuristic firings strongly suggest malicious redirection.

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.cc/pify?keyword=manual+da+brother+dcp-+l2540dw
    • http://jurufexa.kobasfourpawsinstitute.com/uploads/1/3/0/8/130814328/2625796.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0428/3655/7987/files/bakujutaberetawofefula.pdf
    • https://cdn.shopify.com/s/files/1/0437/8502/7745/files/descargar_curriculum_vitae_formato_para_rellenar.pdf
    • https://cdn.shopify.com/s/files/1/0432/8390/6724/files/kugesorasowufozusuvel.pdf
    • https://cdn.shopify.com/s/files/1/0431/9592/4637/files/pibajosotanuxakite.pdf
    • https://cdn.shopify.com/s/files/1/0431/9494/1600/files/liverpool_everton_match_report.pdf
    • https://cdn.shopify.com/s/files/1/0435/4929/4756/files/git_pull_force_update.pdf
    • https://cdn.shopify.com/s/files/1/0435/5650/3707/files/64798816131.pdf
    • https://cdn.shopify.com/s/files/1/0431/6626/9600/files/ritijewotajazom.pdf
    • https://cdn.shopify.com/s/files/1/0433/8427/5109/files/d3_network_graph.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_off0000420e.bin
72976fa99f4adf95cdec10d6404e12d5c99849d7fbdca89f67a2f180464333be
pdf-font-stream PDF embedded font (sfnt) at offset 0x420E 5740 bytes
font_01_sfnt_off000055aa.bin
23de2049bde1f022560ec31a201e3251e7a48426504c1260b583190dd37338b9
pdf-font-stream PDF embedded font (sfnt) at offset 0x55AA 9336 bytes