Malicious PDF — malware analysis report

Static analysis result for SHA-256 0711bd791077cddc…

MALICIOUS

PDF

40.7 KB Created: 2020-08-19 09:11:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0cee38d6e0d9b40f9fa1094417ffd05f SHA-1: 533f57601771a2a0b7b388a63908a0a4ba701eea SHA-256: 0711bd791077cddcc736a775821d0ca73cd973eff0fff410fcaee824f94f5ae5
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one specifically identified as a malicious redirector. The document body, though partially corrupted, suggests a lure related to an 'HR assistant job description'. The presence of many external PDF links, some pointing to benign Shopify domains and others to unknown domains, indicates a link farm or redirection scheme. The ML classifier strongly flagged this PDF as malicious, supporting the conclusion that it is designed to lead users to harmful content.

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.ru/pify?keyword=hr+assistant+job+description+pdf
    • http://siguxozo.plantnerdmelbourne.com/uploads/1/3/1/0/131070487/sarodebeg-xavinenave-beduse.pdf
    • http://kiganu.columbiasoch.com/uploads/1/3/1/4/131406668/nimogitapu-kagomijalafi-xamibiruxu.pdf
    • http://files.chino77thcavalry.com/uploads/1/3/1/4/131411542/4188227.pdf
    • http://files.daviddenson.net/uploads/1/3/0/7/130774962/mexadit.pdf
    • http://files.genarospizza.com/uploads/1/3/0/7/130775859/6e671e4b7e7ca14.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0432/3144/5149/files/faremanuvabelakugowim.pdf
    • https://cdn.shopify.com/s/files/1/0432/0333/0209/files/lowonufojozudovi.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/wurawosupamajo.pdf
    • https://cdn.shopify.com/s/files/1/0434/4617/3852/files/17198706296.pdf
    • https://cdn.shopify.com/s/files/1/0430/7818/9205/files/84850270216.pdf
    • https://cdn.shopify.com/s/files/1/0435/0876/0742/files/saxophone_scales_and_arpeggios.pdf
    • https://cdn.shopify.com/s/files/1/0437/8984/4641/files/zetizapopefomifilegedozi.pdf
    • https://cdn.shopify.com/s/files/1/0431/0210/9856/files/wow_vendor_mounts.pdf
    • https://cdn.shopify.com/s/files/1/0450/0973/1734/files/canape_vector.pdf
    • https://cdn.shopify.com/s/files/1/0433/4115/2421/files/used_vehicle_information_package_ontario.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_off0000616f.bin
fe69b450fe32aed4c33f3e2baf1288e4b484981fce0ea05456fb03a00c3d865f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x616F 5292 bytes
font_01_sfnt_off00007373.bin
0543d8d1ae7fa3572f4b5dcbff50519b9a8ffd98b89ec7dd84ff826855fab528		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7373 10108 bytes

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