Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d6bce1874e49667…

MALICIOUS

PDF

39.3 KB Created: 2020-08-19 17:30:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 71de65403630fc941cae6ca5063c062a SHA-1: 5cc49a3b617aa67d967dcc75be8590cd7e96ef2d SHA-256: 5d6bce1874e49667a12d85323979b67bd02b090dc6057809c5e3354c87d16206
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links, with a critical heuristic firing indicating it links to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains the URL https://ttraff.cc/pify?keyword=assetto+corsa+tracks, which is flagged as malicious. The presence of a large number of external PDF links, many pointing to benign Shopify URLs but interspersed with unknown domains, suggests a link farm or SEO manipulation tactic, potentially to host or distribute further malicious 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.cc/pify?keyword=assetto+corsa+tracks
    • http://bafuwosef.culturalinnovationgroup.org/uploads/1/3/0/9/130969746/22b8c1.pdf
    • http://files.adperformancehorses.com/uploads/1/3/1/3/131397940/foxodikuf.pdf
    • http://zikofo.eating2heal.com/uploads/1/3/1/4/131453536/zerofonuvefexe_digokejifomivex_jivenijabowu.pdf
    • http://loxel.emptyvessels.org/uploads/1/3/1/4/131437987/dd2f8134867.pdf
    • http://palos.gmfseminole.com/uploads/1/3/0/8/130813592/tusap.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0436/4166/7734/files/weight_loss_gym_workout.pdf
    • https://cdn.shopify.com/s/files/1/0432/8026/9462/files/brixham_college_uniform.pdf
    • https://cdn.shopify.com/s/files/1/0438/0514/7298/files/comfort_sentry_thermostat_manual.pdf
    • https://cdn.shopify.com/s/files/1/0431/5018/0512/files/zafat.pdf
    • https://cdn.shopify.com/s/files/1/0435/0276/4184/files/20508238382.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/94430640368.pdf
    • https://cdn.shopify.com/s/files/1/0431/1970/6279/files/unitech_cable_trunking_catalogue.pdf
    • https://cdn.shopify.com/s/files/1/0437/2103/1832/files/yaseen_e_shareef.pdf
    • https://cdn.shopify.com/s/files/1/0435/2563/6248/files/33422869438.pdf
    • https://cdn.shopify.com/s/files/1/0430/1894/4665/files/98951862515.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/40133843423.pdf
    • https://cdn.shopify.com/s/files/1/0440/1161/8462/files/footprints_in_the_sand_poem.pdf
    • https://cdn.shopify.com/s/files/1/0437/5894/4405/files/16376033804.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000530f.bin
59490ebb646214a1b0c556eb38b3e006d81d2df06dee1ee82c3f5bb30b874b13		 pdf-font-stream PDF embedded font (sfnt) at offset 0x530F 4448 bytes
font_01_sfnt_off0000622f.bin
4fa135487ebfe9f3ffae7ff4cab9a279e09d098a44f6def73c1c0945fd231007		 pdf-font-stream PDF embedded font (sfnt) at offset 0x622F 9252 bytes
font_02_sfnt_off000081e0.bin
cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34		 pdf-font-stream PDF embedded font (sfnt) at offset 0x81E0 4324 bytes

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