Malicious PDF — malware analysis report

Static analysis result for SHA-256 646fd682ef6bd235…

MALICIOUS

PDF

39.1 KB Created: 2020-08-24 22:53:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 274a6fd5250ef2399375330f2685864a SHA-1: dc1b1b8d1889a4fbcf9d3b0f3ea3e88221e607e3 SHA-256: 646fd682ef6bd2357756f01dd97fde6704b7b733ec855eb55387b0acda5a3ed3
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with a critical heuristic firing for a malicious redirector at 'https://ttraff.ru/pify?keyword=simple+articles+exercises+pdf'. Another critical heuristic identified a PDF link farm, indicating a potential SEO manipulation or distribution scheme. While no scripts were directly extracted, the nature of the links suggests an attempt to redirect users to malicious content or further download stages.

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=simple+articles+exercises+pdf
    • http://nomejil.transpsychlab.org/uploads/1/3/0/7/130738730/jerozomatunofoguwado.pdf
    • http://xorar.willowsmeltingpot.com/uploads/1/3/1/4/131407300/betalil_bapupegedireg_kurimuvugupowe.pdf
    • http://files.councilofgiants.co.uk/uploads/1/3/1/3/131398547/6416889.pdf
    • http://files.frechettefarms.com/uploads/1/3/0/9/130969403/xukukewefarizarek.pdf
    • http://files.thursdayisthenewfriday.org/uploads/1/3/1/3/131383398/sofaraf.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0429/5042/6780/files/wugaxeroper.pdf
    • https://cdn.shopify.com/s/files/1/0429/8843/7655/files/82869864534.pdf
    • https://cdn.shopify.com/s/files/1/0434/4253/6598/files/betoxodanuvij.pdf
    • https://cdn.shopify.com/s/files/1/0436/9799/5944/files/bazaar_kannada_songs_free.pdf
    • https://cdn.shopify.com/s/files/1/0429/5992/9503/files/speaking_skills_importance.pdf
    • https://cdn.shopify.com/s/files/1/0434/0452/5720/files/xilud.pdf
    • https://cdn.shopify.com/s/files/1/0452/5775/2733/files/arterial_blood_gas_analysis_an_easy_learning_guide.pdf
    • https://cdn.shopify.com/s/files/1/0432/5123/7022/files/weight_lifting_workout_routines.pdf
    • https://cdn.shopify.com/s/files/1/0431/1410/2941/files/28383421388.pdf
    • https://cdn.shopify.com/s/files/1/0431/7921/2959/files/uninstall_mysql_mac.pdf
    • https://cdn.shopify.com/s/files/1/0437/2201/4870/files/sound_waves_physics.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_off0000578b.bin
e609c48456e17f825b2aed040bbe78e3ef61391417014daf698e6babf2f535e8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x578B 5472 bytes
font_01_sfnt_off00006a06.bin
271f4d061e712a1d300e71231dbaf615ecd1b1faf9d89875366cfd54d0a7e84b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6A06 11776 bytes

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