Malicious PDF — malware analysis report

Static analysis result for SHA-256 7834a760cd430f89…

MALICIOUS

PDF

34.2 KB Created: 2020-08-18 15:55:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 02f6770a016540bc4121108d1285644c SHA-1: f23f87a4127ebd61a6c73f6c0a1e99a4c62bd451 SHA-256: 7834a760cd430f8908ae45d45670f6c3a8a6a9f4b2c96784c5a7edfe512a8f11
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one critical heuristic identifying it as a redirector to malicious infrastructure. The document body, though heavily obfuscated, contains a URL that appears to be a lure for a printer user guide, which redirects to the malicious `ttraff.ru` domain. The presence of many external links, some pointing to benign Shopify URLs and others to unknown domains, suggests a link farm or SEO poisoning tactic to increase visibility.

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=brother+printer+user+guide+hl-+l2390dw
    • http://sirove.barrowriverartsfestival.com/uploads/1/3/1/4/131437736/zavedopowi.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0436/2944/5273/files/acuerdo_final_de_paz_resumen.pdf
    • https://cdn.shopify.com/s/files/1/0431/2278/6466/files/music_theory_for_computer_musicians.pdf
    • https://cdn.shopify.com/s/files/1/0429/9938/2170/files/sibumubotobit.pdf
    • https://cdn.shopify.com/s/files/1/0429/4764/1510/files/que_son_calicatas.pdf
    • https://cdn.shopify.com/s/files/1/0431/0417/4233/files/pojegaxulowulokogovuja.pdf
    • https://cdn.shopify.com/s/files/1/0433/4593/6534/files/xesebupitopetekogekari.pdf
    • https://cdn.shopify.com/s/files/1/0435/1007/1460/files/71258915387.pdf
    • https://cdn.shopify.com/s/files/1/0430/5852/8405/files/tom_leinster_basic_category_theory.pdf
    • https://cdn.shopify.com/s/files/1/0441/0189/4296/files/video_er_free_app_for_android.pdf
    • https://cdn.shopify.com/s/files/1/0434/3264/0664/files/98804262031.pdf
    • https://cdn.shopify.com/s/files/1/0434/4925/4048/files/tupokifaxolesokiwenogo.pdf
    • https://cdn.shopify.com/s/files/1/0431/2740/6746/files/crown_fell_out.pdf
    • https://cdn.shopify.com/s/files/1/0433/6510/5814/files/bland_diet_spanish.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_off00004714.bin
1ed91d4446a36a5675cedca18d9efc61ba70414863b514cac56b70724a971821
pdf-font-stream PDF embedded font (sfnt) at offset 0x4714 5776 bytes
font_01_sfnt_off00005ad4.bin
4de4aa065d9b05c65d95d537527643169a58504131bf65ee28c3b551c785bc8f
pdf-font-stream PDF embedded font (sfnt) at offset 0x5AD4 9752 bytes