Malicious PDF — malware analysis report

Static analysis result for SHA-256 3bb72f0b21d0d4a8…

MALICIOUS

PDF

40.8 KB Created: 2020-08-30 22:48:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cc8946d7dc84b8e857f432fe31aa5967 SHA-1: 049e2c079952318d71b5ca6c55c8d317d3bbd048 SHA-256: 3bb72f0b21d0d4a84e56c7b68cf25c53da09a4b188fd56dd39b11639e665430c
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged as malicious by a machine learning classifier and contains a critical heuristic indicating it links to known malicious redirector infrastructure. It also exhibits characteristics of a PDF link farm, with numerous external links, many hosted on cdn.shopify.com. The primary malicious URL identified is https://ttraff.ru/wix?keyword=purge+circuit+hydraulique+xantia+hydractive, which is likely used to redirect users to a phishing or malware-hosting site. The document body itself is heavily obfuscated and contains embedded URLs.

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/wix?keyword=purge+circuit+hydraulique+xantia+hydractive
    • https://cdn.shopify.com/s/files/1/0435/1141/4943/files/chocolate_movie_song_malayalam.pdf
    • https://cdn.shopify.com/s/files/1/0454/7484/0742/files/gcse_algebra_worksheets_and_answers.pdf
    • https://cdn.shopify.com/s/files/1/0428/2862/8135/files/49592697028.pdf
    • https://cdn.shopify.com/s/files/1/0431/8353/8331/files/28760542024.pdf
    • https://cdn.shopify.com/s/files/1/0440/1309/3029/files/english_hebrew_interlinear_bible.pdf
    • https://cdn.shopify.com/s/files/1/0431/8684/7903/files/microsoft_office_12.0_access_database_engine_64_bit.pdf
    • https://cdn.shopify.com/s/files/1/0429/8768/4003/files/amor_propio_definicion.pdf
    • https://cdn.shopify.com/s/files/1/0437/4996/5985/files/musibosede.pdf
    • https://cdn.shopify.com/s/files/1/0434/5276/0224/files/duwenepuvoriwizotozif.pdf
    • https://cdn.shopify.com/s/files/1/0439/8658/3710/files/94861008734.pdf
    • https://cdn.shopify.com/s/files/1/0433/9151/6826/files/xebudapiribomenunudu.pdf
    • https://static.usrfiles.com/ugd/078c79_af0f195275d6489db8dde7a259a49106.pdf
    • https://static.usrfiles.com/ugd/3e87bf_bd1153d610b2442da7784173d8d143cc.pdf
    • https://static.usrfiles.com/ugd/c836c3_981da72915fd41df97c2b51f3e661bd7.pdf
    • https://static.usrfiles.com/ugd/b8c837_892a9f32df13495b9abec32675d6c7e3.pdf
    • https://static.usrfiles.com/ugd/d17951_363c013a19b0405789fce56b41098352.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/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005fe3.bin
f68889230d3d7a39b848cc3bb647b00b08f39dd969db0a7bd539f8ae7e0f389f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5FE3 5380 bytes
font_01_sfnt_off00007225.bin
2315fe518a4b74e0d3f25a27d8d6b94943b07f015afdeec98b2cd294fc9c331e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7225 10396 bytes

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