Malicious PDF — malware analysis report

Static analysis result for SHA-256 33a251a0ef800bfe…

MALICIOUS

PDF

46.4 KB Created: 2020-08-15 05:08:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e31c37cf7f79eb63d6b6d773a92eea22 SHA-1: ae1cdceb390d42f1bd6074c59674a7354bc3b67a SHA-256: 33a251a0ef800bfefefd79ffcdec7460f1c215c9807c4da7f24054845c62a288
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to a link farm hosted on Shopify. The primary malicious link, https://ttraff.ru/pify?keyword=android+multi+tools+software+for+pc, is identified as a malicious redirector. This suggests the document is designed to direct users to potentially harmful content through a series of redirects, likely for phishing or malware distribution.

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=android+multi+tools+software+for+pc
    • http://files.district13masons.org/uploads/1/3/2/8/132814050/1338133.pdf
    • http://files.ontariomotorcycleaccidentlaw.com/uploads/1/3/1/3/131384401/nagexiletu-nometumik-molederekulusij.pdf
    • http://files.lionsgateatl.org/uploads/1/3/0/8/130814644/b3a6a20d279.pdf
    • http://files.electaylin.com/uploads/1/3/2/7/132740320/8322645.pdf
    • http://zalebefe.saltlakecountyjuniorlivestock.com/uploads/1/3/0/7/130738531/sopamawesexuf-fapakavo-latezuma.pdf
    • https://cdn.shopify.com/s/files/1/0432/2538/3074/files/memexubobipurubivake.pdf
    • https://cdn.shopify.com/s/files/1/0433/5442/3464/files/batch_file_commands_list_with_examples.pdf
    • https://cdn.shopify.com/s/files/1/0433/9898/7941/files/57379396797.pdf
    • https://cdn.shopify.com/s/files/1/0431/5670/1348/files/baberupawafez.pdf
    • https://cdn.shopify.com/s/files/1/0432/6581/8789/files/calculus_early_transcendentals_2nd_edition_briggs.pdf
    • https://cdn.shopify.com/s/files/1/0429/9295/9642/files/suxukufes.pdf
    • https://cdn.shopify.com/s/files/1/0433/9472/8103/files/game_design_theory_keith_burgun.pdf
    • https://cdn.shopify.com/s/files/1/0440/5441/3462/files/wordly_wise_book_8_lesson_2.pdf
    • https://cdn.shopify.com/s/files/1/0430/8549/6482/files/wetuzeminojeserexa.pdf
    • https://cdn.shopify.com/s/files/1/0432/6886/6212/files/wifufumepodutajipida.pdf
    • https://cdn.shopify.com/s/files/1/0433/3476/2654/files/research_budget_sample.pdf
    • https://cdn.shopify.com/s/files/1/0428/5143/4652/files/nowokuledelikaruma.pdf
    • https://cdn.shopify.com/s/files/1/0432/1961/5904/files/resident_evil_4_rom.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_off000076ea.bin
66acabfe2fc92fe99f555a0fbd0f3333fcc3ec5cfd60393562abf5f52eefe72e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x76EA 5384 bytes
font_01_sfnt_off00008928.bin
5c4597376283a812f743a6f6f70ba5b4f4fc5cb343dcde28941aa9d820a2d020		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8928 10316 bytes

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