Malicious PDF — malware analysis report

Static analysis result for SHA-256 f755c02b0f176841…

MALICIOUS

PDF

46.7 KB Created: 2020-08-22 03:47:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1787cb8a63d20bd4989ba3f9aa2b5d16 SHA-1: 9d7a255cf026e483c8420fc82210e9e3b9c4ed02 SHA-256: f755c02b0f176841d95087f727cf4e4124cc10043b69b1c4fae23e45e6cac75a
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF file contains numerous embedded links, with a critical heuristic identifying a link to a known malicious redirector. The document body, though heavily obfuscated, contains the URL that leads to this redirector. The presence of a large number of external PDF links suggests a link farm or SEO poisoning attempt. The ML classifier also strongly indicated maliciousness.

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=tibetan+singing+bowl+music+deep+meditation
    • http://files.mutiny-cannabis.com/uploads/1/3/0/8/130813301/3998859.pdf
    • http://files.dcscorpus.com/uploads/1/3/2/7/132712447/dibuvatinonogot_kutipubeb_zofixozaf_vavipazowe.pdf
    • https://cdn.shopify.com/s/files/1/0431/0849/9618/files/vemaserabetet.pdf
    • https://cdn.shopify.com/s/files/1/0449/5353/4632/files/31067147433.pdf
    • https://cdn.shopify.com/s/files/1/0438/5443/0368/files/2726045594.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/70686619693.pdf
    • https://cdn.shopify.com/s/files/1/0438/2444/7638/files/gmp_guidelines_for_pharmaceuticals.pdf
    • https://cdn.shopify.com/s/files/1/0465/5762/6518/files/8928657627.pdf
    • https://cdn.shopify.com/s/files/1/0430/5210/5881/files/aptitude_questions_and_answers_for_accenture.pdf
    • https://cdn.shopify.com/s/files/1/0432/8921/5129/files/42178201665.pdf
    • https://cdn.shopify.com/s/files/1/0431/8108/0725/files/nusuwu.pdf
    • https://cdn.shopify.com/s/files/1/0464/1344/7336/files/audio_recorder_pro_apk_free.pdf
    • https://cdn.shopify.com/s/files/1/0429/9423/7589/files/vujuxakafetuzixobovugo.pdf
    • https://cdn.shopify.com/s/files/1/0431/5122/9089/files/wozidowapamuzefupufuvab.pdf
    • https://cdn.shopify.com/s/files/1/0437/8741/9806/files/89315543433.pdf
    • https://cdn.shopify.com/s/files/1/0429/1677/4054/files/77677208666.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006b42.bin
9542a116d138b265c4882f9113d19e3c4f43916f31be220c94b7e8e87dc6e563		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6B42 3396 bytes
font_01_sfnt_off00007768.bin
98354a9bced90fd6db0dd833eeb69ed539e9d0287a6e334f33301e4214e8f11a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7768 5480 bytes
font_02_sfnt_off000089ff.bin
4a85230cd01faf37b87434dacb213a1a7b3a22fc4eda833c647da238be33e2ed		 pdf-font-stream PDF embedded font (sfnt) at offset 0x89FF 10352 bytes

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