Malicious PDF — malware analysis report

Static analysis result for SHA-256 bdced601af3aef74…

MALICIOUS

PDF

44.0 KB Created: 2020-08-18 16:16:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2ac4c1c6285fa569af8822e573d4de59 SHA-1: 36bf5457b202b1cc28e3cb6537d9b26532f9e9bc SHA-256: bdced601af3aef744aae27be6c5938c5d61afcec541e0ed07ebe8abb3da825f3
154 Risk Score

Malware Insights

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

The PDF contains a deceptive document body that appears to be a weather report, but it embeds a link to a malicious redirector. This redirector then leads to a large collection of other PDF files hosted on various domains, suggesting a link farm designed to distribute malicious content or engage in SEO poisoning. The ML classifier strongly supports the malicious nature of this PDF.

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.com/pify?keyword=weather+report+in+tanda+gujrat+punjab+pakistan
    • http://guwopuvu.throwawayyourtextbook.com/uploads/1/3/0/7/130739592/wabevokoxaruxi.pdf
    • http://pemake.calgarytouchrugby.com/uploads/1/3/1/1/131164250/4470299.pdf
    • http://zazov.protectparkofkeir.com/uploads/1/3/0/7/130739919/7230150.pdf
    • http://files.kerryanemonahan.com/uploads/1/3/0/8/130874253/918abaf30924a9.pdf
    • http://files.littleinspirationsmn.com/uploads/1/3/1/4/131482886/580a8.pdf
    • https://cdn.shopify.com/s/files/1/0432/2754/5763/files/biophilic_architecture_case_study.pdf
    • https://cdn.shopify.com/s/files/1/0430/2376/1571/files/30775416187.pdf
    • https://cdn.shopify.com/s/files/1/0430/3906/4225/files/rumoxusunibufesovakafo.pdf
    • https://cdn.shopify.com/s/files/1/0431/6564/7012/files/zumutizemutuzelo.pdf
    • https://cdn.shopify.com/s/files/1/0429/3669/6999/files/41442555387.pdf
    • https://cdn.shopify.com/s/files/1/0430/2903/7219/files/rejazopa.pdf
    • https://cdn.shopify.com/s/files/1/0436/9498/1273/files/fisiopatologia_del_cancer_de_lengua.pdf
    • https://cdn.shopify.com/s/files/1/0434/5063/0296/files/sibozaxipibenosuzone.pdf
    • https://cdn.shopify.com/s/files/1/0459/9214/9154/files/baskin_robbins_cake_nutrition_information.pdf
    • https://cdn.shopify.com/s/files/1/0431/9058/3458/files/moligizililipozal.pdf
    • https://cdn.shopify.com/s/files/1/0432/0142/9662/files/tekivefudexorusufe.pdf
    • https://cdn.shopify.com/s/files/1/0434/0455/8488/files/beeman_pellet_gun.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_off0000680f.bin
8660697f96ace553763bfa0861830068588e133cfd57789119d70002f1743158		 pdf-font-stream PDF embedded font (sfnt) at offset 0x680F 5484 bytes
font_01_sfnt_off00007ab6.bin
7302a744724878b930db046b5f0296ffb3557d37a0d81afc5a32c20857e5e27c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7AB6 12748 bytes

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