Malicious PDF — malware analysis report

Static analysis result for SHA-256 4fd9f756f8d36f96…

MALICIOUS

PDF

52.4 KB Created: 2020-08-05 17:25:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f3a0ec876267e6f9fff5d0f7601d36c7 SHA-1: 15116d3aa192623afaa31a1d53b24e3f421ee616 SHA-256: 4fd9f756f8d36f9616149736a40222e3b3d7b5c41d6f5f9bdbce518209081603
152 Risk Score

Malware Insights

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

The PDF was flagged by a machine learning classifier and contains a critical heuristic indicating it links to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains the URL 'https://ttraff.com/pify?keyword=english+old+norse+dictionary.+pdf' which is associated with malicious redirector activity. Additionally, the PDF exhibits characteristics of a link farm, with numerous external links, many pointing to Shopify domains, likely for SEO manipulation or to host further malicious content.

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=english+old+norse+dictionary.+pdf
    • http://kogubim.dsouzaresort.com/uploads/1/3/0/8/130874655/4e4762397d614f.pdf
    • http://files.fsk-midpen.com/uploads/1/3/0/7/130775427/nutigejapofa.pdf
    • http://files.gazetteevents.com/uploads/1/3/1/0/131071253/wasujajamuxi-tijogaro.pdf
    • http://files.nysmathregentsprep.com/uploads/1/3/0/7/130775232/jerurozufade-xujebef-jolibisib-xitokegupe.pdf
    • https://cdn.shopify.com/s/files/1/0440/4209/2694/files/lost_city_quest_osrs.pdf
    • https://cdn.shopify.com/s/files/1/0434/2090/9718/files/30013218745.pdf
    • https://cdn.shopify.com/s/files/1/0429/8535/7463/files/45987980604.pdf
    • https://cdn.shopify.com/s/files/1/0429/8014/7359/files/shovelhead_service_manual.pdf
    • https://cdn.shopify.com/s/files/1/0432/6621/2003/files/tajarigimedisot.pdf
    • https://cdn.shopify.com/s/files/1/0427/7328/2983/files/bopijujadikerim.pdf
    • https://cdn.shopify.com/s/files/1/0438/2379/2285/files/87615799870.pdf
    • https://cdn.shopify.com/s/files/1/0433/9207/3895/files/kunojofazolebasidegupefi.pdf
    • https://cdn.shopify.com/s/files/1/0437/1503/5291/files/how_to_rollback_nvidia_drivers.pdf
    • https://cdn.shopify.com/s/files/1/0434/3860/4450/files/fonelalid.pdf
    • https://cdn.shopify.com/s/files/1/0430/4365/1741/files/griggs_of_vinheim.pdf
    • https://cdn.shopify.com/s/files/1/0428/1165/4307/files/36222848286.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_off000083be.bin
ea3e1ccb4e5cef7057cbe57d29e8ce1b16176c011aec5b71b1f44485bd0d430a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x83BE 5508 bytes
font_01_sfnt_off0000968b.bin
c0408a2dedf2d78a43f723bc93c3e916d1ab6f1c130bd1a0d28be4f665703973		 pdf-font-stream PDF embedded font (sfnt) at offset 0x968B 15036 bytes

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