Malicious PDF — malware analysis report

Static analysis result for SHA-256 f28dd4cb3b6aa214…

MALICIOUS

PDF

43.6 KB Created: 2020-08-04 15:16:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0d7c628a14e10cfa558dd525ba4a7b6e SHA-1: 017196dc671cbdf220bf649926888e44729c5654 SHA-256: f28dd4cb3b6aa214277a56961592a73c4ac30039ef78bf189fd5410ce33828e1
152 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with a critical heuristic firing indicating a link to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains the URL 'https://ttraff.ru/pify?keyword=casio+g+shock+manual+pdf', suggesting a lure to disguise malicious redirection. The presence of a large number of external PDF links, many hosted on Shopify, further supports the SEO-based lure tactic.

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=casio+g+shock+manual+pdf
    • http://files.familieshelpingfamiliessolanocounty.com/uploads/1/3/1/3/131382841/velemetejugor_xepifivobexu.pdf
    • http://files.summoningstone.janaoliver.com/uploads/1/3/1/6/131606331/7213656.pdf
    • http://files.xzibitstudios.com/uploads/1/3/1/3/131398334/tuzofirarukeb-dotajunedula-lisoluwilup.pdf
    • http://files.lancernation.org/uploads/1/3/1/0/131071312/roponiwarixoxesowi.pdf
    • https://cdn.shopify.com/s/files/1/0439/1773/8152/files/87230592934.pdf
    • https://cdn.shopify.com/s/files/1/0431/8124/4577/files/java_priority_queue_comparator.pdf
    • https://cdn.shopify.com/s/files/1/0431/6397/5835/files/44554728747.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/nuruge.pdf
    • https://cdn.shopify.com/s/files/1/0430/6193/6285/files/80896516106.pdf
    • https://cdn.shopify.com/s/files/1/0427/9736/7452/files/81969016427.pdf
    • https://cdn.shopify.com/s/files/1/0433/0268/2789/files/76021805482.pdf
    • https://cdn.shopify.com/s/files/1/0430/9093/5969/files/77135258310.pdf
    • https://cdn.shopify.com/s/files/1/0429/7018/5879/files/raxup.pdf
    • https://cdn.shopify.com/s/files/1/0429/5180/3033/files/6617235000.pdf
    • https://cdn.shopify.com/s/files/1/0433/2286/7880/files/94926173947.pdf
    • https://cdn.shopify.com/s/files/1/0432/2259/7796/files/33321508906.pdf
    • https://cdn.shopify.com/s/files/1/0432/5936/3488/files/71240822900.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_off0000690f.bin
ee806ee88576b35e7ac568382eae014206a4497c6ffb2a9f4ffc787b6a32456a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x690F 5444 bytes
font_01_sfnt_off00007b71.bin
dcd2eb4f937f18a5af29856a03605b9e62879367acd646f6557fcd3c9f0f25e6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7B71 11340 bytes

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