Malicious PDF — malware analysis report

Static analysis result for SHA-256 851094c05864322d…

MALICIOUS

PDF

45.3 KB Created: 2020-08-12 20:45:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c2b62e70ed6a3e358b41ceace09eedb8 SHA-1: 2ea1d52eacbd0a11c457d171af154fb43263b3ec SHA-256: 851094c05864322dc92a3aaa5329162064fe9123e58891b3b175990642ebdd55
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to Shopify domains, but one critical link directs to a known malicious redirector. This suggests a link farm or SEO poisoning tactic to distribute malicious content. The document body, though partially corrupted, contains the URL https://ttraff.ru/pify?keyword=technical+letter+writing+pdf, which is flagged as a malicious redirector, indicating the primary intent is to lead the user to harmful infrastructure.

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=technical+letter+writing+pdf
    • http://vitin.theandywallace.com/uploads/1/3/1/0/131069934/99f4a559059.pdf
    • http://wawuz.ultimatefantasyfighting.net/uploads/1/3/0/8/130813042/xododarejeg.pdf
    • http://files.michelleblanchette.com/uploads/1/3/0/7/130775590/xepeva_gosaviditime_murazavepi.pdf
    • http://files.heritageecc.com.au/uploads/1/3/0/7/130775432/b7a91b287662043.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0434/0632/7957/files/10723236007.pdf
    • https://cdn.shopify.com/s/files/1/0427/9179/6902/files/90678893116.pdf
    • https://cdn.shopify.com/s/files/1/0434/1714/1415/files/franchising_your_business.pdf
    • https://cdn.shopify.com/s/files/1/0432/4114/4483/files/namibaje.pdf
    • https://cdn.shopify.com/s/files/1/0432/5621/7750/files/zozaji.pdf
    • https://cdn.shopify.com/s/files/1/0435/4523/1515/files/48695723701.pdf
    • https://cdn.shopify.com/s/files/1/0432/7417/4622/files/26985954459.pdf
    • https://cdn.shopify.com/s/files/1/0433/0674/6011/files/52250469916.pdf
    • https://cdn.shopify.com/s/files/1/0431/9975/8497/files/buzor.pdf
    • https://cdn.shopify.com/s/files/1/0430/5430/1338/files/kijuxavelovuxotos.pdf
    • https://cdn.shopify.com/s/files/1/0431/7141/4173/files/lejemiban.pdf
    • https://cdn.shopify.com/s/files/1/0428/8030/3270/files/60475007728.pdf
    • https://cdn.shopify.com/s/files/1/0433/3653/2136/files/mofutubexodoseralawop.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007221.bin
d614ca03f680f6b8557d2ce027ce98f5034594c3295e1112f8a57e560d2762d6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7221 5280 bytes
font_01_sfnt_off00008419.bin
89eac6a6afbfe7f0bada1f843323c4f0f0d70c7d05e71d1c4a4e2b2732701ff8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8419 10648 bytes

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