Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a67c3d67142e56b…

MALICIOUS

PDF

37.1 KB Created: 2020-08-23 11:02:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4ea6d40d91131de845502ffcc848f4e2 SHA-1: 582b9c87dc01bfc0dea90b33b944e955a72aa8db SHA-256: 5a67c3d67142e56bf51cfd2c0e87d67e9bd929f095576efbbc230e22fff54bb0
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link that redirects to malicious infrastructure, disguised as an application form. This is supported by the 'PDF_MALICIOUS_REDIRECTOR_LINK' and 'PDF_SEO_LINK_FARM' heuristics, indicating a phishing or scam attempt. The ML classifier also strongly flagged this PDF as malicious.

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.cc/pify?keyword=argos+store+card+application+form
    • http://files.mtzionweb.com/uploads/1/3/1/8/131856852/517597.pdf
    • http://fozof.woodlandtechnology.org/uploads/1/3/1/4/131408899/51fb281eec.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0428/5035/3318/files/xunin.pdf
    • https://cdn.shopify.com/s/files/1/0429/7005/4805/files/nekojivurepasuv.pdf
    • https://cdn.shopify.com/s/files/1/0434/4394/5628/files/76493344022.pdf
    • https://cdn.shopify.com/s/files/1/0428/6545/9366/files/33837124503.pdf
    • https://cdn.shopify.com/s/files/1/0434/2536/6165/files/6123511670.pdf
    • https://cdn.shopify.com/s/files/1/0431/7321/6411/files/belexerafotofiroseralan.pdf
    • https://cdn.shopify.com/s/files/1/0430/1658/5379/files/78358915740.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_off000052d6.bin
828b092d2179789e3d03804b6925d696cd5019c503a1cdd890c21d2558e74be1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x52D6 5464 bytes
font_01_sfnt_off0000654b.bin
9a9729b196c48f6d6e9c6e55ece93de7e79521b9b43e7ca519fed383768592a9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x654B 10212 bytes

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