Malicious PDF — malware analysis report

Static analysis result for SHA-256 f21825cb0ccdb1af…

MALICIOUS

PDF

44.9 KB Created: 2020-08-06 13:18:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d460a72836797224d456bf36a9c4c013 SHA-1: 3f27af7cd674077d13897bcfc916b4e6f4cbc271 SHA-256: f21825cb0ccdb1af434d6de691f19854d8bf80f69f93ae30710213e883910e18
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a mass external link farm, with one prominent link pointing to a known malicious redirector. The document body, though heavily obfuscated, contains text suggesting an 'agreement form pdf' lure. The primary malicious URL identified is https://ttraff.com/pify?keyword=agreement+form+pdf, which is likely used to redirect the user to a malicious site. The presence of numerous PDF links, many hosted on Shopify, suggests a tactic to obscure the final malicious destination.

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=agreement+form+pdf
    • http://files.wobblyspoon.com/uploads/1/3/1/6/131607544/970118.pdf
    • http://files.quantrylaneart.co.uk/uploads/1/3/1/6/131637108/vibimexupojulepag.pdf
    • http://files.insightdatabasedesign.com/uploads/1/3/1/1/131164456/0bd260e9072.pdf
    • http://files.whitbyanglicans.com/uploads/1/3/2/6/132681080/7198124.pdf
    • https://cdn.shopify.com/s/files/1/0427/5827/5238/files/fixogepu.pdf
    • https://cdn.shopify.com/s/files/1/0430/7379/8306/files/provinsi_bengkulu_dalam_angka_2020.pdf
    • https://cdn.shopify.com/s/files/1/0432/4756/7010/files/blank_nid_card.pdf
    • https://cdn.shopify.com/s/files/1/0429/2739/0887/files/1116227662.pdf
    • https://cdn.shopify.com/s/files/1/0430/3942/4669/files/pabalefu.pdf
    • https://cdn.shopify.com/s/files/1/0431/8419/3697/files/2340662243.pdf
    • https://cdn.shopify.com/s/files/1/0438/3614/5814/files/55700968619.pdf
    • https://cdn.shopify.com/s/files/1/0431/9671/1073/files/37772711515.pdf
    • https://cdn.shopify.com/s/files/1/0429/0609/1673/files/35968772836.pdf
    • https://cdn.shopify.com/s/files/1/0433/4501/9045/files/sbi_credit_card_statement_password.pdf
    • https://cdn.shopify.com/s/files/1/0428/1624/1831/files/missing_persons_ma.pdf
    • https://cdn.shopify.com/s/files/1/0438/1927/0306/files/mutujoganavabi.pdf
    • https://cdn.shopify.com/s/files/1/0432/6958/7104/files/2639461585.pdf
    • https://cdn.shopify.com/s/files/1/0431/2553/8973/files/tuwakuk.pdf
    • https://cdn.shopify.com/s/files/1/0433/6009/2315/files/lone_wolf_gamebooks.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_off000074e5.bin
89ac823c8c4b108477f2bc0dd3c070279862e83eddbd57a2f8e728b4ce1d6a61		 pdf-font-stream PDF embedded font (sfnt) at offset 0x74E5 4932 bytes
font_01_sfnt_off000085a0.bin
4567c57548417b56facc7872182cdcec1e355742061690ec609fcb14fcb16435		 pdf-font-stream PDF embedded font (sfnt) at offset 0x85A0 9672 bytes

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