Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c13de8912f67221…

MALICIOUS

PDF

44.3 KB Created: 2020-09-07 01:07:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e4c22bc3e1b069674d4aec7cc954881b SHA-1: 289b8fc841686271ae1e5a4e8e31163398eaaeea SHA-256: 4c13de8912f67221e5966fe14bba14ccd37706dd03a809f7ad73ba014094253c
94 Risk Score

Malware Insights

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

The PDF contains a malicious redirector link that points to 'https://ttraff.club/wix?keyword=accounting+principles+volume+1+8th+edition+pdf'. This link is disguised with text related to accounting principles to entice users to click. The ML classifier also strongly flagged this PDF as malicious. No scripts were extracted, but the primary attack vector appears to be social engineering via a malicious link.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • 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.
  • 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.club/wix?keyword=accounting+principles+volume+1+8th+edition+pdf
    • https://cdn.shopify.com/s/files/1/0430/4420/8789/files/nulofirenupigawekuxasogi.pdf
    • https://cdn.shopify.com/s/files/1/0431/1855/9393/files/44418093024.pdf
    • https://cdn.shopify.com/s/files/1/0438/1668/1629/files/98481626838.pdf
    • https://cdn.shopify.com/s/files/1/0431/6066/6274/files/rinumikijavevexizuxofemer.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/47184882359.pdf
    • https://cdn.shopify.com/s/files/1/0429/7474/0636/files/siwupotid.pdf
    • https://cdn.shopify.com/s/files/1/0439/4686/8891/files/lucida_calligraphy_ttf_free.pdf
    • https://static.usrfiles.com/ugd/c8683e_0171c78705174f5186129f6cb594c551.pdf
    • https://static.usrfiles.com/ugd/64d889_f744d09d7026417abb57123771cf0606.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_off000062c8.bin
2eed7b65a6cabd334eb99a3448d4f5881934389576bf2622765571874bcb04c4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x62C8 5652 bytes
font_01_sfnt_off000075f3.bin
cfd0c73bca46c2faf33c92c58fb11a760490335aa0ee8d4c942b9939002ba8cf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x75F3 14916 bytes

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