Malicious PDF — malware analysis report

Static analysis result for SHA-256 169683f4ac2d7784…

MALICIOUS

PDF

46.6 KB Created: 2020-07-29 15:18:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7a5c738f944cdf7468962d53e8bfcaad SHA-1: e02b0a8050b0be760eacd4f4e0f842ca1ea0383b SHA-256: 169683f4ac2d778412f0e8e0186ad0915208c17e96c29efdfc0c8d494f832b36
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a link to a known malicious redirector, ttraff.ru, disguised as a document about 'CE certification standards'. This suggests a phishing or scam attempt. The PDF also hosts a large number of external links, many pointing to Shopify, which is unusual and likely part of a link farm to improve SEO for malicious content. No scripts were extracted, but the presence of a malicious redirector and the link farm strongly indicate a malicious intent.

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=ce+certification+standards+pdf
    • http://files.jimdarow.com/uploads/1/3/1/8/131856655/wivegaradifugagub.pdf
    • http://files.shockentertainmentinc.com/uploads/1/3/1/8/131871994/1971917.pdf
    • http://files.stpetersnsdunboyne.com/uploads/1/3/1/1/131164479/zovesasegorejumajeke.pdf
    • http://files.fbtvmin.net/uploads/1/3/2/3/132302710/nutivanugejeruwota.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0430/6799/8362/files/34007983127.pdf
    • https://cdn.shopify.com/s/files/1/0427/9471/3244/files/bapivadubulu.pdf
    • https://cdn.shopify.com/s/files/1/0439/3258/2056/files/45075271756.pdf
    • https://cdn.shopify.com/s/files/1/0434/3575/3639/files/70922692637.pdf
    • https://cdn.shopify.com/s/files/1/0430/3667/2162/files/pejeboxusivuxurexaxexunok.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/bewewolifokolugetu.pdf
    • https://cdn.shopify.com/s/files/1/0433/9043/5495/files/zokedixuz.pdf
    • https://cdn.shopify.com/s/files/1/0428/7427/3948/files/24828128558.pdf
    • https://cdn.shopify.com/s/files/1/0440/5932/8662/files/10283601675.pdf
    • https://cdn.shopify.com/s/files/1/0434/0239/5798/files/kabozu.pdf
    • https://cdn.shopify.com/s/files/1/0430/9906/2426/files/dafosivug.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/41877136991.pdf
    • https://cdn.shopify.com/s/files/1/0435/4434/6792/files/tinuxafafiporafapoxikez.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_off0000783b.bin
6bd2e980d40a0c640ec8c05099f3315d0efdab97cdcc42980ff3efdd71742510		 pdf-font-stream PDF embedded font (sfnt) at offset 0x783B 4928 bytes
font_01_sfnt_off000088ff.bin
0b493c25d113d7d15208620299fdfd1a8f9037be6d5aec70b3c0963005c22c69		 pdf-font-stream PDF embedded font (sfnt) at offset 0x88FF 10412 bytes

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