Malicious PDF — malware analysis report

Static analysis result for SHA-256 66e91bc662b5531c…

MALICIOUS

PDF

57.9 KB Created: 2020-07-31 08:07:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e926e7cdec3591667298889618682ef1 SHA-1: a3e22ec9eca326442a331d61cae470980a5aea16 SHA-256: 66e91bc662b5531c47942cdc8c29c0288e453e48c551f6f3769f6aa54dc31b79
194 Risk Score

Malware Insights

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

The PDF contains heuristics indicating it is a malicious redirector and part of an advance-fee scam, luring users with the promise of a free Tamil PDF download. It embeds numerous links, including one to a known malicious redirector infrastructure at 'ttraff.com'. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of an advance-fee scam.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Advance-fee lottery/parcel scam lure high SE_ADVANCE_FEE_SCAM_LURE
    Document contains lottery/beneficiary or prize language together with large-value draft/funds wording and parcel/courier delivery requirements. This is a classic advance-fee fraud document shape.
  • 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=aadu+valarpu+tamil+pdf+free+download
    • http://files.7thgradescienceworld.com/uploads/1/3/0/7/130739750/861732.pdf
    • http://files.loveandorthodontics.com/uploads/1/3/0/7/130740017/zejipater.pdf
    • http://files.clearpointtechdesign.com/uploads/1/3/0/7/130775191/2463142.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://fedorahosted.org/lohit
    • https://cdn.shopify.com/s/files/1/0430/5934/7618/files/wenotapujunukezewav.pdf
    • https://cdn.shopify.com/s/files/1/0432/5045/0600/files/29191226197.pdf
    • https://cdn.shopify.com/s/files/1/0433/2588/2520/files/11842394166.pdf
    • https://cdn.shopify.com/s/files/1/0430/2772/6489/files/8967212484.pdf
    • https://cdn.shopify.com/s/files/1/0439/1400/2587/files/11174691023.pdf
    • https://cdn.shopify.com/s/files/1/0437/7811/3697/files/16474771481.pdf
    • https://cdn.shopify.com/s/files/1/0430/3601/6803/files/1566407847.pdf
    • https://cdn.shopify.com/s/files/1/0435/2252/3288/files/84896791356.pdf
    • https://cdn.shopify.com/s/files/1/0437/2014/7095/files/kaman.pdf
    • https://cdn.shopify.com/s/files/1/0429/0327/3628/files/fonow.pdf
    • https://cdn.shopify.com/s/files/1/0431/9353/2573/files/91613587823.pdf
    • https://cdn.shopify.com/s/files/1/0436/3137/8592/files/7947699526.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007890.bin
961b7a943955b488a2179239e816da09e2cbe3fcfe73e7040c6836f7d9e25af2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7890 5032 bytes
font_01_sfnt_off000089a9.bin
950d8db4fe73fac059d99caeecc7a6e966c14a44911b076c53cac40434679c88		 pdf-font-stream PDF embedded font (sfnt) at offset 0x89A9 13576 bytes
font_02_sfnt_off0000abb3.bin
0c998621ce2a857a9305ab771d1c5afa90daed6d4176272e421d290c7406474a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xABB3 14564 bytes

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