Malicious PDF — malware analysis report

Static analysis result for SHA-256 621a350b6629dc1d…

MALICIOUS

PDF

43.2 KB Created: 2020-07-25 10:29:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8d1dadc6d58e1339778f32c57c8c1b21 SHA-1: eea08f6f4eaa3d77ec99499752fda755d47b5224 SHA-256: 621a350b6629dc1de9695d24dc7be2b4cbb8ef9506bc14c26b224e3e16904d0a
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains a link to a known malicious redirector, ttraff.com, which is designed to lead users to further malicious content. The document also features a large number of external PDF links, suggesting a link farm or SEO manipulation tactic. The presence of a 'download button' lure further supports a malicious intent to trick users into clicking the malicious link.

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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=thyroid+cancer+guidelines+uk
    • http://files.lotusmoda.org/uploads/1/3/0/8/130813320/9486634.pdf
    • http://files.pacificbrows.co.uk/uploads/1/3/1/4/131453448/aa841be36862052.pdf
    • http://files.kathybertone.com/uploads/1/3/1/4/131438541/dujasirowo-roxovafukop-kilamuxenukoloj-zofikaxe.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/4054/6721/files/26796903879.pdf
    • https://cdn.shopify.com/s/files/1/0433/1359/4526/files/93041473572.pdf
    • https://cdn.shopify.com/s/files/1/0432/1522/4996/files/xujutenixe.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/16485275060.pdf
    • https://cdn.shopify.com/s/files/1/0435/7105/2703/files/6239097259.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/30553092986.pdf
    • https://cdn.shopify.com/s/files/1/0434/3359/0940/files/41021910478.pdf
    • https://cdn.shopify.com/s/files/1/0431/1924/7514/files/nobijupezusigawamakexusa.pdf
    • https://cdn.shopify.com/s/files/1/0429/1677/4054/files/kuredesu.pdf
    • https://cdn.shopify.com/s/files/1/0428/5893/8531/files/suvuzivusika.pdf
    • https://cdn.shopify.com/s/files/1/0430/3598/4029/files/mijalafojabibedetajumoj.pdf
    • https://cdn.shopify.com/s/files/1/0430/8759/3632/files/sodosel.pdf
    • https://cdn.shopify.com/s/files/1/0432/0090/5373/files/tavepaxutosevimeji.pdf
    • https://cdn.shopify.com/s/files/1/0429/0487/9271/files/munifemer.pdf
    • https://cdn.shopify.com/s/files/1/0431/3353/4369/files/61956070758.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_off00006bcc.bin
103152aa8ae2d53eab938bde25936da2d77045429a09af76954c995610ae23a8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6BCC 5120 bytes
font_01_sfnt_off00007d27.bin
0a0fa348ad193b82d3b65d69340fb14e2dbf4e2c5a926347a4853ae89ff6f80b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7D27 10184 bytes

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