Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca596361d22b2102…

MALICIOUS

PDF

59.8 KB Created: 2020-08-30 22:40:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c4c7ba5a2080d63e45046b99d4e5e53c SHA-1: 621b56800f6fa53ff22ab27dde1f8a1d8920bc79 SHA-256: ca596361d22b2102199c59c232321182cf7ed1b86b76fd0a098502128c869516
152 Risk Score

Malware Insights

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

The PDF contains a link farm and a critical heuristic firing for a malicious redirector. The embedded URL points to 'ttraff.com', which is known for malicious redirects. The document body, though heavily obfuscated, contains the same URL, suggesting a lure to trick users into clicking on malicious links. The ML classifier also strongly indicated maliciousness.

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/wix?keyword=genetics+practice+1+basic+genetics
    • https://cdn.shopify.com/s/files/1/0435/4169/2570/files/tebafopesomu.pdf
    • https://cdn.shopify.com/s/files/1/0428/1312/8867/files/56303023705.pdf
    • https://cdn.shopify.com/s/files/1/0441/4432/8856/files/biwilabukobegin.pdf
    • https://static.usrfiles.com/ugd/0e2875_d74dd6c253ec4537be9a1fce9ee8eb7d.pdf
    • https://static.usrfiles.com/ugd/756799_92404ba79c214228bcece89b9151edcb.pdf
    • https://cdn.shopify.com/s/files/1/0437/8699/3816/files/ropovobose.pdf
    • https://cdn.shopify.com/s/files/1/0431/6174/7620/files/manualidades_de_papel_reciclado_para_navidad.pdf
    • https://cdn.shopify.com/s/files/1/0430/4509/3533/files/35415996766.pdf
    • https://cdn.shopify.com/s/files/1/0428/6460/7398/files/xunorabifudupolofivilega.pdf
    • https://cdn.shopify.com/s/files/1/0429/5163/9196/files/45782166227.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/68905528383.pdf
    • https://cdn.shopify.com/s/files/1/0435/1157/8776/files/8701128634.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_off0000a749.bin
643a009cf10b355c934184458fb69a6b9882cb4ae7e442c74d9c52356824cd63		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA749 5292 bytes
font_01_sfnt_off0000b962.bin
d5f3189192e338c00d61ed652d84d12c8518477ede04fb20e722396cfe111720		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB962 12504 bytes

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