Malicious PDF — malware analysis report

Static analysis result for SHA-256 3bc596e763b161e2…

MALICIOUS

PDF

49.6 KB Created: 2020-07-26 18:45:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 099bb965e227e5619950e0ebcaec9bb3 SHA-1: b527534c15ef331ad083d6415f4824cf9c13abac SHA-256: 3bc596e763b161e2e4b843d75636dcd18b0473bb84a9e6467c15424680a442e8
152 Risk Score

Malware Insights

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

The PDF contains a link farm with numerous embedded URLs, including a redirector to a known malicious domain. The ML classifier strongly indicates maliciousness. The document body, though heavily obfuscated, contains text related to 'Bachelor party malayalam movie mp4', likely a lure. The primary attack pattern involves redirecting users to malicious sites via the link farm.

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=bachelor+party+malayalam+movie++mp4
    • http://files.groveparkstudents.com/uploads/1/3/0/9/130969580/5091743.pdf
    • http://files.clairehedden.com/uploads/1/3/0/9/130969800/9225637.pdf
    • http://files.lapetitepearls.com/uploads/1/3/1/3/131384070/cdfb9774f4c.pdf
    • http://files.lapetitepearls.com/uploads/1/3/1/3/131384070/cdfb
    • https://cdn.shopify.com/s/files/1/0435/0767/9387/files/xatidaturaratexakolub.pdf
    • https://cdn.shopify.com/s/files/1/0439/5961/5646/files/lanitunopelodiviladuvuk.pdf
    • https://cdn.shopify.com/s/files/1/0430/6790/0058/files/xofuro.pdf
    • https://cdn.shopify.com/s/files/1/0430/0016/8597/files/65117512412.pdf
    • https://cdn.shopify.com/s/files/1/0427/5198/3772/files/pekigejaxotegukokakoli.pdf
    • https://cdn.shopify.com/s/files/1/0433/9679/2478/files/givetumemedidizojoka.pdf
    • https://cdn.shopify.com/s/files/1/0433/1202/1657/files/69971825536.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/nomevorijodasulalo.pdf
    • https://cdn.shopify.com/s/files/1/0429/8807/7209/files/guwepironopixituni.pdf
    • https://cdn.shopify.com/s/files/1/0431/2920/8992/files/10471184478.pdf
    • https://cdn.shopify.com/s/files/1/0427/8275/2935/files/burowipitenal.pdf
    • https://cdn.shopify.com/s/files/1/0434/0868/7269/files/nemabewo.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007292.bin
9f6f3cf8e29eea421e9cc2337ec097b8ae075f6ad2dc3e058c5d1fb906198351		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7292 4976 bytes
font_01_sfnt_off0000837f.bin
f5ac1a4b145446c30665ab7dd40f25bb44bdbdd30a348674e7ab5e9de5954125		 pdf-font-stream PDF embedded font (sfnt) at offset 0x837F 5236 bytes
font_02_sfnt_off000096e0.bin
e8b1685bdbcdf96519d8dba855e4a6b6598849eb64a99c0a27a799c47abc10e2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x96E0 9940 bytes

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