Malicious PDF — malware analysis report

Static analysis result for SHA-256 4081fcda402b287d…

MALICIOUS

PDF

44.7 KB Created: 2020-08-06 12:56:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d5d23d4a621095667b1f164d8d1fb8f8 SHA-1: 12664fec20b50856e681d813c6ce3c4cf7d60ac8 SHA-256: 4081fcda402b287d943af2fdefc0845cf742b2ca363fe2c2736b508d32370a38
152 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous external PDFs, with the primary link redirecting to known malicious infrastructure at 'ttraff.cc'. The ML classifier strongly indicated maliciousness. The document body, though heavily obfuscated, contains the primary malicious URL, suggesting the document's purpose is to drive traffic to this redirector.

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.cc/pify?keyword=borax+bead+test+pdf
    • http://files.ncscja.org/uploads/1/3/2/6/132681560/xesavuweso.pdf
    • http://files.chandao.co.uk/uploads/1/3/1/8/131872055/426918.pdf
    • http://files.shinefromwithinconsulting.com/uploads/1/3/0/8/130813898/baad17e6f4.pdf
    • https://cdn.shopify.com/s/files/1/0440/1351/9006/files/lajof.pdf
    • https://cdn.shopify.com/s/files/1/0439/4106/8958/files/wofuwijaku.pdf
    • https://cdn.shopify.com/s/files/1/0428/8797/0975/files/73788057590.pdf
    • https://cdn.shopify.com/s/files/1/0432/7525/5961/files/37036549204.pdf
    • https://cdn.shopify.com/s/files/1/0431/6708/8791/files/digestion_de_carbohidratos_lipidos_y_proteinas.pdf
    • https://cdn.shopify.com/s/files/1/0431/7279/0428/files/73086896008.pdf
    • https://cdn.shopify.com/s/files/1/0430/6891/5863/files/gebazizusomutisud.pdf
    • https://cdn.shopify.com/s/files/1/0434/8693/7253/files/52889541926.pdf
    • https://cdn.shopify.com/s/files/1/0431/3687/6695/files/halimbawa_ng_action_plan_sa_filipino.pdf
    • https://cdn.shopify.com/s/files/1/0427/7141/5196/files/77980744583.pdf
    • https://cdn.shopify.com/s/files/1/0432/1571/6513/files/animal_farm_novel.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/
    • https://cdn.shopify.com/s/files/1/0431/7279/0428/files/7

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000062b7.bin
9c4e9a61a6b61973c4d5f76d5802dd50b6239ba28933ca9e8541f2d9bdde1ba5
pdf-font-stream PDF embedded font (sfnt) at offset 0x62B7 4896 bytes
font_01_sfnt_off00007365.bin
5c0aadc4823b35c2d37dd7c853d24b291f68653ef7af8ca8430c2ce58526362a
pdf-font-stream PDF embedded font (sfnt) at offset 0x7365 10564 bytes
font_02_sfnt_off00009779.bin
cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34
pdf-font-stream PDF embedded font (sfnt) at offset 0x9779 4324 bytes