Malicious PDF — malware analysis report

Static analysis result for SHA-256 d1397bd40772eccc…

MALICIOUS

PDF

52.6 KB Created: 2020-07-31 04:56:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 35cb6d81961bb9afc4d64c7dda2ed622 SHA-1: a424e239a8efaaf9c301a1589c9588657f46d7b6 SHA-256: d1397bd40772eccc382524c097f19dcf00269fba77e2699691847463defa772c
152 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, with one critical heuristic identifying a link to a known malicious redirector. The document body, though heavily obfuscated, suggests a lure related to 'reading pdf'. The presence of multiple embedded URLs, including one pointing to a redirector, indicates an attempt to direct users to potentially harmful content. The ML classifier also strongly flagged this PDF as malicious.

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=yaseen+malayalam+reading+pdf
    • http://files.teninabedtheatre.com/uploads/1/3/0/8/130813799/tinidu.pdf
    • http://files.brandonbarrowscomics.com/uploads/1/3/1/3/131383398/laxowitupizovexuw.pdf
    • http://files.dst-transport.com/uploads/1/3/0/8/130874162/malijavigafop.pdf
    • http://files.dst-transport.com/uploads/1/3/0/8/130874162/malijavig
    • https://cdn.shopify.com/s/files/1/0428/0313/4627/files/48448280768.pdf
    • https://cdn.shopify.com/s/files/1/0434/2090/9718/files/92767381277.pdf
    • https://cdn.shopify.com/s/files/1/0434/3015/0300/files/20044825771.pdf
    • https://cdn.shopify.com/s/files/1/0434/9083/6632/files/bexazobigidadusupoj.pdf
    • https://cdn.shopify.com/s/files/1/0434/4456/8216/files/vumusawisoxodidujusavejo.pdf
    • https://cdn.shopify.com/s/files/1/0431/5440/7580/files/92812663347.pdf
    • https://cdn.shopify.com/s/files/1/0433/9341/7366/files/88151932711.pdf
    • https://cdn.shopify.com/s/files/1/0439/8222/5566/files/54337095939.pdf
    • https://cdn.shopify.com/s/files/1/0433/6222/2232/files/93152491650.pdf
    • https://cdn.shopify.com/s/files/1/0434/0921/1559/files/12694311288.pdf
    • https://cdn.shopify.com/s/files/1/0432/5690/5885/files/poxaxevipafixekimuvixole.pdf
    • https://cdn.shopify.com/s/files/1/0441/1306/8184/files/64419552541.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_off000079e7.bin
b5a5700630b79e6f2f8b9da2e4658893ee9da8178767e272bd1267142664d083		 pdf-font-stream PDF embedded font (sfnt) at offset 0x79E7 5024 bytes
font_01_sfnt_off00008ad6.bin
4f4d6108f466e124e4e98f9fdfcef8e93141effaac2142b302291d6165bc0cf9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8AD6 10780 bytes
font_02_sfnt_off0000af2b.bin
7799cc578944ea27f776c148d498a23748daee036f64c0e32fe755f03f097aa6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAF2B 16324 bytes

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