Malicious PDF — malware analysis report

Static analysis result for SHA-256 94ff12aa87602f22…

MALICIOUS

PDF

62.4 KB Created: 2020-08-13 17:19:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 20fcbda832eb3278a54cf58d29c94eab SHA-1: 912de6fe612d5e3f61e81c6c93904e78a497e29a SHA-256: 94ff12aa87602f227b50a526f532056744ca6a52a944d711188296044f8b053a
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains a high number of embedded links, many of which point to a link farm hosted on Shopify, designed to obscure the ultimate destination. One critical heuristic identified a link to known malicious redirector infrastructure at 'ttraff.com'. The ML classifier strongly indicated maliciousness. No scripts were extracted, but the primary attack pattern involves luring users through a deceptive 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.com/wb?keyword=wave%20propagation%20pdf
    • http://files.miamicountyhomeshow.com/uploads/1/3/0/8/130814169/29595e293aeb2.pdf
    • http://zamijefej.nbbcob.com/uploads/1/3/2/7/132710657/dc77bacb3.pdf
    • http://files.natureimprintedphotography.com/uploads/1/3/1/4/131438427/52b4869a85f27ae.pdf
    • http://files.bikewritingbuilder.com/uploads/1/3/2/6/132695492/2716741.pdf
    • http://files.wroughtbylight.com/uploads/1/3/1/3/131380953/1537795.pdf
    • https://cdn.shopify.com/s/files/1/0429/9328/7331/files/3800228506.pdf
    • https://cdn.shopify.com/s/files/1/0431/5850/3573/files/dizutolezuniwakez.pdf
    • https://cdn.shopify.com/s/files/1/0437/8260/2904/files/jakexekavagowufor.pdf
    • https://cdn.shopify.com/s/files/1/0431/5011/4978/files/nuxojekafoz.pdf
    • https://cdn.shopify.com/s/files/1/0432/9409/7576/files/detail_fosse_septique.pdf
    • https://cdn.shopify.com/s/files/1/0431/2216/3878/files/21431856685.pdf
    • https://cdn.shopify.com/s/files/1/0448/2924/5600/files/miwinomasifirijaremexis.pdf
    • https://cdn.shopify.com/s/files/1/0435/4146/3189/files/67132604799.pdf
    • https://cdn.shopify.com/s/files/1/0429/3243/7158/files/zudegari.pdf
    • https://cdn.shopify.com/s/files/1/0431/6640/0673/files/88057881702.pdf
    • https://cdn.shopify.com/s/files/1/0439/9448/0798/files/31070170538.pdf
    • https://cdn.shopify.com/s/files/1/0428/9229/6359/files/nvidia_high_definition_audio_driver.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_off00009a8e.bin
abf55c706e9812ab9de95854c4d513962668484d81a0df752f9f33bfdac2c133		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9A8E 5072 bytes
font_01_sfnt_off0000abf5.bin
3e636660399aea033d4f80aa70ed8495117c96fb907ff028ee77f482907f01d2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xABF5 12872 bytes
font_02_sfnt_off0000d7d4.bin
bc702d6a414208b2943ca7457a4ac37580cd799b08f751d967fd5acf5b657e5d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD7D4 16080 bytes

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