Malicious PDF — malware analysis report

Static analysis result for SHA-256 a231e1561f3faecd…

MALICIOUS

PDF

48.5 KB Created: 2020-08-03 07:38:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 194767078ab435f704cfbbb646d36b10 SHA-1: 661aa72945570d0279a7ad8da13e1cbc90881656 SHA-256: a231e1561f3faecd6621ddbfab92c96b1b91d695156f2b6328c988c89e28d3dd
152 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'ttraff.com'. Additionally, it exhibits characteristics of a PDF link farm, with numerous embedded URLs, many of which are hosted on Shopify but lead to potentially malicious content. The ML classifier strongly supports the malicious verdict. The document body, though heavily obfuscated, contains the malicious URL, suggesting an attempt to trick users into clicking it for a walkthrough, which then redirects to a malicious site.

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/pify?keyword=fire+emblem+path+of+radiance+walkthrough
    • http://files.kristenwambach.com/uploads/1/3/0/8/130813550/10db9b279740941.pdf
    • http://files.creativeassociationservices.com/uploads/1/3/1/8/131871984/9376297.pdf
    • http://files.unbridleddesignz.com/uploads/1/3/1/6/131637553/nenopixalepeti.pdf
    • http://files.stevensonpto.com/uploads/1/3/0/7/130776327/logobov.pdf
    • https://cdn.shopify.com/s/files/1/0429/1156/3932/files/acs_chemistry_exam_study_guide.pdf
    • https://cdn.shopify.com/s/files/1/0434/6131/2676/files/donabifadivifesidiwexije.pdf
    • https://cdn.shopify.com/s/files/1/0439/3716/9576/files/taletes.pdf
    • https://cdn.shopify.com/s/files/1/0437/2309/6216/files/pibabazoniwobawapubililiz.pdf
    • https://cdn.shopify.com/s/files/1/0435/9097/5647/files/kegowijisezopupo.pdf
    • https://cdn.shopify.com/s/files/1/0431/4392/1820/files/45517044450.pdf
    • https://cdn.shopify.com/s/files/1/0431/6200/9755/files/12795103948.pdf
    • https://cdn.shopify.com/s/files/1/0434/6786/6265/files/63181853299.pdf
    • https://cdn.shopify.com/s/files/1/0430/9021/5073/files/17505293156.pdf
    • https://cdn.shopify.com/s/files/1/0428/9291/8947/files/lomulimujejikagitud.pdf
    • https://cdn.shopify.com/s/files/1/0438/0013/3793/files/.pdf
    • https://cdn.shopify.com/s/files/1/0433/6346/7414/files/gosekonifopasidu.pdf
    • https://cdn.shopify.com/s/files/1/0437/2388/2664/files/25078900238.pdf
    • https://cdn.shopify.com/s/files/1/0432/2469/4942/files/fisipafidizitufutulanovu.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_off00006cd7.bin
35d4917e7aa613ff19e3fa7b1ca4c4cf194105103a722759cd177b5b0044a8b9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6CD7 5324 bytes
font_01_sfnt_off00007f41.bin
e05ade8168169e0dd1985da63b7ca85875413409a262266f4a891fcfaa2ca283		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7F41 5640 bytes
font_02_sfnt_off0000925c.bin
712eade2a95d4083e22fb3985ab50a6e209333d76786110a9d2df36d11815560		 pdf-font-stream PDF embedded font (sfnt) at offset 0x925C 9812 bytes

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