Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d6406008fd8cd91…

MALICIOUS

PDF

34.7 KB Created: 2020-08-18 23:39:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b4c1229f21752b75d5ea228ea65f09a5 SHA-1: 5920ac2bb2f8c091cfeafa915d61ada998886d2b SHA-256: 8d6406008fd8cd91246f6279f131616654b8f0b8f2423d9f0bab5bf65733ec84
150 Risk Score

Malware Insights

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

The PDF contains a deceptive title and body text related to 'graphing rational functions practice answers' to mask its malicious intent. It embeds a link to a known malicious redirector, ttraff.com, which likely serves as a gateway to further malicious content. The presence of numerous other PDF links, many hosted on Shopify, suggests a link farm or SEO poisoning tactic to distribute the malicious PDF. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • 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.
  • 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=graphing+rational+functions+practice+answers
    • http://files.darkersmathhub.com/uploads/1/3/0/9/130969879/be722e4.pdf
    • http://wenomen.neverstripaflooragain.com/uploads/1/3/0/7/130739086/1146b435a59be12.pdf
    • https://cdn.shopify.com/s/files/1/0443/3005/7884/files/causas_del_alcoholismo_en_la_adolescencia.pdf
    • https://cdn.shopify.com/s/files/1/0431/5843/8037/files/betigimebozomakalojusafoj.pdf
    • https://cdn.shopify.com/s/files/1/0433/4488/7963/files/vumomitoxilurovu.pdf
    • https://cdn.shopify.com/s/files/1/0427/3415/7991/files/xanaluvavugosovaf.pdf
    • https://cdn.shopify.com/s/files/1/0433/2647/2347/files/daxijugoj.pdf
    • https://cdn.shopify.com/s/files/1/0431/8140/8420/files/petenivovinadivi.pdf
    • https://cdn.shopify.com/s/files/1/0433/0071/6694/files/87676305369.pdf
    • https://cdn.shopify.com/s/files/1/0447/5827/0101/files/age_problems_aptitude_shortcuts.pdf
    • https://cdn.shopify.com/s/files/1/0434/0737/6534/files/beheading_tinkers_construct.pdf
    • https://cdn.shopify.com/s/files/1/0430/1615/9395/files/todelabedaxebagajeja.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/kemulubu.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000049e8.bin
6ff58037048f28841d6905e32cd8790397ef9fd6cbd3b2c28f7873859daa0cee		 pdf-font-stream PDF embedded font (sfnt) at offset 0x49E8 5400 bytes
font_01_sfnt_off00005c59.bin
e88972866c73b88124596d9886aca0381eebce8cd085449062b0627bed599970		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5C59 9844 bytes

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