Malicious PDF — malware analysis report

Static analysis result for SHA-256 a09d148310cb49f8…

MALICIOUS

PDF

39.7 KB Created: 2020-08-28 03:07:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6c50e131b3e4e19e20a194e954eb632c SHA-1: 488f2ddc48d0d699e131f3bf087d53d4d2bb3dea SHA-256: a09d148310cb49f88e25625f8606bddd96c13320f5293ecfd2e9a6b2cca08330
120 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded links, many of which point to a redirector service (ttraff.com) known for malicious activity. The document body, though partially corrupted, contains text related to calculations and references the wkhtmltopdf tool, suggesting it was programmatically generated. The primary attack pattern involves redirecting users to potentially harmful content through a link farm.

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=calcul+d%2527+un+arc+de+cercle
    • http://wegabo.caseworkproductions.com/uploads/1/3/1/6/131606289/ca574f42.pdf
    • http://files.gskmusic.com/uploads/1/3/2/6/132682233/5898838.pdf
    • http://files.cfapar.com/uploads/1/3/0/7/130739754/1609672.pdf
    • http://xepezep.millsriver.org/uploads/1/3/0/8/130813669/junilikanefexom_werifugupudex.pdf
    • https://cdn.shopify.com/s/files/1/0434/4374/9029/files/acet_2019_form.pdf
    • https://cdn.shopify.com/s/files/1/0428/3269/1367/files/miwivolisigipi.pdf
    • https://cdn.shopify.com/s/files/1/0432/2207/3508/files/certificate_of_residence.pdf
    • https://cdn.shopify.com/s/files/1/0435/0119/1328/files/58724457325.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/38970143778.pdf
    • https://cdn.shopify.com/s/files/1/0428/1358/7623/files/79007616959.pdf
    • https://cdn.shopify.com/s/files/1/0430/7573/1616/files/17124750886.pdf
    • https://cdn.shopify.com/s/files/1/0437/1798/4405/files/hk_dass_mathematical_physics_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0430/2975/8103/files/kulakenipofegutaf.pdf
    • https://cdn.shopify.com/s/files/1/0435/5653/6479/files/jatisejixosigipujej.pdf
    • https://cdn.shopify.com/s/files/1/0433/5288/3352/files/fitokakuzabezolomom.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_off00005b0d.bin
86fb50d065abda4507d017557af7f32c6338517c2ea69266c4345588b2803aa6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5B0D 4692 bytes
font_01_sfnt_off00006b08.bin
961353a463998d515863ecc9c0c916a93739c3002f169a2be047d6df166f60b7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6B08 11648 bytes

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