Malicious PDF — malware analysis report

Static analysis result for SHA-256 92c40b930827f804…

MALICIOUS

PDF

33.4 KB Created: 2020-08-17 15:58:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 81d57481967a4f2cee57bfd976fa2b25 SHA-1: d955c34b3d619c3ddb42799dc087a9053e5c33f4 SHA-256: 92c40b930827f8044f3989f3ec7364be78c876678c97bbeadac3f28ccb3e8e9a
120 Risk Score

Malware Insights

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

The PDF file contains numerous embedded links, with one critical heuristic identifying a link to a known malicious redirector infrastructure. The document body, though partially obfuscated, suggests a lure related to an 'answer sheet' for 'DNA, RNA, and snorks'. The primary malicious URL identified is https://ttraff.ru/pify?keyword=dna+rna+and+snorks+answer+sheet, which is likely used to redirect the user to a further malicious destination. The presence of a link farm heuristic further indicates a malicious intent to distribute links.

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.ru/pify?keyword=dna+rna+and+snorks+answer+sheet
    • http://fomamez.rickbirley.com/uploads/1/3/1/6/131636612/924776.pdf
    • http://files.crescentmortgagecompany.com/uploads/1/3/0/7/130739204/sesafutajajalivewok.pdf
    • http://todolido.candacegayle.com/uploads/1/3/1/6/131606552/kurizufovimotajum.pdf
    • http://files.johndileonardo.ca/uploads/1/3/0/7/130775144/1a6ff18b.pdf
    • https://cdn.shopify.com/s/files/1/0437/1428/1625/files/segundo_arco_branquial.pdf
    • https://cdn.shopify.com/s/files/1/0435/5624/1557/files/73060005562.pdf
    • https://cdn.shopify.com/s/files/1/0429/0461/7119/files/skf_double_row_taper_roller_bearing_catalogue.pdf
    • https://cdn.shopify.com/s/files/1/0436/3137/8590/files/69038424817.pdf
    • https://cdn.shopify.com/s/files/1/0432/3917/8399/files/21321991699.pdf
    • https://cdn.shopify.com/s/files/1/0432/2764/4072/files/tudamotunujikemuvixare.pdf
    • https://cdn.shopify.com/s/files/1/0432/2977/3981/files/baguxiwolagoribonap.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/30553092986.pdf
    • https://cdn.shopify.com/s/files/1/0433/7955/6504/files/asperger_english.pdf
    • https://cdn.shopify.com/s/files/1/0430/4296/3613/files/shaft_boring_machine.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_off000046df.bin
1ef2a46c8895ad413065462360cb5ec0c3ff283a4651994dd1de5d2d25057a4c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x46DF 5036 bytes
font_01_sfnt_off00005811.bin
c1749197a24ff73333f884aff6e476885e3650fc97b432427f4ae7583016ab44		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5811 9660 bytes

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