Malicious PDF — malware analysis report

Static analysis result for SHA-256 a89deeff23aed8d9…

MALICIOUS

PDF

48.0 KB Created: 2020-08-19 01:33:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 34ecc3e0b56acd960e1f120d4dc2e345 SHA-1: b1c4d3bdf765deb090d4b024cdea6334f5e4a3c1 SHA-256: a89deeff23aed8d93638b39e080ee27f7085cdf2ffc5d029003095b73e0dc2db
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to a redirector service (ttraff.ru) known for malicious activity. The document body, though heavily obfuscated, contains a URL that appears to be part of this link farm. The ML classifier strongly indicates maliciousness, and the PDF structure suggests a deliberate attempt to create a link farm for SEO poisoning or to distribute malware.

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.ru/pify?keyword=antonyms+worksheets+pdf+grade+1
    • http://files.katiemachain.com/uploads/1/3/1/4/131455283/57a787ca629.pdf
    • http://bunedijej.ellipseatlantic.com/uploads/1/3/1/3/131381135/7ab858ff.pdf
    • https://cdn.shopify.com/s/files/1/0430/0003/7527/files/10735721990.pdf
    • https://cdn.shopify.com/s/files/1/0431/6397/5835/files/baredufu.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/25843483079.pdf
    • https://cdn.shopify.com/s/files/1/0429/2640/7833/files/the_crafting_dead_mod_1._7._10.pdf
    • https://cdn.shopify.com/s/files/1/0441/0382/7608/files/36129430558.pdf
    • https://cdn.shopify.com/s/files/1/0431/1564/3031/files/kixurigejatidir.pdf
    • https://cdn.shopify.com/s/files/1/0430/5240/0789/files/xisufidozikeru.pdf
    • https://cdn.shopify.com/s/files/1/0434/6000/1957/files/balixumolobu.pdf
    • https://cdn.shopify.com/s/files/1/0432/5897/0280/files/76866561448.pdf
    • https://cdn.shopify.com/s/files/1/0434/3519/6568/files/baofeng_uv-_5r_manual_espaol.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/rerotapok.pdf
    • https://cdn.shopify.com/s/files/1/0435/5801/1035/files/93106350896.pdf
    • https://cdn.shopify.com/s/files/1/0429/7709/9939/files/jetalupokefegenovu.pdf
    • https://cdn.shopify.com/s/files/1/0430/9463/8749/files/dunaros.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_off00006e4b.bin
87999caefb3cdef06a2aaf36633fec46b5bbdeffa224b4492d6b49cef82b6c28		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6E4B 5464 bytes
font_01_sfnt_off000080ca.bin
afcca22473adea1980c55f0a8396dc8d73e76d293ec1734bdd76966da7b29636		 pdf-font-stream PDF embedded font (sfnt) at offset 0x80CA 10596 bytes
font_02_sfnt_off0000a4de.bin
4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA4DE 4324 bytes

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