Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6f80d153c2ae23d…

MALICIOUS

PDF

66.8 KB Created: 2020-08-10 15:47:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 387a37fb2e364f1e1837404a08564803 SHA-1: acb35e1a779f1c9d707bb302d7b6228c0dbbc549 SHA-256: b6f80d153c2ae23d2a1f456e772c9548742efbf2c5ea78d9311b85fb7ce95ec3
152 Risk Score

Malware Insights

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

The PDF contains embedded links that point to a known malicious redirector infrastructure, specifically 'ttraff.ru'. The document body, though heavily obfuscated, contains the same URL, suggesting a lure to trick users into clicking it. The presence of a large number of external PDF links, many hosted on Shopify, indicates a link farm designed to improve SEO for malicious content. The ML classifier strongly supports the malicious nature of this PDF.

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=alternative+dispute+resolution+techniques+pdf
    • http://xemowidiz.janeteggen.com/uploads/1/3/1/4/131453574/833e8.pdf
    • http://files.bkdoula.com/uploads/1/3/0/8/130874035/305554.pdf
    • http://fubok.stbartswednesbury.com/uploads/1/3/1/1/131164250/lotepig.pdf
    • https://cdn.shopify.com/s/files/1/0429/2273/7830/files/wapavatumijonelegurigutaz.pdf
    • https://cdn.shopify.com/s/files/1/0434/6681/7689/files/32230841590.pdf
    • https://cdn.shopify.com/s/files/1/0435/0862/9663/files/65887888719.pdf
    • https://cdn.shopify.com/s/files/1/0432/7260/1756/files/lulagegibomolevid.pdf
    • https://cdn.shopify.com/s/files/1/0427/5650/5756/files/movobefaziri.pdf
    • https://cdn.shopify.com/s/files/1/0432/9324/5590/files/90253860729.pdf
    • https://cdn.shopify.com/s/files/1/0440/9180/1752/files/egyptian_symbols_and_meanings.pdf
    • https://cdn.shopify.com/s/files/1/0439/4831/0683/files/96382564752.pdf
    • https://cdn.shopify.com/s/files/1/0433/4613/3157/files/maweloxofexewunudetiwof.pdf
    • https://cdn.shopify.com/s/files/1/0432/8734/7360/files/ototoxicidad_por_medicamentos.pdf
    • https://cdn.shopify.com/s/files/1/0434/7727/0692/files/bitaguz.pdf
    • https://cdn.shopify.com/s/files/1/0431/7921/2959/files/my_business_verizon.pdf
    • https://cdn.shopify.com/s/files/1/0430/0328/1571/files/xonolugokagojoj.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_off0000c764.bin
1640a650615140fcded3f24c6f0a25bebc8afbf375285d8290c125bc5603f611
pdf-font-stream PDF embedded font (sfnt) at offset 0xC764 5416 bytes
font_01_sfnt_off0000d9c9.bin
3db2a462676c3566e259e5ee8bf32f554585109fa16aec06344525ccf292fc04
pdf-font-stream PDF embedded font (sfnt) at offset 0xD9C9 10456 bytes