Malicious PDF — malware analysis report

Static analysis result for SHA-256 e3e28340c1f0c1cc…

MALICIOUS

PDF

40.1 KB Created: 2020-08-15 03:17:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ace12ff4fe856c0210e628445fee20c0 SHA-1: 6d1505010feede286712fc83a08551058255205a SHA-256: e3e28340c1f0c1cc06989caef1804376c5155bcc75b046f2d79402bc5e676a6a
150 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains numerous embedded links, with a critical heuristic identifying a malicious redirector at 'https://ttraff.ru/pify?keyword=past+simple+regular+verbs+questions+pdf'. The document body, though heavily obfuscated, also contains this URL and other Shopify links, suggesting a link farm or SEO poisoning tactic to distribute malicious content. The ML classifier strongly supports the malicious verdict.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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=past+simple+regular+verbs+questions+pdf
    • http://files.tell-talepublishing.com/uploads/1/3/0/8/130873875/sazenazitebek_nisumakeraw_suwudenes_fazujupufijum.pdf
    • https://cdn.shopify.com/s/files/1/0434/0708/1622/files/32676755047.pdf
    • https://cdn.shopify.com/s/files/1/0431/5525/9546/files/38518587855.pdf
    • https://cdn.shopify.com/s/files/1/0447/4558/8887/files/all_technical_drawing_symbols.pdf
    • https://cdn.shopify.com/s/files/1/0434/7445/2632/files/zemawo.pdf
    • https://cdn.shopify.com/s/files/1/0431/9582/6336/files/lekeg.pdf
    • https://cdn.shopify.com/s/files/1/0435/9100/8419/files/tabaguvoneronef.pdf
    • https://cdn.shopify.com/s/files/1/0430/3749/1354/files/latisupul.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_off00005e9b.bin
52bce68d9ca0531aebee9924d438b091bb9977515a9c96a2ca316af3fe4c2a30		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5E9B 5688 bytes
font_01_sfnt_off000071cb.bin
e4a9a1308ac3aed122d4651831f46835951c86636fa0bb8d0fb448aeac16e18e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x71CB 10124 bytes

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