Malicious PDF — malware analysis report

Static analysis result for SHA-256 f2dae7486bfc0cf6…

MALICIOUS

PDF

38.6 KB Created: 2020-08-15 08:19:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2782fcf9bf318554a39a444ee13855af SHA-1: 9d69cbe614ad883dafbf53d5a6793e1eccaf43be SHA-256: f2dae7486bfc0cf61cbdbe81948015c03ba8f788d8d00d118e08c88f5a647d2e
154 Risk Score

Malware Insights

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

The PDF contains a significant number of embedded links, many of which point to external resources. One critical heuristic identified a malicious redirector link, and another flagged the document as a link farm. The ML classifier also strongly indicated maliciousness. The primary attack pattern involves directing users to potentially harmful websites through these embedded links.

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=bubble+sheet+mask+korean
    • http://vomoz.idzubaharin.com/uploads/1/3/1/4/131482853/petusisa.pdf
    • http://files.coalitionoffamilies.org/uploads/1/3/0/8/130874569/5197640.pdf
    • https://cdn.shopify.com/s/files/1/0437/8958/2487/files/best_video_downloader_chrome.pdf
    • https://cdn.shopify.com/s/files/1/0437/8984/4631/files/xinugoki.pdf
    • https://cdn.shopify.com/s/files/1/0430/4837/0333/files/xuxedozaza.pdf
    • https://cdn.shopify.com/s/files/1/0432/9173/8277/files/58012258127.pdf
    • https://cdn.shopify.com/s/files/1/0432/4094/7880/files/wefimurobekojevilugagakit.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/noviwuvado.pdf
    • https://cdn.shopify.com/s/files/1/0432/8158/0200/files/falekadubogegosezeten.pdf
    • https://cdn.shopify.com/s/files/1/0430/6114/9850/files/xetavalexubibelamotozuvoz.pdf
    • https://cdn.shopify.com/s/files/1/0434/3139/5478/files/41954056557.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/lavatorumagenikezelun.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_off000059f7.bin
b51cb3ed4b8cb5a53ee4bf208da4b64192c57618dc965320e006dab11ff0fbc5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x59F7 5180 bytes
font_01_sfnt_off00006b68.bin
5d9bbe08fdf3368699ff0968dcfa282d6577b6c4c70c7472de108a779bc2d436		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6B68 10140 bytes

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