Malicious PDF — malware analysis report

Static analysis result for SHA-256 25c369ba66504410…

MALICIOUS

PDF

40.7 KB Created: 2020-08-23 18:21:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3806088d02ab5f885458baa3e78c37c6 SHA-1: a8d6defe0010e1ba94bb48ae793449360f8603cd SHA-256: 25c369ba66504410fe75651dd85661d762dd50c9bea64efbc0598d1f30ade286
152 Risk Score

Malware Insights

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

The PDF contains a link that redirects to a known malicious URL, disguised as a cheat for a video game. The PDF also hosts a large number of external links, many pointing to Shopify, suggesting a link farm or redirection strategy. The ML classifier strongly indicated maliciousness, and the embedded URL heuristic confirms the presence of a link within the document body.

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=naruto+shippuden+legends+akatsuki+rising+cheats
    • http://zepelosug.exporttogroup.com/uploads/1/3/0/9/130969465/jubuzajij.pdf
    • https://cdn.shopify.com/s/files/1/0454/2480/3998/files/71377330059.pdf
    • https://cdn.shopify.com/s/files/1/0438/2969/0525/files/cis_new_york_theme_song.pdf
    • https://cdn.shopify.com/s/files/1/0434/8457/7956/files/viwesedokafilesiwuragat.pdf
    • https://cdn.shopify.com/s/files/1/0449/2935/1835/files/chava_kadambari_file_download_in_marathi.pdf
    • https://cdn.shopify.com/s/files/1/0433/1238/2116/files/7156079281.pdf
    • https://cdn.shopify.com/s/files/1/0447/5496/0533/files/jipilowum.pdf
    • https://cdn.shopify.com/s/files/1/0440/5110/3894/files/zumakisizozamozonadoxosi.pdf
    • https://cdn.shopify.com/s/files/1/0427/8213/0332/files/42236883397.pdf
    • https://cdn.shopify.com/s/files/1/0435/1921/3727/files/attach_files_together_online_free.pdf
    • https://cdn.shopify.com/s/files/1/0440/8157/8136/files/volegomapinubepego.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_off00005437.bin
3fa53ced1e2aa7e26cf45880d19abfaa11bb93101471f511e4a9b421f76525aa		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5437 5368 bytes
font_01_sfnt_off00006675.bin
4da7c233bdfdde789c1ef74998057d2909a87abd2c0ff4c66820ff17406f9387		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6675 14596 bytes

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