Malicious PDF — malware analysis report

Static analysis result for SHA-256 9ce53e9c10303f49…

MALICIOUS

PDF

37.3 KB Created: 2020-08-29 09:48:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fa5b22c8747905ba5b9a415b0f0237a9 SHA-1: 61ad994d9b61ecb95e076372b693da3996fd8fe2 SHA-256: 9ce53e9c10303f490b5cf8394bf11bb3a9a99963990b790b8736c691c7f3865b
152 Risk Score

Malware Insights

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

The PDF file contains a critical heuristic firing for a malicious redirector link, pointing to 'https://ttraff.club/wix?keyword=%25C3%25A7ikolata+maltipoo+puppies+sat%25C4%25B1l%25C4%25B1k'. This URL is likely part of a phishing or malware distribution chain. The file also exhibits characteristics of a PDF link farm, with numerous embedded URLs, many pointing to 'static.usrfiles.com'. The ML classifier strongly flagged this PDF as malicious. No scripts were extracted, but the presence of the malicious redirector is sufficient evidence for a malicious intent.

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.club/wix?keyword=%25C3%25A7ikolata+maltipoo+puppies+sat%25C4%25B1l%25C4%25B1k
    • https://static.usrfiles.com/ugd/b8c837_778064ffdee04353abbbbfaab9dbc789.pdf
    • https://static.usrfiles.com/ugd/b8c837_500ae9582963451ca9e8e81a37a2abc4.pdf
    • https://static.usrfiles.com/ugd/b8c837_36c073a86cdc4dcfac5bb624d5f7100e.pdf
    • https://static.usrfiles.com/ugd/b8c837_6d928d30a28b4f8c87529791b03cfff4.pdf
    • https://static.usrfiles.com/ugd/b8c837_26397b6645d746d1ac7d26d6c6e962f1.pdf
    • https://static.usrfiles.com/ugd/b8c837_df72b3bb4c3c4817947c2adbad913a96.pdf
    • https://cdn.shopify.com/s/files/1/0437/6962/6781/files/38157025078.pdf
    • https://cdn.shopify.com/s/files/1/0433/3309/1480/files/toroxotokovugorerepa.pdf
    • https://cdn.shopify.com/s/files/1/0432/0319/9138/files/my_inventions_nikola_tesla_espaol.pdf
    • https://static.usrfiles.com/ugd/b8c837_f7e58743c2014c5bae040b09d7186fc7.pdf
    • https://static.usrfiles.com/ugd/b8c837_d4596a7deb9a4e2b80d4de45785102e6.pdf
    • https://static.usrfiles.com/ugd/b8c837_2db59139b67d466e9a131c6c50176046.pdf
    • https://static.usrfiles.com/ugd/b8c837_3df649c4ffdc4755ad0877157f347219.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_off0000524b.bin
8b9205f8f438d123f12419cee08348b7a8f0d7e6b30c26596960503391f8151f
pdf-font-stream PDF embedded font (sfnt) at offset 0x524B 5056 bytes
font_01_sfnt_off00006324.bin
51361e16bf5f9b5cc8076ef10cff2b509a72447b84ef9f080ecf377d3bdf39aa
pdf-font-stream PDF embedded font (sfnt) at offset 0x6324 11288 bytes