Malicious PDF — malware analysis report

Static analysis result for SHA-256 cfb512e35223eff7…

MALICIOUS

PDF

41.8 KB Created: 2020-09-05 16:45:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 26d33785e4320160070f8362c31c071c SHA-1: 72ab686265f7eb103b0086fef2e43d88b03afda9 SHA-256: cfb512e35223eff70870c6c2172db3380d45035a80bda6873af2b3ed3b64daf5
154 Risk Score

Malware Insights

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

The PDF document contains a link that redirects to a known malicious domain, disguised as interview questions. The PDF_MALICIOUS_REDIRECTOR_LINK heuristic firing confirms this. The ML classifier also strongly indicated maliciousness. The document body, though partially corrupted, contains the text 'Medical sales representative interview questions and answers' and the malicious URL, suggesting a lure to a phishing or malware distribution site.

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=medical+sales+representative+interview+questions+and+answers
    • https://static.usrfiles.com/ugd/585b1d_bc1e47e43503408f899ad8d8095df51c.pdf
    • https://static.usrfiles.com/ugd/2c76f4_590fc2729f044b17b6f28dcd1aee4170.pdf
    • https://static.usrfiles.com/ugd/7baf93_a2f2e961c7984681b0056c31de68c8ea.pdf
    • https://cdn.shopify.com/s/files/1/0437/6847/9906/files/autosketch_9_manual.pdf
    • https://static.usrfiles.com/ugd/76b6de_88160577d20741ac8bdab02ba5eb7fdb.pdf
    • https://static.usrfiles.com/ugd/b8c837_d16ef8f312504022bbf59b0165a9c266.pdf
    • https://static.usrfiles.com/ugd/cc03df_f326b6e5c0c54e0390702c42f1a36034.pdf
    • https://cdn.shopify.com/s/files/1/0430/4253/7629/files/zegibasinigeloxev.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/denikiv.pdf
    • https://cdn.shopify.com/s/files/1/0435/1596/9688/files/vubisijiferawefosoxaxapaz.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_off0000657d.bin
72aa10d3ca2e65239b562c6a9de151851be51537ed360ac9daa29cfd60aa777c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x657D 5352 bytes
font_01_sfnt_off000077db.bin
5625b9c0418e080390310270c76fc552dc8e1c60342118aaa3cb275340021e0c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x77DB 10132 bytes

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