Malicious PDF — malware analysis report

Static analysis result for SHA-256 f2b57d2a6df873b7…

MALICIOUS

PDF

51.8 KB Created: 2020-08-31 02:03:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 20c59cc754b177cae6493983592db03f SHA-1: 0bd3c948212fa53e8917a009d61360a5bee35dd0 SHA-256: f2b57d2a6df873b7d24c0c7214e834beaac45a8c4a6d905fe50e135fa811084d
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a heuristic firing for a malicious redirector link, pointing to 'https://ttraff.ru/wix?keyword=diccionario+de+espa%25C3%25B1ol+significados+pdf'. Additionally, it exhibits characteristics of a PDF link farm, with numerous embedded links to 'static.usrfiles.com'. The document body, though partially corrupted, contains the same keywords as the malicious URL, suggesting a lure to disguise malicious activity. The ML classifier strongly indicates maliciousness.

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/wix?keyword=diccionario+de+espa%25C3%25B1ol+significados+pdf
    • https://static.usrfiles.com/ugd/a771bd_ca10a76c9fae489ca0c11c09f1a396cb.pdf
    • https://static.usrfiles.com/ugd/769f78_3921ec77d0514d278539cddd1817d0d6.pdf
    • https://static.usrfiles.com/ugd/e3ed1f_42567d8b5ccb476baaa6fcf56670eaa9.pdf
    • https://static.usrfiles.com/ugd/7c3584_36e00b04b2324119909854f1ebdf1ded.pdf
    • https://static.usrfiles.com/ugd/f967ac_e52b59529be24a6db5c0a9e9cd8a75e8.pdf
    • https://static.usrfiles.com/ugd/b8c837_cc105667636b409cac439df943fa0c99.pdf
    • https://static.usrfiles.com/ugd/b8c837_5ad9b255d5cf4ba5b5ac3a68487226bd.pdf
    • https://static.usrfiles.com/ugd/33a2e4_7ff26f2aec5640f6a6ec44d26818e4d2.pdf
    • https://static.usrfiles.com/ugd/c0b427_6afeea2cd58d45f39999fe72831312cc.pdf
    • https://static.usrfiles.com/ugd/2813e2_dc0f867c179744519428d1d2e4b8f371.pdf
    • https://static.usrfiles.com/ugd/b8c837_efc6fe953ec6424396a962789aae88c5.pdf
    • https://static.usrfiles.com/ugd/eda9ba_8d44336ea78f4b229ac38d9e310cc853.pdf
    • https://static.usrfiles.com/ugd/3e0cb9_eaf6c44776214fc891100beb3f196bc7.pdf
    • https://static.usrfiles.com/ugd/b8c837_e39f5220c022485ba0e63cdb5461b43d.pdf
    • https://static.usrfiles.com/ugd/b8c837_4373865ff713443e9c4123674c41c7e9.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007077.bin
eea21cf0ff651e3387d57c1995773ccc04c071ae5c518ef6bf7a08488aab51ee		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7077 5536 bytes
font_01_sfnt_off00008301.bin
17250a575f477041488506d322f5c820d7db7e4a37e5ce35ed1eb5fcd3464164		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8301 7704 bytes
font_02_sfnt_off00009833.bin
751b2f3576e56f465a77dc8ef556a48e733caa903935ed5a1fabf3f012600e2b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9833 12384 bytes

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