Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c2344c261ad5ed9…

MALICIOUS

PDF

33.6 KB Created: 2020-09-09 21:47:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ef90a5fc2d6e2151e0404b90a0cd5b7f SHA-1: 71668b553da3cb3086322e56490e65833cb0eca2 SHA-256: 7c2344c261ad5ed98f1d7d7a320a8ce3c575f0ea6aca17b02ff2f266dc3cc248
152 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, with one identified as a malicious redirector. The ML classifier also flagged this PDF with high confidence. The presence of a link farm suggests an attempt to obscure the final malicious destination. The document body is heavily obfuscated and contains the primary malicious URL.

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=karaoke+bungong+jeumpa
    • http://files.slimshaynee-gaming.com/uploads/1/3/2/6/132682327/mapejokedu.pdf
    • http://files.sheep.education/uploads/1/3/1/3/131381772/ababac.pdf
    • http://files.cowboyarmory.com/uploads/1/3/1/8/131856950/wonuvuwemiso-wijibajinisatoz-gowip.pdf
    • http://kixajowob.jonespaytonswimming.com/uploads/1/3/1/1/131164250/2562522.pdf
    • http://votuk.laboniteca.com/uploads/1/3/1/1/131163776/lerezanigipa.pdf
    • https://static.usrfiles.com/ugd/18574e_603104cc05274597a95362b4c33eae61.pdf
    • https://static.usrfiles.com/ugd/b5472a_3e87da51a98c417b876db071eb8b32b0.pdf
    • https://static.usrfiles.com/ugd/8bc2a6_dbf4b6e6efb244bdb807612d89c76340.pdf
    • https://static.usrfiles.com/ugd/4733ca_d43de4632ccf43a787bee2a2504ac2f2.pdf
    • https://static.usrfiles.com/ugd/b8c837_9b943771cd09414485b7e159079aa3aa.pdf
    • https://static.usrfiles.com/ugd/97aff7_68f53ca328f94ebb953d97fa9111e29f.pdf
    • https://static.usrfiles.com/ugd/69a512_de96e93218234f55be9dca57005f80bd.pdf
    • https://static.usrfiles.com/ugd/b8c837_7a97b535424944388ee9c23b16124b08.pdf
    • https://static.usrfiles.com/ugd/a07927_d99ee3a91c4d41de8f5c99b28d50903b.pdf
    • https://static.usrfiles.com/ugd/166c09_e99d61157f9a44388f08d813d06c0a83.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_off000047d4.bin
01c5a0bb0bbe175ee6a9b52ddd1859f589832ac7baa26abbe500aa753b3a6fc9
pdf-font-stream PDF embedded font (sfnt) at offset 0x47D4 5180 bytes
font_01_sfnt_off0000596a.bin
4bb1c2da79f99d59c6d8afeea766c0f83d9ca8831cb41d910b25f6bdd1ce59e8
pdf-font-stream PDF embedded font (sfnt) at offset 0x596A 9664 bytes