Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd16f0fa701c9e44…

MALICIOUS

PDF

41.9 KB Created: 2020-09-08 08:47:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0d5320ddb95e32b83fb28ab4565a08fe SHA-1: ef0d462d826b9398534e5f795e44fa0cdffc9324 SHA-256: fd16f0fa701c9e444af63087bd52615af397b8deb4e192aed7f9cfccbff43f3b
152 Risk Score

Malware Insights

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

The PDF contains embedded links, with one prominent URL identified as a malicious redirector. The document body, though heavily obfuscated, also contains this URL, suggesting an attempt to direct the user to malicious infrastructure. The presence of numerous external PDF links further indicates a link farm, a common tactic for SEO poisoning or distributing malicious content. The ML classifier strongly flagged this PDF as malicious.

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.me/wix?keyword=ul+creepage+and+clearance+guidelines
    • https://static.usrfiles.com/ugd/941881_96c22caa439041d7b59e1a46731ac9b2.pdf
    • https://static.usrfiles.com/ugd/50de67_d7c82c07e69c44b39391019b6fe4fa9c.pdf
    • https://static.usrfiles.com/ugd/1ee69b_e743e959704f48d482f822dd61e2c28e.pdf
    • https://static.usrfiles.com/ugd/b371d9_2f686d29f47e413ca87c1711a3b2a4e0.pdf
    • https://static.usrfiles.com/ugd/b5aed9_81cb43f3054f45189f2342af150df65c.pdf
    • https://static.usrfiles.com/ugd/72216b_0bb4b2e646f842d6b1a8a77afa281364.pdf
    • https://static.usrfiles.com/ugd/b50c55_95519ba2f9b74e398d47232a330cde1b.pdf
    • https://static.usrfiles.com/ugd/f65518_b412a43e187743668bcff65f28dd8a68.pdf
    • https://static.usrfiles.com/ugd/10a4aa_381ff53bf9b04f169aa40709d83c0ae6.pdf
    • https://cdn.shopify.com/s/files/1/0431/0892/5602/files/bimanowalun.pdf
    • https://cdn.shopify.com/s/files/1/0446/5927/7987/files/fobia_social_tratamiento_cognitivo_conductual.pdf
    • https://static.usrfiles.com/ugd/63d3ad_087fa3457013427ebac3cd09dce3e543.pdf
    • https://static.usrfiles.com/ugd/93971e_a819e7a0fc704547a9edfcafb742359b.pdf
    • https://static.usrfiles.com/ugd/0e2875_2226af9ca16d4a41987f610b9b79eaca.pdf
    • https://static.usrfiles.com/ugd/67f5f7_a2eb0773cee74a1899a947c95093ff50.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_off0000671b.bin
ed40a4cea1cd560e408bb7fe2551d3c3456fa6e6c771d5339112571d6d358aba
pdf-font-stream PDF embedded font (sfnt) at offset 0x671B 5232 bytes
font_01_sfnt_off000078f4.bin
e1cf8e14d1a536ae1866c71265cd2c46d9680cbce9cfeeedf667b5ca25452740
pdf-font-stream PDF embedded font (sfnt) at offset 0x78F4 9764 bytes