Malicious PDF — malware analysis report

Static analysis result for SHA-256 997f1a63e507bc53…

MALICIOUS

PDF

43.1 KB Created: 2020-08-31 04:43:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c95d655d8344d5afbdf56232253a0e13 SHA-1: 05528c1b9782a2648953bbccf7c961ec88c2c060 SHA-256: 997f1a63e507bc538b820b08f5ed17f5b12cdc63d4824e77e88b64f11850aa69
152 Risk Score

Malware Insights

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

The PDF contains a significant number of embedded links, with a critical heuristic firing for a PDF link farm. One of these links, 'https://ttraff.cc/wix?keyword=s%25C3%25A9quence+%25C3%25A9lection+d%25C3%25A9l%25C3%25A9gu%25C3%25A9s+cycle+2', points to known malicious redirector infrastructure. The ML classifier also strongly indicated maliciousness. The document body is heavily obfuscated, but the presence of numerous links suggests a lure or redirection mechanism.

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.cc/wix?keyword=s%25C3%25A9quence+%25C3%25A9lection+d%25C3%25A9l%25C3%25A9gu%25C3%25A9s+cycle+2
    • https://cdn.shopify.com/s/files/1/0429/0609/1673/files/bexefabuzika.pdf
    • https://cdn.shopify.com/s/files/1/0438/4607/4525/files/fibujerokegofokekozupow.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/figarawevig.pdf
    • https://static.usrfiles.com/ugd/b8c837_d68c0965a14c4a3083f3c9f0077d06fc.pdf
    • https://static.usrfiles.com/ugd/3cb679_4d7398bcdbcd4b4e9d058966ca4776a6.pdf
    • https://static.usrfiles.com/ugd/b8c837_a84e7df5727f4f7096af69625a29be4f.pdf
    • https://static.usrfiles.com/ugd/2c8d66_8973932430b544588eb7062d1aea2004.pdf
    • https://static.usrfiles.com/ugd/d5d855_5a6331acf06d4e2288bdfd9a18903c52.pdf
    • https://static.usrfiles.com/ugd/8dde66_c0be1d447f524b7190f83041ec660ee9.pdf
    • https://cdn.shopify.com/s/files/1/0429/8221/1733/files/nhs_grampian_palliative_care_guidelines.pdf
    • https://cdn.shopify.com/s/files/1/0432/8367/7339/files/rave_master_episode_52.pdf
    • https://cdn.shopify.com/s/files/1/0433/5563/5871/files/lactational_amenorrhea.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_off00005fb3.bin
d773b95a0374289228449b0b0b4c1c4ad29a72c1efe83ecd980eeb75d70c0944
pdf-font-stream PDF embedded font (sfnt) at offset 0x5FB3 5404 bytes
font_01_sfnt_off000071d9.bin
d9f96797a54aa890ffc864a62d0ee1bea369dc139b9f5922dbee51669d5f236a
pdf-font-stream PDF embedded font (sfnt) at offset 0x71D9 1796 bytes
font_02_sfnt_off00007a65.bin
71de55d4a9087162c06c5767e15a9b35ed8a4e8e96e539bd79a1b7037ea2e660
pdf-font-stream PDF embedded font (sfnt) at offset 0x7A65 10980 bytes