Malicious PDF — malware analysis report

Static analysis result for SHA-256 eef4475ddf2d3474…

MALICIOUS

PDF

36.3 KB Created: 2020-09-02 06:39:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e8c5630aba22f1ec91223adb33382bc3 SHA-1: bed79a98753dd37cb0b86660b940a0848b52b575 SHA-256: eef4475ddf2d34741d6db07ccaa5d35e071fb8d4f71d6685dae0e23ad4d233d4
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, which is also present in the document body. This link, `https://ttraff.cc/wix?keyword=mod%25C3%25A8le+cv+format+banque+mondiale`, is likely used to deliver a secondary payload. The document also exhibits characteristics of a PDF link farm, with numerous links to external PDFs, suggesting a broader distribution or SEO poisoning tactic. The ML classifier strongly supports the malicious nature of this PDF.

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=mod%25C3%25A8le+cv+format+banque+mondiale
    • https://static.usrfiles.com/ugd/0d2908_67ea6449c66642489483feb55641cb3a.pdf
    • https://static.usrfiles.com/ugd/af0aa9_d9d986be50e947f1997c5239e66f2b75.pdf
    • https://static.usrfiles.com/ugd/c3548c_13ced7776e8743fe9ae090dd938ca52d.pdf
    • https://static.usrfiles.com/ugd/b8c837_17f2d0d1802447c38a057c3112e74646.pdf
    • https://static.usrfiles.com/ugd/8b97dd_309c3cc594fe423bafb088cf4be88a73.pdf
    • https://static.usrfiles.com/ugd/fb5067_0c37e2fdab6f47b099b55aa51bf2850c.pdf
    • https://static.usrfiles.com/ugd/21a131_df2107baeaff460a9a248d189fc2870a.pdf
    • https://static.usrfiles.com/ugd/837d34_5a1f6976059148e99eddb072146ad3b0.pdf
    • https://cdn.shopify.com/s/files/1/0438/0514/7298/files/manual_testing_aptitude_questions_and_answers.pdf
    • https://cdn.shopify.com/s/files/1/0431/2776/7206/files/addition_and_subtraction_of_vectors.pdf
    • https://cdn.shopify.com/s/files/1/0433/6805/4949/files/17410079139.pdf
    • https://cdn.shopify.com/s/files/1/0430/3811/3955/files/acute_abdomen.pdf
    • https://static.usrfiles.com/ugd/b8c837_19264833cbd04ddc9aec8a20a8d52c93.pdf
    • https://static.usrfiles.com/ugd/a298ce_2eeddc8cefb540429b06345256a210f0.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_off00004bf5.bin
b38f56dde5a1214791cf6c667eb3edee5d81733fbb6d5726569c987d15e03d01
pdf-font-stream PDF embedded font (sfnt) at offset 0x4BF5 5460 bytes
font_01_sfnt_off00005e3f.bin
8039a18e20dcc137e5a5301a1a255c215969edd3a5f44ccf7671c90d59c518aa
pdf-font-stream PDF embedded font (sfnt) at offset 0x5E3F 11336 bytes