Malicious PDF — malware analysis report

Static analysis result for SHA-256 0173d0f0b9e3a37b…

MALICIOUS

PDF

33.6 KB Created: 2020-08-31 09:49:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6590057cb53cb489e4657f6b20da65f1 SHA-1: 083b68fe9d49c2df108fc9b0251dfd5008aac21f SHA-256: 0173d0f0b9e3a37b3db8acd419bf439cc004966f38246389b4d7b34d01131100
154 Risk Score

Malware Insights

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

The PDF document contains a large number of embedded links, with a critical heuristic firing indicating it's a malicious redirector link farm. One of the primary URLs, 'https://ttraff.cc/wix?keyword=cessna+182+poh', is flagged as malicious. The document body, though heavily obfuscated, also contains this URL, suggesting the document's purpose is to lure users into clicking malicious links, likely for further exploitation or phishing.

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=cessna+182+poh
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/07625c_07b8840a5b554beb9a5381f2ddf24130.pdf
    • https://static.usrfiles.com/ugd/e23fbb_6d3bde0279cb4c95a35413b488d28015.pdf
    • https://static.usrfiles.com/ugd/b8c837_1e8dad06ab114994a11c46421c81dde1.pdf
    • https://cdn.shopify.com/s/files/1/0457/6703/2998/files/co-_active_coaching.pdf
    • https://cdn.shopify.com/s/files/1/0434/9224/5656/files/40480769158.pdf
    • https://cdn.shopify.com/s/files/1/0434/0292/0086/files/21020767810.pdf
    • https://cdn.shopify.com/s/files/1/0434/1488/0405/files/goldman_s_cecil_medicine.pdf
    • https://static.usrfiles.com/ugd/b8c837_c79df8530f58410ab29620deeff8cf9f.pdf
    • https://static.usrfiles.com/ugd/97368a_711752ced2994e8ab715e962093d7cf4.pdf
    • https://static.usrfiles.com/ugd/38bf1f_959cc4a7c03d4fea95f02898563b42d0.pdf
    • https://static.usrfiles.com/ugd/4d400c_cbd4ac931dbf4a6c867823fe7b0d0d69.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004690.bin
1dd518af69f0e210a34678beeda622508851ecf9e89ba00628dfe6e4c53c2145
pdf-font-stream PDF embedded font (sfnt) at offset 0x4690 5064 bytes
font_01_sfnt_off000057c6.bin
99c845624406525d7d16d73b5d9f46078365113cb985ede070cd10cab1ef14b6
pdf-font-stream PDF embedded font (sfnt) at offset 0x57C6 10016 bytes