Malicious PDF — malware analysis report

Static analysis result for SHA-256 db5cc893f168b494…

MALICIOUS

PDF

43.3 KB Created: 2020-08-30 15:55:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 36c90f7b00bf7822b6edc991a5c731b2 SHA-1: 3bf996316fcb9f1499c092a8e26b6c4c49c7b35a SHA-256: db5cc893f168b494386a327843671be5643d608e679e72b4d4dd9874873a302a
152 Risk Score

Malware Insights

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

The PDF contains a prominent link that redirects to a malicious URL, disguised with a keyword likely intended to attract users searching for movie downloads. The PDF also hosts a large number of other PDF links, many pointing to the same domain, suggesting a link farm or SEO manipulation tactic. 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.link/wix?keyword=young+frankenstein+full+movie+download
    • https://static.usrfiles.com/ugd/5d2cf3_a125b8e627b44ddc901d19c9a1da564e.pdf
    • https://static.usrfiles.com/ugd/b8c837_0a099aa030a84d0eb09d07f9fefb500f.pdf
    • https://static.usrfiles.com/ugd/b85eb0_353f09b9e50944e8bd77d7a760e73639.pdf
    • https://static.usrfiles.com/ugd/6908d7_799ba7714fa14383b3c6de99922e36b0.pdf
    • https://cdn.shopify.com/s/files/1/0440/9311/2472/files/use_of_computer_in_hospital_pharmacy.pdf
    • https://cdn.shopify.com/s/files/1/0449/6962/3711/files/deformed_baby_in_call_the_midwife.pdf
    • https://cdn.shopify.com/s/files/1/0433/4351/1703/files/fasepenujuwilapot.pdf
    • https://static.usrfiles.com/ugd/b8c837_7254b13464f7453bb03adde8555a7a0a.pdf
    • https://static.usrfiles.com/ugd/b8c837_9af6a01153da4800bb69aa80a8cf6f5b.pdf
    • https://static.usrfiles.com/ugd/b8c837_bbb0d3a6468c4f348c6ca5ee6f45e002.pdf
    • https://static.usrfiles.com/ugd/18f527_174e952bde954d01b8756b3a36438d37.pdf
    • https://static.usrfiles.com/ugd/07625c_d027f83acf414af99dd96d9d63050efa.pdf
    • https://static.usrfiles.com/ugd/b8c837_c97d650ad7d44f28b86e8513a051f3d3.pdf
    • https://static.usrfiles.com/ugd/f09a9d_a4bac0aa9ebc487b9d3b0c84d346d18d.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_off0000690b.bin
ed99f016f24a8e35fa9025f714566a6f5f51b0ed8e3cf2e6fc8637923c266f59
pdf-font-stream PDF embedded font (sfnt) at offset 0x690B 5404 bytes
font_01_sfnt_off00007b6d.bin
0898520dc1659712d206465c32711bf97b0ba98d615da22b3e8a03657e788f2a
pdf-font-stream PDF embedded font (sfnt) at offset 0x7B6D 10664 bytes