Malicious PDF — malware analysis report

Static analysis result for SHA-256 d1da4db8279980b7…

MALICIOUS

PDF

44.8 KB Created: 2020-11-04 09:02:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: af03366b50c2f6795d6c95f119d4fdd1 SHA-1: d5d3161c69fe53168bb9360a1662efba12c237d6 SHA-256: d1da4db8279980b75352970badba443d0af81006739cb139b65c6836aae45870
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of embedded links, many of which point to external PDF files, suggesting a link farm for SEO manipulation. One prominent URL, https://cctraff.ru/aws?keyword=university+calculus+early+transcendentals+pdf, is flagged as a malicious redirector. The document body, though heavily obfuscated, also contains this URL and other links to PDF files, reinforcing the lure of academic content to redirect users to malicious infrastructure. No scripts were extracted, but the heuristic firings strongly indicate a malicious redirector and link farm pattern.

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://cctraff.ru/aws?keyword=university+calculus+early+transcendentals+pdf
    • https://xudibonazo.weebly.com/uploads/1/3/4/3/134353284/4555646.pdf
    • https://cdn-cms.f-static.net/uploads/4372358/normal_5f9cd1ba09f8d.pdf
    • https://cdn-cms.f-static.net/uploads/4386622/normal_5f911b5215f7a.pdf
    • https://cdn-cms.f-static.net/uploads/4377095/normal_5f9870a78552e.pdf
    • https://cdn-cms.f-static.net/uploads/4369190/normal_5f8bb5e7c693f.pdf
    • https://cdn-cms.f-static.net/uploads/4381546/normal_5f96eb0f85bfa.pdf
    • https://wuwenivavubujer.weebly.com/uploads/1/3/1/4/131437756/186d07.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/6b7ca8fe-7537-422c-bfd8-337ba8300493/joligivura.pdf
    • https://uploads.strikinglycdn.com/files/7ec636e7-1c17-4cc5-8451-e3fe4adcf4e2/multi_crew_pilot_license_program.pdf
    • https://uploads.strikinglycdn.com/files/5f4617db-ce7c-44d9-b9a8-25ffebd5a812/fowozezimivala.pdf
    • https://uploads.strikinglycdn.com/files/64576dbe-d9f9-4272-81dd-024eaaf6433a/68368861118.pdf
    • https://uploads.strikinglycdn.com/files/0fc74687-f75a-45a1-bea2-dd0a24bc6f2b/89762970339.pdf
    • https://uploads.strikinglycdn.com/files/5586e1de-4323-44d0-bc6f-869a20026f1b/visidises.pdf
    • https://uploads.strikinglycdn.com/files/e0f57610-f7eb-4222-9ee0-a0fcd7289578/38786934544.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_off00007124.bin
123d5dd5e02f71eb4f73d72641a6265fc6beee9571e33d9823e151058c0c75d1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7124 5304 bytes
font_01_sfnt_off0000834f.bin
b7d72190b216770eb46fad6024e9d50e537d8900fddc7a3f2744d8924f81d081		 pdf-font-stream PDF embedded font (sfnt) at offset 0x834F 10680 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.