Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b9ca646ee5f5753…

MALICIOUS

PDF

131.3 KB Created: 2020-10-07 07:43:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 870c018fba44636cb8f79c7279fef68a SHA-1: 5d34f151148152d512a840a7f620a58eef87cbf9 SHA-256: 3b9ca646ee5f5753107dc2792a8be79ec71721fa868087e2f8c0d56fd55fe10b
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of embedded links, many pointing to external PDF files, suggesting a link farm or SEO manipulation tactic. One of the embedded URLs, 'https://gettraff.ru/pify?keyword=combustion+leak+tester+napa', is flagged as a malicious redirector. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9897

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://gettraff.ru/pify?keyword=combustion+leak+tester+napa In PDF document text
    • https://site-1048529.mozfiles.com/files/1048529/77324745560.pdfIn PDF document text
    • http://naditopu.kentsmerdon.com/uploads/1/3/1/8/131856040/b1ddda6ed.pdfIn PDF document text
    • http://files.coolgeekzatl.com/uploads/1/3/1/4/131437619/e2e377657fa17.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0482/0081/0653/files/gas_variables_pogil_worksheet_answers.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0487/0891/1254/files/rfid_dog_door_reddit.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/8151/5673/files/ge_fanuc_series_90-30_plc_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/84a214a4-93fb-4304-ae19-685fe86124e8/suzeboxaxex.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8b36de24-31ce-463a-b682-db2b5a3863cf/nexad.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001bc6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1BC6E 5072 bytes
SHA-256: 9113f5e267e56e3cf14ae85a5ed9254fb62e880be72d876f80a484e954224c83
font_01_sfnt_off0001cd88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1CD88 16416 bytes
SHA-256: 22d37e7b484e3839d2cd80833f58db7b37d073a2783ced78878a2f8e1b60dc78