Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e6074888e7afa48…

MALICIOUS

PDF

61.9 KB Created: 2020-10-07 08:51:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: e9bf0a4592227abb0aa60d8c806dee5f SHA-1: b2cb8469f493ce9875b1647bc9214ca6e86be298 SHA-256: 4e6074888e7afa48e88f00b127f7e08e0576d66a07cd5071b3f3a2dcfc416137
154 Risk Score

Malware Insights

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

The PDF contains embedded links, one of which, https://cctraff.ru/strik?keyword=horde+leveling+guide+1-+110, is flagged as malicious. The document body, though heavily obfuscated, also contains this URL, suggesting it's a lure. The presence of numerous other PDF links, some pointing to external resources, indicates a link farm or redirection strategy. The ML classifier strongly supports the malicious verdict.

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/strik?keyword=horde+leveling+guide+1-+110 In PDF document text
    • http://files.kurtweissgerber.com/uploads/1/3/1/0/131071252/mimaguser.pdfIn PDF document text
    • http://files.bayareadivorcemidwife.com/uploads/1/3/1/0/131070646/12703189ca.pdfIn PDF document text
    • http://files.3925robotics.com/uploads/1/3/0/7/130739016/torejolizugewaduw.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/900c7b09-3842-4318-b460-435c8310917d/jedal.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d04b31af-8101-49bc-9a45-0292c4c57234/depimizirumalajopixoxif.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/807b7ad5-ae75-4482-a970-a27fbcdaba26/kerewomerituvapilo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/117b8118-69ed-4d25-9482-ae6f6f6ce5f4/49894647497.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0949a5aa-2f73-4cd7-ba2f-e30c0b305cc4/raviwamafaxat.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f7462cdd-b33a-4eb8-ab97-b8fbd11e09d0/49847142362.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b13aa06a-ac12-4263-92bb-090393efdc98/nemoforizazizemijedofe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d8adfd8a-64b1-4138-bc4c-888c38548879/13898888891.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00009306.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9306 4656 bytes
SHA-256: 1ea8bd4d25554de0b905a2487e6ccb0e11c03f51c56a28af4b26835bae0123fb
font_01_sfnt_off0000a2eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA2EB 10472 bytes
SHA-256: edb692e25a0280a0256162b29076e7529d08c92005b47b55cd63cd4446c306d0
font_02_sfnt_off0000c6b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6B5 16312 bytes
SHA-256: bf8f9ece8d9d74ce2d7a98a07ee1bb8f4056faf702b3b1702118181e85f1b939
font_03_sfnt_off0000dc40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC40 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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