Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c9d92a267238d86…

MALICIOUS

PDF

57.2 KB Created: 2020-10-04 02:40:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 084472cbcbb43ee62bac3ca3c6e9872d SHA-1: ece1b7e96f62daa3441a0e50a23805bd35c8b626 SHA-256: 3c9d92a267238d86136f6c9b7dfee8f85d3a094653cd08764e5bea3f4ad1a6f9
184 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded links, many of which point to disposable hosting and redirector infrastructure, indicating a link farm or phishing attempt. The ML classifier strongly flagged this PDF as malicious, and the embedded URLs are associated with known malicious redirectors. No scripts were extracted, but the document body itself contains URLs that are part of the link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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/strik?keyword=resume+menon+platon+pdf In PDF document text
    • http://files.slr-ofs.org/uploads/1/3/0/9/130969158/2121317.pdfIn PDF document text
    • http://files.midnightpigeon.com/uploads/1/3/0/8/130814030/5a94f3e7a0e6c.pdfIn PDF document text
    • http://tatipox.kansascitydreamkeepers.com/uploads/1/3/0/8/130814297/f51bbb182e1a469.pdfIn PDF document text
    • http://files.thirdgradegenius.com/uploads/1/3/1/4/131453274/regisofu.pdfIn PDF document text
    • http://kuviguf.wickedwomeninwords.com/uploads/1/3/2/8/132814930/6230335.pdfIn PDF document text
    • https://site-1036798.mozfiles.com/files/1036798/94214671110.pdfIn PDF document text
    • https://site-1042665.mozfiles.com/files/1042665/19485093947.pdfIn PDF document text
    • https://site-1036725.mozfiles.com/files/1036725/tusanamusefavojogoravir.pdfIn PDF document text
    • https://site-1039728.mozfiles.com/files/1039728/27199284902.pdfIn PDF document text
    • https://site-1039935.mozfiles.com/files/1039935/35885996450.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/d11907ef-8a0e-4bb7-b17c-9ae1ff5d9692/pixazubepojo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c398a83d-3800-43ee-b967-2de98a968494/fofirebirudusizu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4c55012b-03d8-4a79-af50-9e4d8c1dd5a2/96615552599.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f1f1b111-6b89-47ac-9be0-7e33b5378ef5/dafenabizix.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2251b61b-af38-44ad-a363-2dd2da895fe4/jikuf.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/85695d9b-6350-4f73-a0db-63a52abb3f3b/bofabevibo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ed8c340d-9291-4942-8191-56f237f2fb3a/55952499815.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/41a37544-87da-4094-b11e-345b88877c03/31217372611.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_off00009a20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9A20 5096 bytes
SHA-256: 615ea0067b2cd88bc911c1f91c837e249a4995beb43dab03aa5149a209608ec1
font_01_sfnt_off0000ab6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAB6A 14332 bytes
SHA-256: c33fb8013c2671c62829e874a1e2b051ef71a7590b7973b20c4737ac9a8015d8

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