Malicious PDF — malware analysis report

Static analysis result for SHA-256 a31a61b4b308481a…

MALICIOUS

PDF

50.0 KB Created: 2020-10-12 10:41:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-17
MD5: 24b1e4010f28198f0e8e18c662a663d4 SHA-1: c3034ea300b4a6e7dcadf29c0f3032a331aab578 SHA-256: a31a61b4b308481a95d93504d4f3efbd754b1ed34a8b5ea60df5bbf6b38aa966
184 Risk Score

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://cctraff.ru/strik?keyword=data+structures+and+algorithms+pdf+goodrich In PDF document text
    • https://site-1043669.mozfiles.com/files/1043669/53479473569.pdfIn PDF document text
    • https://site-1036779.mozfiles.com/files/1036779/20519172326.pdfIn PDF document text
    • https://site-1039875.mozfiles.com/files/1039875/77288142293.pdfIn PDF document text
    • https://site-1048552.mozfiles.com/files/1048552/xitusito.pdfIn PDF document text
    • https://site-1043959.mozfiles.com/files/1043959/34818216145.pdfIn PDF document text
    • http://files.grandmongolianadventures.com/uploads/1/3/1/8/131871505/gazimesegem.pdfIn PDF document text
    • http://fuxinox.slate870.com/uploads/1/3/0/7/130775336/tigatas_xarerowo.pdfIn PDF document text
    • http://files.hfshctra.com/uploads/1/3/1/4/131407214/tojudolus.pdfIn PDF document text
    • http://kejugovi.a-1autoinc.com/uploads/1/3/0/8/130874222/kimudemukowipamebi.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/594cb1cf-88cd-4554-94f3-47bb775477f0/gedukatave.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/abb970a7-0fc1-463a-abbd-776c30d28855/kavoxem.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/304f9282-d902-4628-8697-05f3392f9009/35157489004.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/53e22ab4-6f5d-4d08-b831-80d16f1fff16/batisusodobuvobigaxod.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8c584543-483e-494a-b71f-5b432bb4ae9d/29089982091.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/101255ab-5264-49af-9641-d6d1ba4dfdd0/3619180281.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000700f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x700F 5568 bytes
SHA-256: e357027e7464e668177b3d1c91962b979e44310230fdec18b98795febfe70f64
font_01_sfnt_off000082cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x82CF 10072 bytes
SHA-256: 04f5b8bcb5632afa045cabc0e64da75f3c1f0948a14ff93e486a5d803c6eb91e
font_02_sfnt_off0000a557.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA557 16084 bytes
SHA-256: 40f545b605a758491f9d84ee4d1a8e071ec29cb878aa3e72a2a2e03c7e9c58e9

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