Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4197e8a31b3ccb1…

MALICIOUS

PDF

36.3 KB Created: 2020-10-05 01:33:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-17
MD5: 0f339269cda90024617d33b1f68c166d SHA-1: 7802b975dc155809fa0da361880169212da0f432 SHA-256: f4197e8a31b3ccb1c6843e2c18bdf177737718bd70de30d5d701fdab37d26746
194 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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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://ttraff.link/pify?keyword=elder+scrolls+legends+high+rock+summoner In PDF document text
    • https://site-1040319.mozfiles.com/files/1040319/23375351220.pdfIn PDF document text
    • https://site-1036805.mozfiles.com/files/1036805/nobakutili.pdfIn PDF document text
    • http://wemisa.superspecracing.com/uploads/1/3/1/0/131071256/d89e82d3bb0059.pdfIn PDF document text
    • http://files.algebrahd.org/uploads/1/3/1/8/131871817/wesesigusuwod-pubegotoja-malawawaxugu-powugekurij.pdfIn PDF document text
    • http://zamuno.cmurillo.com/uploads/1/3/1/4/131483128/0207b27ac.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/2190b4e6-7807-43dd-9c39-15defecea9cb/kajamubisofep.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c01bbb2e-8087-4645-bf44-c9fb6df9af39/salusum.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/13bd159b-1a66-4678-88ab-45918c85f13b/81117110627.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3d2df79a-1b5e-4f97-9193-5f97f6e0d79f/65453514364.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_off000051b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x51B0 5164 bytes
SHA-256: 04837e63296c9d99c4f705dcf2dc4c2f66e252128bc02a3b514f80f0e151b85e
font_01_sfnt_off00006319.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6319 9812 bytes
SHA-256: b02673ba2c9f4b52273dad44b2f351a038e121151b46278e77c403395289c65e