Malicious PDF — malware analysis report

Static analysis result for SHA-256 76743339a8056c89…

MALICIOUS

PDF

45.9 KB Created: 2020-10-14 23:48:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-15
MD5: 531d0bbdc4a8318d5383a8050054ecc2 SHA-1: ab7681ae16cce71f4257cd099c3124a48dc7808f SHA-256: 76743339a8056c897447f2414fbb17fc3aee088e933bd12d3eed1b683cddbe36
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.club/pify?keyword=osrs+bandos+solo+guide+2020 In PDF document text
    • https://cdn-cms.f-static.net/uploads/4365621/normal_5f870cbcce1ec.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367000/normal_5f87313b047e7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366008/normal_5f8711d915507.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367302/normal_5f8741679d531.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367289/normal_5f873e86c750a.pdfIn PDF document text
    • https://keniwuki.weebly.com/uploads/1/3/1/4/131483234/7885719.pdfIn PDF document text
    • https://keniwuki.weebly.com/uploads/1/3/1/4/131483234/digokasawuj-jipamuputevuf.pdfIn PDF document text
    • https://wuvirinofibugiz.weebly.com/uploads/1/3/1/0/131070402/nodomiw_ditikerox_sixodipigoda_tupujolapaponog.pdfIn PDF document text
    • https://babikovinemixe.weebly.com/uploads/1/3/1/8/131856339/tuberokaxe.pdfIn PDF document text
    • https://rabifupokuwu.weebly.com/uploads/1/3/1/1/131164250/8256202.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/d25f6be5-5ed2-4b6b-a3c4-9259f4581e9a/sibijiduvetibu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aaed753f-9be1-4e9a-9edb-a3245bbf0599/41838611018.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c40acccb-cc9c-425a-bb58-ec1e80a52997/safupijabuguvirixolobibe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d901c62b-84b7-421b-bad2-ba9b7c065e79/bifetozivikil.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/15907c3d-3c1e-4658-9896-b33eb0b4c3d4/93208991776.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d075e235-a795-4788-98b7-6eb425dde291/61229217654.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/925bdedc-c254-4306-824b-6b012bd0892e/tamoxuvabopiv.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2855aee6-1511-4e93-a277-d6d44f49ee67/fedugujugavalesazup.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1ba2f57a-47b4-4ffd-9c0c-41f6677b7478/62849386897.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3c38029f-25ff-4153-88ce-c1dec0a92990/zosev.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/25369e48-c363-48f1-9eb5-0a9e0d2f363c/58056183299.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_off000074c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x74C8 5432 bytes
SHA-256: 4732044a8017ba25299bf91bf661fe97d152a17e160305f7176f6138150665b9
font_01_sfnt_off00008745.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8745 10208 bytes
SHA-256: 2496e9abf6ea6c68757b54539722d889fadd7d3d29eb7c8d4910106f2b9d9000

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