Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7e16b0074188240…

MALICIOUS

PDF

45.8 KB Created: 2020-10-26 14:06:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-03-01
MD5: fde369bbbf84f6c46c07320f044eebf4 SHA-1: f33786cd32bdbc2dacee47830b66035d90c81699 SHA-256: a7e16b00741882401310ba3c9c53f9f7ad87facdf67d4a0ff0d01e7172a66b4d
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.cc/123?keyword=mac+mini+user+manual In PDF document text
    • https://nukubutoti.weebly.com/uploads/1/3/2/3/132302768/6303991.pdfIn PDF document text
    • https://pisanofinupu.weebly.com/uploads/1/3/1/4/131437881/597cad04.pdfIn PDF document text
    • https://fimosezit.weebly.com/uploads/1/3/0/7/130775491/7938937.pdfIn PDF document text
    • https://tenabawik.weebly.com/uploads/1/3/2/7/132710661/4bd228e73a.pdfIn PDF document text
    • https://tavumake.weebly.com/uploads/1/3/2/7/132740551/2d7adc.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://s3.amazonaws.com/ribowexulo/importance_of_axiology_to_a_teacher.pdfIn PDF document text
    • https://s3.amazonaws.com/henghuili-files2/91532457696.pdfIn PDF document text
    • https://s3.amazonaws.com/rekawexuretowo/acids_bases_and_salts_class_10_questions_and_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/mijedusovineti/janigusebidasodogodukodox.pdfIn PDF document text
    • https://s3.amazonaws.com/xojafemori/charitable_trust_deed_sample.pdfIn PDF document text
    • https://s3.amazonaws.com/xumakomowi/anglo_norman_period.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0e82764f-19fd-443c-b0c4-9445f7c64a31/introduction_to_aircraft_flight_dynamics.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bb1860bf-0e3d-4a14-b42a-8000a05c76f5/zexagezevumi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1071ea65-07a4-4764-a985-a70ab7d923a9/48169033404.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/98411888-a3b6-44d9-a2d2-e71a7ae65014/dudowejupumowewoz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a5e96103-2f6e-4605-8c66-1993002c169f/gupovipogenuwofu.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006a80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6A80 4640 bytes
SHA-256: c2b6fd25f80eb8c217089be0d9efa54f334483256b5a354ca9336ba8a0859811
font_01_sfnt_off00007a14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7A14 10144 bytes
SHA-256: cf355cda445f02891259bf9e7b44429206da107b5d427d72e78bb7241fc3b968
font_02_sfnt_off00009caf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9CAF 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3

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