Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8c10c13463c73dd…

MALICIOUS

PDF

39.9 KB Created: 2020-10-21 08:50:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2020-12-26
MD5: 322d7260a8c844f7193f69a552c8b2aa SHA-1: 86ae2833a17539398be6972b2347113eac476b96 SHA-256: b8c10c13463c73ddf7728b5962d7976f71ba9e9d7a9b0926d524b336fc87e027
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/123?keyword=comprehensive+gynecology+5th+edition+pdf+free+download In PDF document text
    • https://dufevirefat.weebly.com/uploads/1/3/1/4/131438490/jawanal.pdfIn PDF document text
    • https://kuvofexe.weebly.com/uploads/1/3/1/1/131163751/boxevoputuwoge.pdfIn PDF document text
    • https://tenabawik.weebly.com/uploads/1/3/2/7/132710661/6969617.pdfIn PDF document text
    • https://gonoloxezejuje.weebly.com/uploads/1/3/1/4/131410007/nugakexefawola.pdfIn PDF document text
    • http://www.ascendercorp.com/In extracted file (font_00_sfnt_off00005bb4.bin)
    • http://www.ascendercorp.com/typedesigners.htmlIn extracted file (font_00_sfnt_off00005bb4.bin)
    • https://s3.amazonaws.com/sugaguxagu/clinical_pharmacy_therapeutics_roger_walker.pdfIn PDF document text
    • https://s3.amazonaws.com/wonoti/75577766067.pdfIn PDF document text
    • https://s3.amazonaws.com/zetare/januvu.pdfIn PDF document text
    • https://s3.amazonaws.com/gupuso/lezezuxikix.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f7f61400-3951-4187-85c5-d89f4adb1e59/xibajusi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/47550e47-6969-4c45-8ed0-09174f232ca0/31037486772.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d216e90c-dd71-451f-8a49-434e6000a32a/xaronedawo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/00a90701-0c86-439a-8b42-5603036d57fa/77523915498.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0b1be72b-5b07-4204-ae6b-257d03ae29c6/80650531590.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4fc855f4-b924-4cf1-b9ca-74d2d8f8993d/66558976840.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6eeef813-3cdd-4337-bfe7-965a970cfcd5/latimiwa.pdfIn PDF document text
    • https://s3.amazonaws.com/subud/79342657171.pdfIn PDF document text
    • https://s3.amazonaws.com/tadovu/63403236340.pdfIn PDF document text
    • https://s3.amazonaws.com/gupuso/sigudokeguj.pdfIn PDF document text
    • https://s3.amazonaws.com/tadovu/audit_finalization_procedures.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 extracted file (font_00_sfnt_off00005bb4.bin)

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005bb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5BB4 5852 bytes
SHA-256: bd2bf5621f94f1a97765debfcfa5db9dceac720abf46a121184f8fe64f5adb43
font_01_sfnt_off00006f94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6F94 10124 bytes
SHA-256: 8a4e55986fd3bd4002a0fa0f64ac99a5ccecbacb3933efe4f14f39d852027ded