Malicious PDF — malware analysis report

Static analysis result for SHA-256 6bfb01ba4a4d6444…

MALICIOUS

PDF

39.1 KB Created: 2020-11-08 19:20:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 10c2161cdd98067b2d2b84c9f3258a0c SHA-1: ebbca25f20b258b84e55ccd092787183e77c68de SHA-256: 6bfb01ba4a4d64443a618c934cad179bee552e2c6e390b413cc4103de861c061
194 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded links, with a critical heuristic firing indicating it points to known malicious redirector infrastructure. The document body, though obfuscated, contains the URL 'https://ggtraff.ru/123?keyword=princeville+school+district+calendar', which is also flagged as a high-risk SEO redirector. This suggests the PDF is part of a link farm or phishing campaign designed to redirect users to malicious sites.

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://ggtraff.ru/123?keyword=princeville+school+district+calendar In 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://uploads.strikinglycdn.com/files/0052358c-580e-4479-9e29-78f677bee423/geditolanodoso.pdfIn PDF document text
    • https://tigifapenuf.files.wordpress.com/2020/11/32470441788.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0de2c697-843d-4d45-861d-dbc80b26e8da/279755681.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5abf6d7c-346d-404b-87b7-8d4f65cffa13/jowekirunikogemedip.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6254f742-98c1-4c9e-bfff-de7f91b433f3/price_pfister_kitchen_faucet_parts.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3909b0b2-285b-48ae-9c1e-a6700f78d194/32497034788.pdfIn PDF document text
    • https://s3.amazonaws.com/fujadabez/47262719526.pdfIn PDF document text
    • https://pupirod.files.wordpress.com/2020/11/sagob.pdfIn PDF document text
    • https://s3.amazonaws.com/vikukinumet/blackhawk_middle_school_beaver_falls_pa.pdfIn PDF document text
    • https://s3.amazonaws.com/mexijegedakol/60779985435.pdfIn PDF document text
    • https://s3.amazonaws.com/sefiwegegagu/legal_seafood_seaport_boston_ma.pdfIn PDF document text
    • https://s3.amazonaws.com/nitirew/cardizem_davis_plus.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_off00004f2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4F2D 4876 bytes
SHA-256: db5d0fce207ded04b4f8790183e439088857d6b40061bfca37fe648cf425f14e
font_01_sfnt_off00005fa4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5FA4 9984 bytes
SHA-256: 8c3b35cdd2e3b5a7a5134561eb1bdf445e8e1d923ea372fa9c6f1c1ea3117da7
font_02_sfnt_off000081b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x81B7 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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