Malicious PDF — malware analysis report

Static analysis result for SHA-256 8966a6601a877d0a…

MALICIOUS

PDF

56.5 KB Created: 2020-10-04 09:31:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-15
MD5: 78e72be40771210362090527cfd4cc09 SHA-1: a5e4ebb40d8ebfa58c1777b6872dbfb06686c3bf SHA-256: 8966a6601a877d0abcd3e23ab3abdcddad54fc418ecc851752deba2be206aff1
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://cctraff.ru/strik?keyword=monster+hunter+world+buffs In PDF document text
    • http://vawilino.ottervisionuniversal.com/uploads/1/3/2/7/132740214/jirapi.pdfIn PDF document text
    • http://jiwif.valleycycles.org/uploads/1/3/2/3/132302978/fexokamudogaw.pdfIn PDF document text
    • http://nanis.slcpreschool.com/uploads/1/3/1/4/131482975/4487772.pdfIn PDF document text
    • http://files.karuewachiraphotography.com/uploads/1/3/1/0/131070481/peguzaguba.pdfIn PDF document text
    • http://kisevesir.commsailpistakee.org/uploads/1/3/1/3/131379730/948058.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/4556/0225/files/the_bridge_across_forever_download.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/3911/3895/files/velo_de_novia_cascada.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/6012/5080/files/81904014260.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/90d9c9af-f2b5-4eaa-aa2a-a46f69397452/wemajivutemifapexuvawib.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7e4fb961-f6bf-4272-9003-fba0e9b7512f/17655525949.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c8414747-f03c-475f-8f97-ff4b1aa8c7b2/fowumoge.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d8ac0af5-76ef-4cc1-b063-d5d79328ea79/sigozejatapeximaxi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/117b5231-f035-4de2-af55-3c5e7640b7a9/75976588642.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000631e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x631E 9584 bytes
SHA-256: 752fe8a969aefe58ecc672d01bd8a6095e29599865246b50bb52e79239d2a0ef
font_01_sfnt_off0000836b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x836B 5024 bytes
SHA-256: 77e5e18706b20254c96a97e9802fc3f8f604677ad4c5aa360ce7f24f794a9233
font_02_sfnt_off00009490.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9490 10404 bytes
SHA-256: 1ba402bcd6a4441819e112ed10776a4c6e61d60b9255430cf8e1a5ab95ad37ba
font_03_sfnt_off0000b859.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB859 17672 bytes
SHA-256: d936b2c3fe1b7be5c149e9739349d7dc1d5e937b6d85cb5f85a9284649fe8982

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