Malicious PDF — malware analysis report

Static analysis result for SHA-256 9cfba4a3a99923ef…

MALICIOUS

PDF

37.5 KB Created: 2020-07-09 01:56:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2020-09-24
MD5: e8a3e5377aaec22bf4443edf4d55b6e6 SHA-1: 1ac7b19996763012325087c9e14e1edcf80dcbc6 SHA-256: 9cfba4a3a99923ef2f3da371cf9b6cc4da676fedd7d4ee50a5cc7819866176a1
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

This PDF file is identified as malicious due to its extensive use of embedded links, many of which point to known malicious redirector infrastructure. The document body, though partially corrupted, suggests a lure related to 'Viva video tutorial pdf'. The presence of numerous SEO-optimized links indicates an attempt to drive traffic to potentially harmful sites, likely for phishing or malware distribution.

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/wb?keyword=viva%20video%20tutorial%20pdf In PDF document text
    • http://files.traceynjohnson.com/uploads/1/3/1/8/131871829/7098278.pdfIn PDF document text
    • http://files.dragonwhaler.com/uploads/1/3/1/0/131070035/5247360.pdfIn PDF document text
    • http://files.woolstoncommunitycentre.com/uploads/1/3/1/4/131482828/dubabekidifuka.pdfIn PDF document text
    • http://files.isoandbusinessexpert.com/uploads/1/3/0/8/130813797/noxodak.pdfIn PDF document text
    • http://files.fieldsofbeing.com/uploads/1/3/1/4/131437291/9810879.pdfIn PDF document text
    • http://files.northwestfineartstudio.com/uploads/1/3/1/1/131163932/8932669.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://womotisuxapo.files.wordpress.com/2020/06/32268049551.pdfIn PDF document text
    • https://turudilafafo.files.wordpress.com/2020/06/10257373619.pdfIn PDF document text
    • https://xolaruli.files.wordpress.com/2020/07/40284983932.pdfIn PDF document text
    • https://sewizud.files.wordpress.com/2020/06/43167353457.pdfIn PDF document text
    • https://gijiwew.files.wordpress.com/2020/07/19117603804.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/72593533024.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/pepefawabibuf.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/baxumedufimoval.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/figarawevig.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/43778875991.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/58097506778.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/wanojexabe.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005809.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5809 4656 bytes
SHA-256: a15d7c8dda7e8788ca6f6a08c772397b4d6bbdd07e2af30ca2fb2f7c57e530fd
font_01_sfnt_off000067fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x67FB 9776 bytes
SHA-256: 60915b6389d78dd271fd80362cca946d43770c2f8f0a143cdd2148b5965bb561

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