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)
MD5: e8a3e5377aaec22bf4443edf4d55b6e6 SHA-1: 1ac7b19996763012325087c9e14e1edcf80dcbc6 SHA-256: 9cfba4a3a99923ef2f3da371cf9b6cc4da676fedd7d4ee50a5cc7819866176a1
154 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 4

  • 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.
  • 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
    • http://files.traceynjohnson.com/uploads/1/3/1/8/131871829/7098278.pdf
    • http://files.dragonwhaler.com/uploads/1/3/1/0/131070035/5247360.pdf
    • http://files.woolstoncommunitycentre.com/uploads/1/3/1/4/131482828/dubabekidifuka.pdf
    • http://files.isoandbusinessexpert.com/uploads/1/3/0/8/130813797/noxodak.pdf
    • http://files.fieldsofbeing.com/uploads/1/3/1/4/131437291/9810879.pdf
    • http://files.northwestfineartstudio.com/uploads/1/3/1/1/131163932/8932669.pdf
    • https://womotisuxapo.files.wordpress.com/2020/06/32268049551.pdf
    • https://turudilafafo.files.wordpress.com/2020/06/10257373619.pdf
    • https://xolaruli.files.wordpress.com/2020/07/40284983932.pdf
    • https://sewizud.files.wordpress.com/2020/06/43167353457.pdf
    • https://gijiwew.files.wordpress.com/2020/07/19117603804.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/72593533024.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/pepefawabibuf.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/baxumedufimoval.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/figarawevig.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/43778875991.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/58097506778.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/wanojexabe.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/

Extracted artifacts 2

Files carved from inside the sample during analysis.

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