Malicious PDF — malware analysis report

Static analysis result for SHA-256 796c37ec6976d64a…

MALICIOUS

PDF

69.0 KB Created: 2020-09-17 05:08:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c1461eb08e3160b7cef2b787d5279651 SHA-1: a78c145b43e9a6cca17654c7ae5a0f5aa24b0af6 SHA-256: 796c37ec6976d64afe971952d0f936d0d0c13ec5ee9edee1a562b96ae768fe5c
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with several pointing to known malicious redirector infrastructure and link farms. The ML classifier strongly indicated maliciousness. While no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to redirect the user to malicious sites, likely for phishing or to download further payloads.

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.club/pify?keyword=fleece+sheets+queen+deep+pocket
    • http://kagelasov.danielspero.com/uploads/1/3/1/4/131453284/wadoforo-wamozuko-gonubivusen-namatikaxiga.pdf
    • http://files.musicfromthewestcoast.com/uploads/1/3/0/7/130739616/5952019.pdf
    • http://files.sinandsatin.com/uploads/1/3/1/3/131383456/pokajuxelo.pdf
    • http://wepanobi.alfredharrisuk.com/uploads/1/3/0/7/130738799/1469248.pdf
    • http://files.robinskeylearning.com/uploads/1/3/2/6/132682564/buxegikas.pdf
    • http://jinalum.guamcycling.com/uploads/1/3/0/7/130775166/guwidumugijudu.pdf
    • http://files.mallratsofamerica.com/uploads/1/3/1/3/131398010/41e32d.pdf
    • http://files.nimblenotesmusic.com/uploads/1/3/2/7/132712234/3171150.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/3309/1480/files/lizuvetezedosujokax.pdf
    • https://cdn.shopify.com/s/files/1/0432/9367/1590/files/backup_android_phone_contacts_to_pc_free.pdf
    • https://cdn.shopify.com/s/files/1/0480/9388/8676/files/42093806172.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/949986333.pdf
    • https://cdn.shopify.com/s/files/1/0431/8278/4673/files/sidoxelomudirido.pdf
    • https://6fb55e30-1b1b-4d04-b9b1-a6d0f71bfb7e.filesusr.com/ugd/8cbfce_608d60f2ffc348c887be8034976010f0.pdf?index=true
    • https://40d8c60f-610e-4702-9fb0-67e84af884dd.filesusr.com/ugd/7be1cd_e715ddac80c94cefa4947a8ce1cb943d.pdf?index=true
    • 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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cf0f.bin
ad42de1672cf6d561beca62752874ba73636dde8b71d75a6f5329fb06372676d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCF0F 5000 bytes
font_01_sfnt_off0000e012.bin
3d122ca30626ca43738179bbd4c024a7a6a3b6046c81f7297f0a76b78166dd50		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE012 11412 bytes

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