Malicious PDF — malware analysis report

Static analysis result for SHA-256 090f16c4fd75e9ed…

MALICIOUS

PDF

36.3 KB Created: 2020-08-24 10:44:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 08255af71a1e3fa51a73874667e6b8ee SHA-1: fab66e84067d3f71b68294401c0acb8af60fe466 SHA-256: 090f16c4fd75e9ed4833bc370ff9c281a0db0fabd17375ec24ee5bc2b65fb026
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a large number of embedded links, many of which point to potentially malicious redirectors or link farms. The heuristic PDF_SEO_LINK_FARM indicates a mass external PDF link farm, and PDF_MALICIOUS_REDIRECTOR_LINK specifically flags a known malicious redirector. The ML classifier also strongly indicated maliciousness. These factors suggest the document's primary purpose is to redirect users to malicious 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.ru/pify?keyword=confluence+page+properties+report+column+width
    • http://files.melreese.com/uploads/1/3/1/1/131164431/jotiwumapugo-jawiponu.pdf
    • http://gonoma.cvltovcpop.com/uploads/1/3/2/7/132712358/sitazejulu-nevokaman-nanejiwijim-jegejavali.pdf
    • http://files.fjordsar.com/uploads/1/3/1/8/131871633/tetijejesuwefek-pafusetozowopa.pdf
    • http://surisat.michellelewisphotography.com/uploads/1/3/1/4/131438110/revivudidenoz_kuzuzefejaluso.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0438/2982/1602/files/fakedopufaguso.pdf
    • https://cdn.shopify.com/s/files/1/0431/9536/7585/files/32330359679.pdf
    • https://cdn.shopify.com/s/files/1/0430/0881/9349/files/54428390212.pdf
    • https://cdn.shopify.com/s/files/1/0432/0795/0495/files/usps_certified_mail_tracking_number_format.pdf
    • https://cdn.shopify.com/s/files/1/0436/2511/9904/files/hand_foot_and_mouth_disease_hfmd_guidelines.pdf
    • https://cdn.shopify.com/s/files/1/0429/1349/7247/files/grammar_worksheet_for_grade_5.pdf
    • https://cdn.shopify.com/s/files/1/0430/6072/3865/files/pawoxaje.pdf
    • https://cdn.shopify.com/s/files/1/0429/0704/1958/files/kotor_2_hk_parts.pdf
    • https://cdn.shopify.com/s/files/1/0430/6108/4322/files/94695096474.pdf
    • https://cdn.shopify.com/s/files/1/0431/1236/6229/files/beamng_drive_tech_demo_mods.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/mefopevepal.pdf
    • https://cdn.shopify.com/s/files/1/0434/6059/1776/files/ccna_cisco_certified_network_associate_study_guide_6th_edition.pdf
    • https://cdn.shopify.com/s/files/1/0435/3681/0152/files/fajenawisejumaxiginetig.pdf
    • https://community.atlassian.com/t5/Confluence-questions/How-can
    • 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_off00004df5.bin
9bc63351e5c9ffcbef4338b39a396608f5601e335ad115e748cef779c9a563a9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4DF5 5564 bytes
font_01_sfnt_off000060c4.bin
9c1c6b8741de717e416733c0a455f7b8813f7b478a749dcd3bdc70b71f58c7df		 pdf-font-stream PDF embedded font (sfnt) at offset 0x60C4 10304 bytes

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