Malicious PDF — malware analysis report

Static analysis result for SHA-256 0aadce6de3344df6…

MALICIOUS

PDF

37.3 KB Created: 2020-08-12 18:50:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4bc00d34d36e10241b5d929bb5e3df28 SHA-1: 5ee31a680984c63054dda540184b16d9109f93cb SHA-256: 0aadce6de3344df6737e140e3b35aafced60ca8c501ad2a1fdc9dfac9eccb8e4
154 Risk Score

Malware Insights

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

The PDF contains embedded links that redirect to a known malicious URL, masquerading as a cooling tower catalogue. The ML classifier strongly indicates maliciousness, and the presence of numerous external PDF links suggests a link farm or SEO poisoning attempt. No scripts were extracted, but the primary malicious activity observed is the redirection to a malicious site.

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=marley+cooling+tower+catalogue+pdf
    • http://files.kfbca.com/uploads/1/3/0/8/130813988/lesirone_volajupiwivixud_lezazumefam_nubow.pdf
    • http://gelimona.iamenoughwithgod.com/uploads/1/3/1/0/131070450/8434169.pdf
    • http://files.onlinechampionshipwrestling.com/uploads/1/3/2/6/132682883/740245.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0441/2047/3752/files/jepegabolizadedamuper.pdf
    • https://cdn.shopify.com/s/files/1/0438/6871/7216/files/helcular_s_revenge_vanilla.pdf
    • https://cdn.shopify.com/s/files/1/0433/3027/3448/files/jurassic_park_theme_song_piano_sheet_music.pdf
    • https://cdn.shopify.com/s/files/1/0431/2144/2977/files/standard_costing_vs_budgetary_control.pdf
    • https://cdn.shopify.com/s/files/1/0430/0872/1045/files/speaking_activities_for_esl.pdf
    • https://cdn.shopify.com/s/files/1/0431/1567/5809/files/losoviwubobakezo.pdf
    • https://cdn.shopify.com/s/files/1/0433/7595/2030/files/apc_smart_ups_2200_tower_manual.pdf
    • https://cdn.shopify.com/s/files/1/0430/9401/6157/files/65992568543.pdf
    • https://cdn.shopify.com/s/files/1/0440/5038/2998/files/wumitenegeletokedi.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/58097506778.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/wawufomujemozinabewa.pdf
    • https://cdn.shopify.com/s/files/1/0431/7331/4715/files/38675501444.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005245.bin
8a7aec69435acd6378bfeba151a9305ed86400f28ca75b52bfcb366e94ae862d
pdf-font-stream PDF embedded font (sfnt) at offset 0x5245 5344 bytes
font_01_sfnt_off0000649f.bin
73d8c47a9d0ac650b29e6275df38bae2562c89d966b2bd2524177b06e01ed537
pdf-font-stream PDF embedded font (sfnt) at offset 0x649F 10604 bytes