Malicious PDF — malware analysis report

Static analysis result for SHA-256 e251b0e1582aec9f…

MALICIOUS

PDF

48.1 KB Created: 2020-08-19 16:04:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0bb59f90956e2c4aa140580b8ae9ff62 SHA-1: 2d17589a2dae13f0cad7aef88c7c6ef7bc7de383 SHA-256: e251b0e1582aec9fa7179150f658dfb234522eebead19ffe7903461902d4991c
152 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with a critical heuristic firing indicating a link to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains the URL 'https://ttraff.com/pify?keyword=coffee+bar+video+song+free', suggesting a lure to a malicious site. The presence of multiple Shopify-hosted PDF links, while some are benign, contributes to a link farm strategy. The ML classifier strongly flagged this PDF as malicious.

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.com/pify?keyword=coffee+bar+video+song+free
    • http://batexe.alexified.com/uploads/1/3/1/4/131438641/zitifi_finunowozes.pdf
    • https://cdn.shopify.com/s/files/1/0434/0157/6602/files/briscola_regole.pdf
    • https://cdn.shopify.com/s/files/1/0433/6926/7354/files/jilajebiponajirefuwodajow.pdf
    • https://cdn.shopify.com/s/files/1/0458/3089/7827/files/azur_lane_equipment_guide.pdf
    • https://cdn.shopify.com/s/files/1/0432/4248/7972/files/dejud.pdf
    • https://cdn.shopify.com/s/files/1/0431/3841/6801/files/69457222426.pdf
    • https://cdn.shopify.com/s/files/1/0439/0522/0776/files/general_caste_reservation_form.pdf
    • https://cdn.shopify.com/s/files/1/0431/0509/1745/files/ragigoxewikapeju.pdf
    • https://cdn.shopify.com/s/files/1/0429/8031/1203/files/arithmetic_and_geometric_progression_download.pdf
    • https://cdn.shopify.com/s/files/1/0428/1312/8863/files/final_fantasy_ix_guide.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_off00007e39.bin
43ec21b8b206e8dd622f233cdfea2d516f25a5ed33674d65a4fa10653e23d658		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7E39 5148 bytes
font_01_sfnt_off00008fd0.bin
88a4356e75b4acead5fc4d05f768600d71b15a05c1fcb192815756684315376b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8FD0 10544 bytes

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