Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7bfb257b33b3ea2…

MALICIOUS

PDF

49.9 KB Created: 2020-08-20 19:28:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 36355426a176d15bdde1c95b9469590e SHA-1: 8b514bfb55de4d57b19ea19b88b4087a74406293 SHA-256: b7bfb257b33b3ea2d0fd25b50bc804b23f867f93bac86879595a052878de0675
152 Risk Score

Malware Insights

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

The PDF file contains numerous embedded links, with a critical heuristic identifying a link to known malicious redirector infrastructure. The ML classifier also strongly flagged this PDF as malicious. The document body, though heavily obfuscated, contains a URL that points to a redirector, suggesting the primary goal is to redirect the user to a malicious site. No scripts were extracted from this sample.

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=brainstorming+pdf+en+espa%25C3%25B1ol
    • http://bimeza.climbphilippines.com/uploads/1/3/1/4/131406709/02199e8de031.pdf
    • http://files.merrimackreview.com/uploads/1/3/1/4/131453555/d2772eb778b245.pdf
    • http://poriru.pamperandpreen.co.uk/uploads/1/3/1/3/131380213/zosipuvaposiso.pdf
    • http://nemunew.rabbifuchs.com/uploads/1/3/1/4/131406226/suzipedagabememegata.pdf
    • http://files.confluentdesign.net/uploads/1/3/2/6/132695216/xikutani.pdf
    • https://cdn.shopify.com/s/files/1/0433/6097/7048/files/5862598574.pdf
    • https://cdn.shopify.com/s/files/1/0451/4159/0170/files/positive_emotions_list.pdf
    • https://cdn.shopify.com/s/files/1/0437/3381/1351/files/ap_calculus_crash_course.pdf
    • https://cdn.shopify.com/s/files/1/0440/8049/6792/files/dixuwufipirafesulov.pdf
    • https://cdn.shopify.com/s/files/1/0434/2461/2509/files/mario_64_star_road.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/pelezegagujagemubejapo.pdf
    • https://cdn.shopify.com/s/files/1/0428/6336/2204/files/givupobesuzuve.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/rixaraxamixenapo.pdf
    • https://cdn.shopify.com/s/files/1/0440/8141/4296/files/moss_rock_pokemon.pdf
    • https://cdn.shopify.com/s/files/1/0434/1373/3533/files/jajif.pdf
    • https://cdn.shopify.com/s/files/1/0432/9422/8630/files/tezatozimegesubibibiwuka.pdf
    • https://cdn.shopify.com/s/files/1/0438/4620/5602/files/raxenalozasozikukited.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/pujipipokumamidepuw.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_off0000822e.bin
afcc2532ab060f6943dce754c82d32d2ba391f743f4a4c4c3f849101eee7242c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x822E 5624 bytes
font_01_sfnt_off000094f4.bin
2d087f3358bbbf412153826f776638754c401c37b61ce81f48a85be75538f18c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x94F4 10548 bytes

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