Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f2f6d6771754a99…

MALICIOUS

PDF

44.7 KB Created: 2020-09-19 04:40:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fa9a30dc407c68db25308995a81390b7 SHA-1: 91eb6b41990332993e484ecea03f79f9c77d6d1e SHA-256: 3f2f6d6771754a99efddfa1da999b4bf0fdd67f89ff7eac69d89b4f6446e63c4
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 User Execution: Malicious Link

The PDF was flagged as malicious by an ML classifier and contains a critical heuristic indicating it links to known malicious redirector infrastructure. Additionally, it exhibits characteristics of a PDF link farm, with numerous embedded URLs pointing to external resources. The document body contains obfuscated text and embedded URLs, suggesting an attempt to disguise malicious content.

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.link/wix?keyword=beowulf+graphic+novel+gareth+hinds+pdf
    • http://gapoto.redwood4h.org/uploads/1/3/0/9/130969525/nanuva_xofol_zurobuxelupete_jodidabitito.pdf
    • http://tetejog.maryellenhaupert.com/uploads/1/3/0/8/130874254/famedovufilov.pdf
    • http://files.biffandbaba.com/uploads/1/3/1/4/131482878/mezuzenizobenut_laxad_dawel.pdf
    • http://files.mostlymaille.com/uploads/1/3/2/6/132695867/pazidugifatutezexu.pdf
    • https://cdn.shopify.com/s/files/1/0431/5771/7143/files/chocolate_cake_jawani_video_song.pdf
    • https://cdn.shopify.com/s/files/1/0428/9419/6902/files/aha_guidelines_for_sbe_prophylaxis.pdf
    • https://cdn.shopify.com/s/files/1/0432/2548/1379/files/beginner_piano_book_for_adults.pdf
    • https://cdn.shopify.com/s/files/1/0430/4617/4877/files/kagozimovor.pdf
    • https://cdn.shopify.com/s/files/1/0428/2266/4348/files/girumod.pdf
    • https://cdn.shopify.com/s/files/1/0440/5395/4710/files/welotokajupazov.pdf
    • https://cdn.shopify.com/s/files/1/0432/3888/3485/files/tupisamuvozemerosu.pdf
    • https://cdn.shopify.com/s/files/1/0429/2427/7923/files/necron_6th_edition_codex.pdf
    • https://e4ab7f60-d675-425e-8c8c-8d2df397f30f.filesusr.com/ugd/d5415a_9fbe57dd20a84c17847624ce035d381c.pdf?index=true
    • https://15f0c75b-a203-4ef5-89f2-40811ab3e063.filesusr.com/ugd/5a1791_644010c1c2b2475e87f9e9ca4675d5f7.pdf?index=true
    • https://129b40a3-b93f-4b64-80fd-c9e885e6a534.filesusr.com/ugd/c4ccc4_4c0d2abd91844e8a8e93509fd4cd1443.pdf?index=true
    • https://22a73363-48e3-450e-89e1-f70ccc7cdf0e.filesusr.com/ugd/3f80ec_cae1ab04b3b44cea8aea25229911ce85.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/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006e13.bin
2bf186741924c41d2e2bb2f80ca0189f9ab4578a74f8c76e9e9c835dd6bd6179		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6E13 5620 bytes
font_01_sfnt_off00008148.bin
236a68bf0cda70d83152f3e14ee09fe332373d17ec4097daba2a74e71ab53bbc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8148 10688 bytes

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