Malicious PDF — malware analysis report

Static analysis result for SHA-256 b0d343afa249e593…

MALICIOUS

PDF

41.5 KB Created: 2020-08-21 11:42:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f6a53650a7a372babf89553e946cd16c SHA-1: f4c8973f3b758542f4ad68198a3d09df79ba496e SHA-256: b0d343afa249e593a138a0fed755894bd2987d9b9673c0627f234b4ab757b94a
152 Risk Score

Malware Insights

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

The PDF document was flagged by a critical heuristic for linking to known malicious redirector infrastructure. Additionally, it contains a large number of embedded links, many pointing to external resources, indicating a potential link farm or SEO manipulation tactic. The ML classifier also strongly indicated maliciousness. No scripts were extracted, but the sheer volume of links and the presence of a malicious redirector suggest the primary goal is to lure users to 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.ru/pify?keyword=edtpa+templates+2017
    • http://files.hypopara-awarenessday.com/uploads/1/3/0/9/130969150/806095.pdf
    • http://files.twotailsdogwalking.co.uk/uploads/1/3/1/0/131070572/806395.pdf
    • http://files.tifihair.net/uploads/1/3/1/4/131406893/5c8e7892.pdf
    • http://files.henryhomes.site/uploads/1/3/0/7/130739991/nifafobufogufas.pdf
    • https://cdn.shopify.com/s/files/1/0433/5396/4712/files/disney_pumpkin_carving_templates_free_printable.pdf
    • https://cdn.shopify.com/s/files/1/0435/1157/8776/files/asus_z170-_a_drivers.pdf
    • https://cdn.shopify.com/s/files/1/0429/5317/9289/files/tozogubed.pdf
    • https://cdn.shopify.com/s/files/1/0439/9644/6878/files/typwriter_sound_effect.pdf
    • https://cdn.shopify.com/s/files/1/0433/4583/8232/files/62869193061.pdf
    • https://cdn.shopify.com/s/files/1/0430/1042/4993/files/tisikojukafewa.pdf
    • https://cdn.shopify.com/s/files/1/0431/2832/4257/files/customer_behaviour_definition.pdf
    • https://cdn.shopify.com/s/files/1/0437/3128/8218/files/25030312639.pdf
    • https://cdn.shopify.com/s/files/1/0432/2417/0664/files/gotugapa.pdf
    • https://cdn.shopify.com/s/files/1/0432/4474/8950/files/5630410615.pdf
    • https://cdn.shopify.com/s/files/1/0430/6678/5949/files/siwuwufikekik.pdf
    • https://cdn.shopify.com/s/files/1/0429/5491/5993/files/possessive_adjectives_exercises_for_elementary.pdf
    • https://cdn.shopify.com/s/files/1/0436/9471/9131/files/40527530887.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_off000064e8.bin
569e7c4cb380ed329ff8321f727b7d929c0969e3860a6dd3f04980c584b639b0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x64E8 5372 bytes
font_01_sfnt_off00007730.bin
7a650a6b02122b1e4623d20bf024de5f78b5845607d8f1579402ad95425564ee		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7730 10016 bytes

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