Malicious PDF — malware analysis report

Static analysis result for SHA-256 087f70768f76b287…

MALICIOUS

PDF

40.2 KB Created: 2020-09-20 14:00:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 335ae708d5bc658e1693d7556b6ea379 SHA-1: 8c63ae52bed86fc40310c6a06a8971fa7b6d3f10 SHA-256: 087f70768f76b2877e1ff136cf78c4f1471ae0c04db3947b767c523fc162f851
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to external resources, suggesting a link farm or SEO abuse tactic. One critical heuristic identified a link to known malicious redirector infrastructure, specifically `https://ttraff.link/wix?keyword=geometry+2+trigonometry+test+review+answers`. The document body, though heavily obfuscated, contains this same URL, indicating the primary intent is to redirect users to potentially harmful content. No scripts were extracted, but the presence of numerous links and the malicious redirector strongly suggest a phishing or redirection attack.

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=geometry+2+trigonometry+test+review+answers
    • http://files.consoltech.org/uploads/1/3/0/8/130814078/9893829.pdf
    • http://zimijibi.hounslowpensionersforum.org/uploads/1/3/0/7/130776447/1701922.pdf
    • http://juwovagu.hopesecondarylibrary.com/uploads/1/3/1/4/131406717/fotafupisalumel.pdf
    • http://files.optmlacad.com/uploads/1/3/1/3/131382092/baboliv_fixiwemegasulo_jajovo.pdf
    • http://files.scrappingfairy.net/uploads/1/3/0/7/130738914/kanotuxadinivuvas.pdf
    • http://fontawesome.iohttp://fontawesome.io/license/
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/8032/7076/files/renaronepub.pdf
    • https://cdn.shopify.com/s/files/1/0434/1058/7800/files/republicain_lorrain_necrologie_pienn.pdf
    • https://cdn.shopify.com/s/files/1/0429/3269/9302/files/the_doctrine_of_grace_in_the_apostolic_fathers.pdf
    • https://cdn.shopify.com/s/files/1/0438/6160/6550/files/high_frequency_oscillatory_ventilation_in_neonates.pdf
    • https://cdn.shopify.com/s/files/1/0437/9898/6909/files/riwujerozurajiku.pdf
    • https://c54be660-d24f-4c64-91e1-e8bc6fe122b6.filesusr.com/ugd/20d83a_bbca0ab079c747a2bcebfeb12082da7f.pdf?index=true
    • https://a5e10b79-4a6c-459d-9080-e34d9a38a5b9.filesusr.com/ugd/1fbf8b_afdbd90f3e6c44cc97cad53b6d89ef6b.pdf?index=true
    • https://e34ab25b-f57c-4c8b-805e-43abef05151e.filesusr.com/ugd/81cd61_1c46ba5adc4347049af3c17f22d4961f.pdf?index=true
    • https://af802943-0a86-4bef-9c40-80c789df71ee.filesusr.com/ugd/6203b9_2b8bfeded6894e95ba3bdf9540738a1e.pdf?index=true
    • https://303d7633-a2ec-49f3-8f1b-d6b6899949a2.filesusr.com/ugd/7ab50f_8bf98c4a188b4f82ad6c916ebd56457b.pdf?index=true
    • https://447c4536-5d05-4710-99b6-80282488edb0.filesusr.com/ugd/db1da1_d2d77a4141b4481cb45d34d0f32165f7.pdf?index=true
    • https://72bb46a9-4c50-4bef-87c2-6f1f9e0a5803.filesusr.com/ugd/58a813_1d77f2a957ff4b9c8603cdb27c9fe424.pdf?index=true
    • https://9e329d5b-b930-4acf-9e3e-3e10b4d27290.filesusr.com/ugd/7e84b7_4fd5f17e4eb84422aef62af566fd321b.pdf?index=true
    • https://20f63f31-19e8-4d91-83e0-11b01421e873.filesusr.com/ugd/e5412a_da715d3010894c88931b3db985af5900.pdf?index=true
    • https://bf9c6616-cc26-46fd-b7ea-33d8b5b1aa28.filesusr.com/ugd/5f5755_424eaf49b0c54a19b2b9b6e470aca974.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000054d0.bin
a706874ddd052ab2df5e792c6428adf830c98bcc3e6b66fbf396f9e1db8dc665		 pdf-font-stream PDF embedded font (sfnt) at offset 0x54D0 2244 bytes
font_01_sfnt_off00005ed6.bin
d391f6432c91f6801521f1b095bb6ec27372aec0833c54870ddd952dcb001130		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5ED6 5388 bytes
font_02_sfnt_off00007138.bin
710f324f5254fc14c631e5345a775ef7ce6544ef6bf9e34cfedc9f406fc96ce2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7138 9944 bytes

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