Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a8b336c5fa1e553…

MALICIOUS

PDF

34.8 KB Created: 2020-09-17 00:07:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 93ff78d040d1564637a3b9c8d776f510 SHA-1: 07feb1ffc169975dbc36e230fdc11fdad8f6e926 SHA-256: 5a8b336c5fa1e55381530f4ad753f67131ef5e918c375928703efda6de4a9b8e
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'https://ttraff.club/wix?keyword=bowflex+treadclimber+tc5000+service+manual'. This URL is likely used to redirect users to a malicious site as part of a phishing or scam campaign. The document body, though heavily obfuscated, contains references to the service manual lure and the malicious URL, reinforcing the phishing attempt. The presence of numerous other PDF links, many pointing to benign Shopify URLs, suggests a link farm or SEO manipulation tactic to obscure the malicious redirect.

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.club/wix?keyword=bowflex+treadclimber+tc5000+service+manual
    • http://fisiti.rzecoseal.net/uploads/1/3/0/7/130776225/zabenirutixukiw_butiwiposolato.pdf
    • http://files.jeanfahmy.com/uploads/1/3/1/4/131407767/xulodotal-mezado-zazupifojo-sogutunujax.pdf
    • http://files.preptheday.com/uploads/1/3/0/7/130775429/taxawu.pdf
    • http://rorira.pezzlawncare.com/uploads/1/3/0/9/130969644/sijineza_jakabebe.pdf
    • http://supefuvab.phillipsandphillipsmusic.com/uploads/1/3/0/8/130813694/jexufasawumakevatane.pdf
    • http://popuxiwi.portagewarriorfb.com/uploads/1/3/1/6/131636664/5823362.pdf
    • http://files.mattandmaries.com/uploads/1/3/0/7/130775503/sovukinewilulof.pdf
    • http://files.caseyscurbside.com/uploads/1/3/0/9/130969656/kotow_vebowul_pifojuruvefile_valeme.pdf
    • http://files.adamhager.com/uploads/1/3/0/7/130740524/19bdbcc11b.pdf
    • http://bigedaji.dandimicco.com/uploads/1/3/1/4/131453541/2575428.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0428/6958/8124/files/22892397609.pdf
    • https://cdn.shopify.com/s/files/1/0434/4306/0901/files/building_construction_book.pdf
    • https://cdn.shopify.com/s/files/1/0439/0413/9416/files/brawl_stars_apk_2018.pdf
    • https://cdn.shopify.com/s/files/1/0485/1925/0082/files/legend_of_zelda_second_quest_level_8_map.pdf
    • https://cdn.shopify.com/s/files/1/0431/9543/3117/files/gazetinigadux.pdf
    • https://22d377cc-1d24-4d66-b1bb-dc4131c56364.filesusr.com/ugd/c12414_73accb0eb427433d84112c5946df7fb4.pdf?index=true
    • https://5abf8ccd-784c-4a49-a8fc-ce1d3a940ffd.filesusr.com/ugd/89441e_c0fc6b9291b44fdd95e709d604fa73f7.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000047d9.bin
fed795d9e282281a62ad6b2aebe8ba7bc71becbb374eb784c6d1237cd82c7249		 pdf-font-stream PDF embedded font (sfnt) at offset 0x47D9 5844 bytes
font_01_sfnt_off00005bc4.bin
3a71bbf49e68739306d6e11b98a0328d74a7e1fe4b243e1a73632078bb532f42		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5BC4 10024 bytes

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