Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a66f7cbb33f9545…

MALICIOUS

PDF

42.7 KB Created: 2020-08-11 05:24:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c3d8de07c501273ccacec967a6d31242 SHA-1: b5cfe41541fd37747ae25b7fb14a810e968bc542 SHA-256: 6a66f7cbb33f9545f6782414658203c6e962afb040d676ffe7cd73fcf86397ea
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one specifically pointing to a known malicious redirector. The document body, though heavily obfuscated, includes the same URL, suggesting a lure to a phishing or malware distribution site. The ML classifier also strongly indicated maliciousness.

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.cc/pify?keyword=automotive+can+bus+training+pdf
    • http://files.joelovesyou.de/uploads/1/3/0/7/130775009/3118259.pdf
    • http://files.southkeyscentrum.com/uploads/1/3/2/7/132740743/6087896.pdf
    • http://foxepixo.scholacincinnati.org/uploads/1/3/0/9/130969465/sulesavepopa-berafu.pdf
    • http://files.northcentralcivitans.org/uploads/1/3/1/4/131408142/6798355.pdf
    • http://files.artbycjroughton.com/uploads/1/3/1/3/131380263/ferexozamixugi.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0429/5743/9129/files/the_everything_kids_learning_french_book_download.pdf
    • https://cdn.shopify.com/s/files/1/0429/2087/0044/files/peter_pan_novel_pdf_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/kofuka.pdf
    • https://cdn.shopify.com/s/files/1/0437/0884/2152/files/44434855847.pdf
    • https://cdn.shopify.com/s/files/1/0428/9685/1103/files/90286622487.pdf
    • https://cdn.shopify.com/s/files/1/0434/2484/1890/files/larasuz.pdf
    • https://cdn.shopify.com/s/files/1/0429/3358/4035/files/auto_key_presser_for_roblox.pdf
    • https://cdn.shopify.com/s/files/1/0439/1688/6184/files/limibemonibivudirure.pdf
    • https://cdn.shopify.com/s/files/1/0432/3577/0535/files/matrix_multiplication_algorithm.pdf
    • https://cdn.shopify.com/s/files/1/0431/8281/7441/files/ashrae_handbook_hvac_systems_and_equipment_2020.pdf
    • https://cdn.shopify.com/s/files/1/0429/5937/2439/files/discord_server_ideas.pdf
    • https://cdn.shopify.com/s/files/1/0432/1745/3211/files/abacus_bula.pdf
    • https://cdn.shopify.com/s/files/1/0431/6289/4498/files/54814143069.pdf
    • https://cdn.shopify.com/s/files/1/0428/3724/6118/files/25710947770.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000682d.bin
11ee2a1408818ae5a130322a80af22048d083bc478f9e9fa4a5a0f37aedfb680		 pdf-font-stream PDF embedded font (sfnt) at offset 0x682D 5632 bytes
font_01_sfnt_off00007b39.bin
045a5bfc59a2a04753e6d1aea354738bc838e5159e298ee9c0e0efd68d4dc89a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7B39 9964 bytes

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