Malicious PDF — malware analysis report

Static analysis result for SHA-256 783804bab05a4256…

MALICIOUS

PDF

40.5 KB Created: 2020-09-18 14:43:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c3f8ed23a2cf50ab6c8d54244c404223 SHA-1: 5be297461391682e9d23917090ea6c5587e69c60 SHA-256: 783804bab05a42562e5cd9011e7ffc5622e4840d9c4f2668543297c1cfe7672a
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with at least one pointing to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains a URL that appears to be part of a link farm or SEO manipulation scheme. The ML classifier strongly indicated maliciousness, supporting the interpretation that this PDF is designed to redirect users to harmful sites.

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=reproductive+system+matching+worksheet+answers
    • http://toboxiwot.nevadateach.com/uploads/1/3/2/6/132682076/kagat.pdf
    • http://files.floridalivesound.com/uploads/1/3/1/4/131452799/60457dcb62.pdf
    • http://files.ahandymommy.com/uploads/1/3/1/0/131070458/9684992.pdf
    • http://tuxosoxe.rami-khushaba.com/uploads/1/3/2/8/132815370/zumofulaxa_lekikasixu_kosofane_dukojuvemakudiz.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://6005bf7a-db45-4088-8cf3-497ad5a42d5b.filesusr.com/ugd/0cd019_0adf2a324b4a44dda790ec5c9d7fbe51.pdf?index=true
    • https://999c9b6c-4014-4720-8140-325b992f2f04.filesusr.com/ugd/08338c_0f42e8858bef4d8f9e917232f6c304cc.pdf?index=true
    • https://add3c6fe-da64-4d98-a4de-cb951288161b.filesusr.com/ugd/7d2910_e6d42b4ff8bb46ec8bbadece376e343f.pdf?index=true
    • https://3c2cc2cc-ea17-46d9-9b8d-89b3ca6a3c01.filesusr.com/ugd/29c71c_96f08a0f6d964a1e88730d016356b723.pdf?index=true
    • https://cdn.shopify.com/s/files/1/0463/4139/0492/files/farberware_deep_fryer_instruction_manual.pdf
    • https://cdn.shopify.com/s/files/1/0431/3179/7668/files/pekekojuwapa.pdf
    • https://cdn.shopify.com/s/files/1/0432/3291/9720/files/51818996797.pdf
    • https://cdn.shopify.com/s/files/1/0433/0559/9140/files/26505421692.pdf
    • https://cdn.shopify.com/s/files/1/0431/5217/9364/files/tevojozizotudekodowake.pdf
    • https://cdn.shopify.com/s/files/1/0483/9843/4461/files/chronicles_of_the_third_realm_war.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_off00005d13.bin
4456865510d92dd3651d5025503edaa12930d43ade41b6c970207f2befdc24ab		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5D13 5780 bytes
font_01_sfnt_off000070b5.bin
66a3d746b801409903cf45797d9349e7f892733344a4bec96417956907e453e9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x70B5 10460 bytes

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