Malicious PDF — malware analysis report

Static analysis result for SHA-256 646e389f5ed4296b…

MALICIOUS

PDF

51.2 KB Created: 2020-08-11 16:21:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: de7fe95e10400861de9a58279618c9e5 SHA-1: 0968e345b624b5a664d91d25475c7559366fb31a SHA-256: 646e389f5ed4296b6d5ca6619f34eec397db151b23ddd773832abf1ed2d84810
154 Risk Score

Malware Insights

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

The PDF contains numerous links, with a critical heuristic identifying a link to known malicious redirector infrastructure. The document body, though obfuscated, contains a URL that appears to be the primary lure. The ML classifier strongly indicates maliciousness, and the presence of embedded links suggests an attempt to redirect users to potentially harmful sites, likely for phishing or malware delivery.

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=eulerian+numbers+petersen+pdf
    • http://mewibep.lifelybali.com/uploads/1/3/0/7/130738836/rokatedaratari-butimodagig-gokabul-guwizoluw.pdf
    • http://files.mpacf.shop/uploads/1/3/0/9/130969754/wefovedopad_sixunil.pdf
    • http://files.centrosapienti.com/uploads/1/3/1/6/131606202/xuzilevipomo.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0429/7015/3113/files/12033395307.pdf
    • https://cdn.shopify.com/s/files/1/0432/9704/6696/files/janodav.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/mozesuseb.pdf
    • https://cdn.shopify.com/s/files/1/0434/5665/9621/files/jirejabexijereg.pdf
    • https://cdn.shopify.com/s/files/1/0431/2937/2832/files/mazatuwaser.pdf
    • https://cdn.shopify.com/s/files/1/0432/5294/0968/files/30712653373.pdf
    • https://cdn.shopify.com/s/files/1/0431/8153/9483/files/bitefasodewono.pdf
    • https://cdn.shopify.com/s/files/1/0434/8618/3577/files/precalculus_textbook_demana.pdf
    • https://cdn.shopify.com/s/files/1/0439/3612/0990/files/changing_to_word_document_online.pdf
    • https://cdn.shopify.com/s/files/1/0440/2823/1830/files/fish_farming_books_in_urdu.pdf
    • https://cdn.shopify.com/s/files/1/0431/6292/7253/files/commandant_s_reading_list_2020.pdf
    • https://cdn.shopify.com/s/files/1/0430/0180/7007/files/94383171348.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006b66.bin
b2e3edff732a24e8e91a642ff94e870d8093bcce3136958bd4c74ef6e6264736		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6B66 5284 bytes
font_01_sfnt_off00007d39.bin
8cc2dd70f35d2b092fcf4be62805dbeff1df2f128664e87d7304e52dd0f5cdd0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7D39 13976 bytes
font_02_sfnt_off0000aa27.bin
1f5b0b48d011de472dc2181564d90ad522325fe034994414c55550010d0925d3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAA27 16276 bytes

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