Malicious PDF — malware analysis report

Static analysis result for SHA-256 75503a15113b052c…

MALICIOUS

PDF

47.8 KB Created: 2020-07-19 22:56:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 55683c667fda4189dbb536f28e937689 SHA-1: d80d96b998f06f67d963d56e29a672cf4dbee083 SHA-256: 75503a15113b052c1ed4901ab9d9d023d3ecca315b5293720e0c701ea9a7c70d
154 Risk Score

Malware Insights

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

The PDF contains a link to a redirector URL, which is part of a link farm designed to distribute malicious content. The ML classifier strongly indicates maliciousness. The document body, though heavily obfuscated, contains text related to a 'Cassandra database tutorial', likely a lure to disguise the malicious intent of redirecting users to potentially harmful websites.

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=cassandra+database+tutorial+for+beginners+pdf
    • http://files.frommairpad.com/uploads/1/3/1/4/131408854/b94a026b82033d.pdf
    • http://files.infinitely-natural.com/uploads/1/3/1/8/131871799/d81780cecd.pdf
    • http://files.jjkbarrelracing.com/uploads/1/3/0/7/130775859/1177648.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/1253/0081/files/19136486835.pdf
    • https://cdn.shopify.com/s/files/1/0430/9424/5537/files/rozafusuwodobinowopaloluj.pdf
    • https://cdn.shopify.com/s/files/1/0430/4217/7181/files/wijilaxizapi.pdf
    • https://cdn.shopify.com/s/files/1/0435/2756/9576/files/sanoxodaki.pdf
    • https://zujamawukige.files.wordpress.com/2020/07/55476264335.pdf
    • https://xikunere.files.wordpress.com/2020/07/83060399003.pdf
    • https://zawamibidixa.files.wordpress.com/2020/06/zunarufexiremaw.pdf
    • https://fuzevibob.files.wordpress.com/2020/07/14403434677.pdf
    • https://cdn.shopify.com/s/files/1/0428/6880/1695/files/nadupezopumatifawosisoji.pdf
    • https://cdn.shopify.com/s/files/1/0432/2508/8168/files/piligabudova.pdf
    • https://cdn.shopify.com/s/files/1/0429/5429/3402/files/napaxijala.pdf
    • https://cdn.shopify.com/s/files/1/0435/1701/8267/files/90582983867.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/45292738862.pdf
    • https://cdn.shopify.com/s/files/1/0430/4686/3005/files/94213073733.pdf
    • https://cdn.shopify.com/s/files/1/0431/9546/5892/files/90074553748.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_off00007d55.bin
6a808af0c687f84eba0056040047745f40c7d92a10e92cf28d38f90ebe10e25b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7D55 5256 bytes
font_01_sfnt_off00008f3a.bin
78731b2a186a0caa98130bee540973297c1421042d42fff9bdf7e1a374019c60		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8F3A 10212 bytes

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