Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c21c7b79c3b285f…

MALICIOUS

PDF

119.8 KB Created: 2020-08-31 16:31:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b91ab63fb0b4b42780da910bff573887 SHA-1: b89bccd2c3b3d082d95838f4492e02b6cb1b7027 SHA-256: 7c21c7b79c3b285f71b230ebcd76e5c208103089d8081644e2514fdbc591539f
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to a link farm infrastructure. One of the primary URLs, 'https://ttraff.ru/wix?keyword=free+bhajan++site', is flagged as a malicious redirector. This suggests the document is designed to lure users to malicious websites, likely for phishing or malware distribution. No scripts were extracted, but the PDF structure itself facilitates the malicious redirection.

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/wix?keyword=free+bhajan++site
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0434/5197/3794/files/advanced_trainer_second_edition.pdf
    • https://cdn.shopify.com/s/files/1/0435/1701/8267/files/lebali.pdf
    • https://cdn.shopify.com/s/files/1/0438/6501/4432/files/mobile_legends_argus_guide_2018.pdf
    • https://cdn.shopify.com/s/files/1/0430/9434/3829/files/tajaruwof.pdf
    • https://cdn.shopify.com/s/files/1/0430/7088/1946/files/76751459790.pdf
    • https://cdn.shopify.com/s/files/1/0437/2194/9335/files/auditor_de_sistema_de_informacion.pdf
    • https://cdn.shopify.com/s/files/1/0430/5308/8919/files/hadoop_the_definitive_guide_latest_edition.pdf
    • https://cdn.shopify.com/s/files/1/0440/6909/3541/files/ketez.pdf
    • https://static.usrfiles.com/ugd/b8c837_556d75671216464e8d19ef758feb3b20.pdf
    • https://static.usrfiles.com/ugd/b8c837_8d49e5c5caf9482085299ed73482cb7e.pdf
    • https://static.usrfiles.com/ugd/a91264_91175e5999474a6d9c0414e86785f175.pdf
    • https://static.usrfiles.com/ugd/b8c837_356230d3c3694ca8af539d8cba9a1ce1.pdf
    • https://static.usrfiles.com/ugd/1a89c8_77c93ea862834c4ebe97b35b62e04999.pdf
    • https://static.usrfiles.com/ugd/73f3b0_db1ecfcfa2e4457cb731e098b5463e11.pdf
    • https://static.usrfiles.com/ugd/0ad6c7_17e41df9546744f69882ccd7d0b96e84.pdf
    • https://static.usrfiles.com/ugd/47b1e8_54a4be6f76834f22a5eadecf7ee81c07.pdf
    • https://static.usrfiles.com/ugd/a58b01_2861446a335d4972b8593b95a6d2b90e.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_off000193de.bin
cdca0ab2540a08c1605315036db2c7c7de691c2090d2ceb86addc67263e55484		 pdf-font-stream PDF embedded font (sfnt) at offset 0x193DE 4912 bytes
font_01_sfnt_off0001a492.bin
b6737a29a14a9d4c408a991e715f79f4e6e88c3d77ab83a2f3f8a83854876bdc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1A492 14772 bytes

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