Malicious PDF — malware analysis report

Static analysis result for SHA-256 13e04cd3052965ca…

MALICIOUS

PDF

52.0 KB Created: 2020-09-10 12:08:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 01131b2c3cf3f47d03da7da38485237b SHA-1: 7200001fa266292af0525f59939fdca604001ea4 SHA-256: 13e04cd3052965caf188b522bd108023305a4453adefbade09d33d90d448b7b8
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 suspicious domains and are likely part of a link farm designed to attract traffic. One critical heuristic indicates that a link points to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains a URL that appears to be the primary lure, directing users to a site related to 'virulence factors of salmonella typhi pdf'. No scripts were extracted, but the embedded links themselves serve as the malicious payload delivery mechanism.

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/wb?keyword=virulence%20factors%20of%20salmonella%20typhi%20pdf
    • http://files.weldonwitness.com/uploads/1/3/0/7/130739664/6656315fc4c6.pdf
    • http://files.take5reviews.ca/uploads/1/3/0/7/130776200/dutagigefe.pdf
    • http://makonad.kmarcus.net/uploads/1/3/1/3/131384609/ruvugutideziru_mobafuxevakeli_tixovewituvak.pdf
    • http://xinije.hemmerlab.com/uploads/1/3/1/1/131164250/nogusewusixokopasu.pdf
    • http://bexumeni.sheltontile.net/uploads/1/3/1/6/131637881/tokewalomuvagij.pdf
    • http://fubebi.afinomusic.com/uploads/1/3/2/7/132740405/991146.pdf
    • http://files.chriscraneportfolio.com/uploads/1/3/2/6/132681579/7514936.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://static.usrfiles.com/ugd/9ea91e_11b399c278774f88b263868f15442a06.pdf
    • https://static.usrfiles.com/ugd/a8c229_8a2fe6aa17814cecb6d9863525820a17.pdf
    • https://static.usrfiles.com/ugd/0a593f_4be5fe3b048b4a659661a532b7381059.pdf
    • https://static.usrfiles.com/ugd/d94ae5_4e08f41fa9da47b8ac4c0661b7e94dd2.pdf
    • https://static.usrfiles.com/ugd/67e251_6aadb1a146914600933dd78ae7e34f05.pdf
    • https://static.usrfiles.com/ugd/4329d7_4863eacac74645b89a4b25553bff2b5e.pdf
    • https://static.usrfiles.com/ugd/db1da1_f286e2b8be7d45a0b1b958c9c84f6b6f.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007e90.bin
dedba29d9b878d30ce8cafa0a9bd168c0d01520173b1aeea4db30e4e8143b8b7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7E90 5344 bytes
font_01_sfnt_off00009090.bin
8bb7fb4837416391a73490b0a03c57501750beb076eddc665ff5e690886b0538		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9090 11188 bytes
font_02_sfnt_off0000b4f0.bin
ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB4F0 4324 bytes

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