Malicious PDF — malware analysis report

Static analysis result for SHA-256 888b61417c528bb8…

MALICIOUS

PDF

59.6 KB Created: 2020-08-02 17:00:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cd5b8e8dbff3735415467afb486f9b52 SHA-1: 42a1dc260e3aec727040f9332dc835a348813c2a SHA-256: 888b61417c528bb86be75032d52799141b4354ef511b20eb70a19251e0e0f1ac
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 external PDF files, indicating a link farm or SEO manipulation tactic. One of the primary links, 'https://ttraff.cc/pify?keyword=cpu+c+states', is identified as a malicious redirector. The ML classifier also strongly flagged this PDF as malicious. No scripts were extracted, but the presence of a malicious redirector and a link farm suggests an attempt to lead the user to malicious content, likely for phishing or malware distribution.

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.cc/pify?keyword=cpu+c+states
    • http://files.trevorbennett.net/uploads/1/3/0/8/130873758/5497575.pdf
    • http://files.fairbanksfamilywellness.com/uploads/1/3/1/8/131856285/2016202.pdf
    • http://files.loblollylabradors.com/uploads/1/3/1/3/131382595/vivaninasa.pdf
    • http://files.musclecarsandclassiccruisers.com.au/uploads/1/3/0/9/130969218/bakudigodexenat_bepiraf_mitekafeketirav_gexolat.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/4952/5156/files/1402853651.pdf
    • https://cdn.shopify.com/s/files/1/0431/1010/5255/files/jirojuzipozuviwekuwibow.pdf
    • https://cdn.shopify.com/s/files/1/0433/9158/2357/files/minecraft_parkour_maps.pdf
    • http://files.alinken.people.ua.edu/uploads/1/3/0/7/130739678/f467322b73a.pdf
    • https://cdn.shopify.com/s/files/1/0428/7443/7791/files/32714818219.pdf
    • https://cdn.shopify.com/s/files/1/0433/4229/9295/files/87876569004.pdf
    • https://cdn.shopify.com/s/files/1/0430/5915/1009/files/88530228769.pdf
    • https://cdn.shopify.com/s/files/1/0431/9969/2958/files/kivufijigapifezimanam.pdf
    • https://cdn.shopify.com/s/files/1/0434/4384/7328/files/you_won_t_relent_chords.pdf
    • https://cdn.shopify.com/s/files/1/0427/5693/1751/files/sasuzujovinunasik.pdf
    • https://cdn.shopify.com/s/files/1/0429/6874/4087/files/62686473050.pdf
    • https://cdn.shopify.com/s/files/1/0431/0623/8613/files/75895403339.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_off0000a304.bin
543971dd79cb23546136ef7a38a4a797759b3ad3008985841ea1d153dd853527		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA304 4704 bytes
font_01_sfnt_off0000b315.bin
f5186055592ed71a0b017f5eb7889f91a4740612a0e7b57c6c1495f0d270221e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB315 14880 bytes

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