Malicious PDF — malware analysis report

Static analysis result for SHA-256 555080ba93ad1abf…

MALICIOUS

PDF

47.1 KB Created: 2020-10-27 01:41:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fa78f57b849b6c726a6a2155eaa4bc71 SHA-1: 9019e0dac584bac8c95ca2ad0657691debfeaa6a SHA-256: 555080ba93ad1abf388b49f9e808763b9cfee035bbbc3345a1b7911a0b9ad37d
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, identified as a link farm, with one critical link pointing to known malicious redirector infrastructure. The ML classifier also strongly flagged this PDF as malicious. The embedded links likely serve to distribute traffic or lead users to malicious content.

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://gettraff.ru/123?keyword=basics+of+biblical+hebrew+answer+key
    • https://cdn-cms.f-static.net/uploads/4368249/normal_5f95b21eb80f9.pdf
    • https://cdn-cms.f-static.net/uploads/4369305/normal_5f8b339523d12.pdf
    • https://cdn-cms.f-static.net/uploads/4393028/normal_5f975e926824c.pdf
    • https://cdn-cms.f-static.net/uploads/4381730/normal_5f9628345d531.pdf
    • https://cdn-cms.f-static.net/uploads/4365545/normal_5f90d662d0bc7.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/kavitokolezub/counterfeit_gods.pdf
    • https://s3.amazonaws.com/ropuba/airbrush_magazine_free_download.pdf
    • https://s3.amazonaws.com/magapeguwabe/23899557204.pdf
    • https://cdn.shopify.com/s/files/1/0479/7172/9564/files/vomafisakoxomedurelevera.pdf
    • https://cdn.shopify.com/s/files/1/0437/3177/9738/files/19219234586.pdf
    • https://cdn.shopify.com/s/files/1/0431/9477/7757/files/70357806365.pdf
    • https://s3.amazonaws.com/memul/fobetatalelefig.pdf
    • https://s3.amazonaws.com/fonazuzixagizir/greek_mythology_gods.pdf
    • https://uploads.strikinglycdn.com/files/c7f1698f-99e8-405f-8cf8-527ba50360b5/kenot.pdf
    • https://uploads.strikinglycdn.com/files/e9228331-c911-4e06-bffc-312e406da507/jigajiselojenipow.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_off00006d82.bin
f35045c6b5f4e85566e7da37ec7a8db11f04898688fa9ea350689be3bbcd16f8
pdf-font-stream PDF embedded font (sfnt) at offset 0x6D82 5416 bytes
font_01_sfnt_off00007fed.bin
222c543e575408533a678d93545cfd113eb6adcf469c9fc691c8392b6da4f602
pdf-font-stream PDF embedded font (sfnt) at offset 0x7FED 15656 bytes