Malicious PDF — malware analysis report

Static analysis result for SHA-256 6cfdf7fddfa8a336…

MALICIOUS

PDF

40.8 KB Created: 2020-10-03 08:43:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b16e4ddabf60a2406d6c8fa8213ac84b SHA-1: 2ea08727e63b6a8b9a73feba5c93952c9acca1b2 SHA-256: 6cfdf7fddfa8a336d522f3e26bd8db13da8cf7cb133d66ccf69dd0143fac9617
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one specifically identified as a malicious redirector. The ML classifier also flagged the document as malicious. The presence of a large number of external PDF links suggests a link farm or a mechanism to distribute further malicious content, likely initiated by a user clicking on one of the embedded links.

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://ggtraff.ru/strik?keyword=canard+pc+hardware+41+pdf+download
    • http://files.aznursemidwives.org/uploads/1/3/1/6/131636632/5545697.pdf
    • http://mozij.smaexhibition-self.org/uploads/1/3/1/4/131408371/a77d0d.pdf
    • http://zunevipi.monthlyphysicalchallenge.com/uploads/1/3/1/1/131163991/53d900e2712d50.pdf
    • http://jolumawur.shelleyburgoyne.co.uk/uploads/1/3/1/4/131483372/361d22a5012077.pdf
    • http://jegusidul.tangodelalma.co.nz/uploads/1/3/1/4/131437130/51153fef.pdf
    • http://files.the-regular.com/uploads/1/3/0/7/130776063/8410293.pdf
    • http://files.bbpregistry.com/uploads/1/3/0/7/130776812/givuzikamagununaj.pdf
    • http://files.tomdexter.com/uploads/1/3/0/7/130776123/2714888.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/6fa52e0f-abf4-4bca-8ebb-350258a97f34/80202039300.pdf
    • https://uploads.strikinglycdn.com/files/3ebe8b93-f0db-44e7-be91-c629dd77a6be/natisufosejoto.pdf
    • https://uploads.strikinglycdn.com/files/067aef50-f8fa-4053-bfb9-72d81de9b4ed/45726494890.pdf
    • https://uploads.strikinglycdn.com/files/9aaebba5-ecfb-4d1b-afac-0ece493aac28/9330550455.pdf
    • https://uploads.strikinglycdn.com/files/e507583a-040a-49ef-ac7a-aac122444fd5/48989531527.pdf
    • https://uploads.strikinglycdn.com/files/4f933f9f-9bda-4ad1-b4ee-3240caf08fda/6905745332.pdf
    • https://uploads.strikinglycdn.com/files/052d9568-d72a-4473-928f-2e9bf36ac3ec/54799819659.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_off000061c7.bin
5bcee24666ddada24219d95d71becee4183a056978a41df60c7aaf9c3107afe3
pdf-font-stream PDF embedded font (sfnt) at offset 0x61C7 5204 bytes
font_01_sfnt_off00007393.bin
f9f15928d13f635c2021124da7fb9481c15c6a1db3dae19a3a49657e26d46984
pdf-font-stream PDF embedded font (sfnt) at offset 0x7393 10152 bytes