Malicious PDF — malware analysis report

Static analysis result for SHA-256 f600a22135f4fab8…

MALICIOUS

PDF

45.0 KB Created: 2020-09-19 03:23:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d87044c0de60b8038b33f7ad4dd975d0 SHA-1: c7f233133c325319b65bc0a7103d85981136870c SHA-256: f600a22135f4fab883942c070e9c26de759359f7979882e1db62a9e35103dc35
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a prominent link that redirects to a URL associated with malicious redirector infrastructure, specifically advertising a download for 'http injector for pc free download'. The PDF also exhibits characteristics of a link farm, with numerous embedded URLs pointing to external PDF files, likely for SEO manipulation or to host further malicious content. The ML classifier strongly supports the malicious nature of this PDF.

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.club/wix?keyword=http+injector+for+pc+free+download
    • http://files.gwinnettrose.org/uploads/1/3/2/6/132683137/6819825.pdf
    • http://files.professorcole.com/uploads/1/3/2/6/132682802/6896759.pdf
    • http://files.generationjobless.eu/uploads/1/3/1/4/131437172/mavimigugez.pdf
    • http://files.synergy-african.com/uploads/1/3/1/8/131855981/2599669.pdf
    • http://files.kawarthafootclinic.com/uploads/1/3/2/8/132814166/7599963.pdf
    • http://files.spencerfamilychurch.org/uploads/1/3/2/8/132815785/sojagipeboxija-zewiwomalux-tifaletas.pdf
    • http://files.jordansidfield.com/uploads/1/3/0/8/130814980/xuzused.pdf
    • http://monif.homewoodmanitoba.com/uploads/1/3/1/4/131407241/957695bdea4e.pdf
    • http://files.dsusmusic.com/uploads/1/3/1/1/131164573/zuvofobamapuxijod.pdf
    • https://13ee312a-8508-4fb3-b2c1-702c97686845.filesusr.com/ugd/516574_4ea507253dfb4cc6a7c0885171132188.pdf?index=true
    • https://aecaf3d5-6ab4-4463-9ef3-0cf7786b6411.filesusr.com/ugd/2072cd_f40326eb6b034dc6a656b038ec3f88ca.pdf?index=true
    • https://8a218efe-4af4-4723-97bb-fcdf3a8cb7ef.filesusr.com/ugd/69695d_33e5dd1d49dc425eaf4bdb40fab05f6d.pdf?index=true
    • https://8539af82-a8ab-4497-930c-bf3a30fdd954.filesusr.com/ugd/30ea26_1d7b1427044e4cb6a7d402a6c1fb6761.pdf?index=true
    • https://84b4bbdf-572b-47e9-b286-c7700edfccca.filesusr.com/ugd/9f69bd_799092720a8a442bb48646f019a320a4.pdf?index=true
    • https://d33b4733-3d6f-44be-87dc-a9c37c73cdc7.filesusr.com/ugd/7598fa_b69e0a40baf948f3985115d915ba6693.pdf?index=true
    • https://004d7856-14ae-49fe-b350-f3b79c842a8d.filesusr.com/ugd/9b7d8a_18206795dc164e02af370f6370607d17.pdf?index=true
    • https://5e3404c4-90ad-4d4a-b24b-347b20c2b508.filesusr.com/ugd/668a47_07930ae5a23d4efd885694468cee481a.pdf?index=true
    • https://de8998ee-8d11-41ac-a4b4-9d3ef159d159.filesusr.com/ugd/948cea_46cae5a880394dfba1fe0db87fb44a48.pdf?index=true
    • 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/
    • https://aecaf3d5-6ab4-4463-9ef3-0cf7786b6411.filesusr.com/ugd/2

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000071e9.bin
cd4a8fe38b0d2cce7234db7c70dc1eb4bde379e963aa746b0e9b5d15e3501af0
pdf-font-stream PDF embedded font (sfnt) at offset 0x71E9 5100 bytes
font_01_sfnt_off00008367.bin
b998c2bed3bd9ca8be1a52c8a265c9e432821a15f4d184bdefdd8183543d3dce
pdf-font-stream PDF embedded font (sfnt) at offset 0x8367 10236 bytes