Malicious PDF — malware analysis report

Static analysis result for SHA-256 acff8f344dd9555c…

MALICIOUS

PDF

60.6 KB Created: 2020-12-20 05:33:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fcd2e2602ab416e2dffc99c4db71878b SHA-1: 748737e5143f05325974028046997a1aace6c51c SHA-256: acff8f344dd9555c34c7d01eb950dfaa177e20b6cff56c0941386d8cf76a35fd
214 Risk Score

Malware Insights

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

This PDF file contains a large number of embedded links, many of which point to known malicious redirectors or link farms. The heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' indicates that at least one URL is known to lead to malicious infrastructure. The ML classifier also strongly flagged this PDF as malicious. The embedded links are likely intended to redirect users to phishing sites or download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://traffmen.ru/123?utm_term=vinayaka+stotram+in+telugu+pdf
    • https://cdn-cms.f-static.net/uploads/4372972/normal_5f99d41161b9e.pdf
    • https://subijiderekura.weebly.com/uploads/1/3/4/6/134616270/2859242.pdf
    • https://cdn-cms.f-static.net/uploads/4388842/normal_5f93541b13f6e.pdf
    • https://cdn-cms.f-static.net/uploads/4454819/normal_5fa52b1125a44.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/10085cb9-0e71-469b-8eec-7965edef85f4/234541775.pdf
    • https://uploads.strikinglycdn.com/files/eb1809a1-654c-4149-94cf-84c63c313b85/jafarufisanaliwuton.pdf
    • https://uploads.strikinglycdn.com/files/5458d3e5-0f3d-4e93-a787-f34bfe7359ab/mass_effect_3_prothean_obelisk.pdf
    • https://uploads.strikinglycdn.com/files/fc855d0d-85d3-4044-afb0-4090e0da8429/best_break_resistant_dinnerware.pdf
    • https://uploads.strikinglycdn.com/files/df740d77-0bad-4cbf-b1af-cd6824bb2007/mefajuzujisepebekesiwaso.pdf
    • https://s3.amazonaws.com/temujonuwu/mewuziligedelumeweke.pdf
    • https://uploads.strikinglycdn.com/files/950e829a-ea25-4a33-ba8e-0e24e60a6376/nuwazomikokerejelobidal.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_off0000b07f.bin
b9d6e17602f4fc26f875cae4ecb5ed77b0c3f5f612175d8480594d66fcbad89a
pdf-font-stream PDF embedded font (sfnt) at offset 0xB07F 5492 bytes
font_01_sfnt_off0000c32d.bin
49ce7c12c14e2f300adb968c5408310b6e33cb15651ce0065b7b83f6125f8138
pdf-font-stream PDF embedded font (sfnt) at offset 0xC32D 10812 bytes