Malicious PDF — malware analysis report

Static analysis result for SHA-256 f244632f8fd54c0a…

MALICIOUS

PDF

61.8 KB Created: 2020-11-10 21:13:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 20c8aebfdf47312761a4ee3d5fec116a SHA-1: 1c8d6992003715e2b7bcc599705d4bda5af7c735 SHA-256: f244632f8fd54c0afc8e20245db8034dc8be6c2e8ef2addd1b85f0d1959a5180
214 Risk Score

Malware Insights

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

The PDF contains a link farm and a specific malicious redirector URL, indicating an attempt to direct users to potentially harmful content. The heuristic firings, particularly 'PDF_MALICIOUS_REDIRECTOR_LINK' and 'ML_NYX_PDF_MALICIOUS', strongly suggest malicious intent. The document body, though partially corrupted, contains keywords related to in-game currency, aligning with a phishing or scam lure.

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://cctraff.ru/strik?keyword=hacks+to+get+more+money+on+nitro+type
    • https://fulojozizarotuv.weebly.com/uploads/1/3/4/3/134318677/5640396.pdf
    • https://pixuvanibodaw.weebly.com/uploads/1/3/4/3/134374857/mofimi.pdf
    • https://cdn-cms.f-static.net/uploads/4379029/normal_5fa3eb4548f90.pdf
    • https://wedebiki.weebly.com/uploads/1/3/0/9/130969436/legemome.pdf
    • https://pefopurez.weebly.com/uploads/1/3/4/3/134375846/newetafopixikoj.pdf
    • https://cdn-cms.f-static.net/uploads/4410433/normal_5f9f29d9d4832.pdf
    • https://kitovipafabezed.weebly.com/uploads/1/3/4/6/134600887/a444569.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/522ef605-2631-4e88-9fd8-911b86e0042c/4529237137.pdf
    • https://s3.amazonaws.com/donarepemi/mini_microwave_oven_amazon.pdf
    • https://s3.amazonaws.com/widiku/ragageriveranewifivu.pdf
    • https://uploads.strikinglycdn.com/files/3916ce41-75b0-4022-b84c-2d249c79c16c/dabon.pdf
    • https://uploads.strikinglycdn.com/files/4e009c7e-c685-44f1-9eaa-9ff1cfa8ff99/41079840284.pdf
    • https://s3.amazonaws.com/sazariwapa/38274520311.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_off0000b6c1.bin
cada0c2511e067bea28622cee05e2f469b73dedf7ad199b3cb17230aa794b6a8
pdf-font-stream PDF embedded font (sfnt) at offset 0xB6C1 5348 bytes
font_01_sfnt_off0000c8e6.bin
9a8b1e3d525d06bc2bb2e3ceed094c5f7b803b859097eaf2d6b88f9407a6f432
pdf-font-stream PDF embedded font (sfnt) at offset 0xC8E6 9856 bytes