Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c1e850dfb4bee45…

MALICIOUS

PDF

66.3 KB Created: 2020-11-18 19:50:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 805da703aae7a9672aab224b59fd7682 SHA-1: ada56fc1babec989ddcbaa03972a7f3563c4ad89 SHA-256: 1c1e850dfb4bee4507fc4c28a0d2679fe0c4e7a1e1faea2262d0f41b2b5825d8
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains embedded text referencing a "Brawl stars apk hack" and a critical heuristic firing for a malicious redirector link. The link `https://gettraff.ru/aws?utm_term=brawl+stars+apk+hack+18.+104` is identified as malicious and likely leads to a phishing or malware download site. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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/aws?utm_term=brawl+stars+apk+hack+18.+104 In PDF document text
    • https://cdn-cms.f-static.net/uploads/4366316/normal_5fa0202fe5159.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369638/normal_5fae3299b35c5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366630/normal_5f874adb53f20.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377388/normal_5f903be4687ea.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470972/normal_5faff6062d199.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374847/normal_5fa3a85cb7ea1.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/fuwawibu/vitenu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/23b84060-9f87-4cb9-a1e1-2d576882a7a4/infinity_tss-450_5.1.pdfIn PDF document text
    • https://s3.amazonaws.com/zetubakuz/65387612933.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6f505f88-c2c5-4b46-9d8f-de76173f403b/husqvarna_chainsaw_350_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cc8526eb-0fe3-43f2-a621-e3592db61ddd/jagofevegizukojobugomuwo.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c4c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC4C1 5736 bytes
SHA-256: 45277cbb6bb6fa5cddcbc188bc91a69f3dfaeb1fdf64a77c1475131564ecdcdb
font_01_sfnt_off0000d861.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD861 10896 bytes
SHA-256: e952d17b8980e4d1c057db508a21a827b6119fc6bd3d42396579fad215346588