Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b5529558219a02e…

MALICIOUS

PDF

35.0 KB Created: 2021-06-28 16:30:17 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-15
MD5: a5e8ce14364e6ac94c09aed41ba40acb SHA-1: a19063c659d863a3689284c83c0562a641ff3474 SHA-256: 9b5529558219a02e80ea33559f9485975a05c2c1d3235633480bf4a58382b282
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document contains multiple links to known malicious redirectors, specifically advertising free game hacks and generators for popular games like Roblox and CS:GO. The primary lure is the URL http://netcdn.co/app/431946152/how-get-free-skin-in-csgo-roblox-game-hack, which is identified as a malicious redirector. The document body and embedded URLs suggest a social engineering tactic to trick users into visiting potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 4

  • PDF links to a 'free generator / game hack' redirector critical PDF_GAME_HACK_REDIRECT_LURE
    PDF's clickable action targets a redirector of the form /app/<id>/<slug>-game-hack — the landing-page shape of a large SEO 'free spins / generator / game hack' lure family that funnels victims through rotating disposable hosts to a malware/scam payload. The multi-link variants also trip ML/link-farm rules; this catches the single-link variants that otherwise score clean. CRITICAL on its own: the /app/<id>/<slug>-game-hack path shape is unambiguous scam infra, and the host rotates so a host-list match can't be relied on.
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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 http://netcdn.co/app/431946152/how-get-free-skin-in-csgo-roblox-game-hack In PDF document text
    • https://purihostel.com/assets/CKImages/files/free-robux-site_GM431946152.pdfIn PDF document text
    • https://purihostel.com/assets/CKImages/files/coin-master-free-link_GM406889139.pdfIn PDF document text
    • https://purihostel.com/assets/CKImages/files/how-to-get-roblox-premium-for-free-2021_GM431946152.pdfIn PDF document text
    • https://purihostel.com/assets/CKImages/files/how-to-get-free-clothes-on-roblox-games_GM431946152.pdfIn PDF document text
    • https://purihostel.com/assets/CKImages/files/roblox-cheat-tower-deffense_GM431946152.pdfIn PDF document text
    • https://purihostel.com/assets/CKImages/files/roblox-cheat-robux-apk_GM431946152.pdfIn PDF document text
    • https://purihostel.com/assets/CKImages/files/how-to-gain-more-spins-on-coin-master-for-free_GM406889139.pdfIn PDF document text
    • https://purihostel.com/assets/CKImages/files/free-robux-only-username-no-human-verification_GM431946152.pdfIn PDF document text
    • https://purihostel.com/assets/CKImages/files/coin-master-free-coins-hack_GM406889139.pdfIn PDF document text
    • https://purihostel.com/assets/CKImages/files/free-robux-no-human-verification-or-survey-or-download-2021_GM431946152.pdfIn PDF document text
    • https://purihostel.com/assets/CKImages/files/coin-master-15-free-spin-link-of-last-5-days_GM406889139.pdfIn PDF document text
    • https://purihostel.com/assets/CKImages/files/free-robux-no-human-verification-and-no-survey_GM431946152.pdfIn PDF document text
    • https://purihostel.com/assets/CKImages/files/free-unlimited-robux_GM431946152.pdfIn PDF document text
    • https://purihostel.com/assets/CKImages/files/free-robux-sites-2021_GM431946152.pdfIn PDF document text
    • https://purihostel.com/assets/CKImages/files/free-roblox-well_GM431946152.pdfIn PDF document text
    • https://purihostel.com/assets/CKImages/files/haktuts-coin-master-free-spin-today_GM406889139.pdfIn PDF document text
    • https://purihostel.com/assets/CKImages/files/roblox-apocalypse-rising-hack_GM431946152.pdfIn PDF document text
    • https://purihostel.com/assets/CKImages/files/roblox-free-hats_GM431946152.pdfIn PDF document text
    • https://purihostel.com/assets/CKImages/files/minecraft-free-exe_GM479516143.pdfIn PDF document text
    • https://purihostel.com/assets/CKImages/files/how-to-get-free-robux-not-a-scam_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Related samples 4

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000302f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x302F 22808 bytes
SHA-256: e384bc8bcc52c7d2c556fd9b9fa2f6e736ff8aed52d904e23c2cd655e7231d90
font_01_sfnt_off00006367.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6367 19208 bytes
SHA-256: 76a616bf586c48b2f23f61be5120047f01fd7f6ce8ae5393526f203ff376709e

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