Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b9cde1f3182df2c…

MALICIOUS

PDF

34.1 KB Created: 2021-06-29 07:04:58 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 7dae5ff1e4cc529eee3a5cdbff0d5354 SHA-1: b6f5ecbdb6c9c4aecea81b09e6065623b8d269f8 SHA-256: 4b9cde1f3182df2c04c2e905b82b5c40c8b6afdea6a3f59b8f04a7aee7487af4
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links to external websites, including a known malicious redirector at http://netcdn.co/app/431946152/what-to-do-if-my-roblox-account-gets-hacked-game-hack. The document body and embedded URLs suggest a lure related to game hacks and in-game currency, a common social engineering tactic. The presence of these links and the ML classifier's high confidence score indicate a malicious intent to redirect users to potentially harmful content or download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9824

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/what-to-do-if-my-roblox-account-gets-hacked-game-hack In PDF document text
    • https://www.sarsen.net/uploads/files/files/roblox-hack-to-get-on-accont_GM431946152.pdfIn PDF document text
    • https://www.sarsen.net/uploads/files/files/free-coin-master-spin-and-coin-link_GM406889139.pdfIn PDF document text
    • https://www.sarsen.net/uploads/files/files/how-to-get-free-cards-on-coin-master_GM406889139.pdfIn PDF document text
    • https://www.sarsen.net/uploads/files/files/coin-master-hack-2021_GM406889139.pdfIn PDF document text
    • https://www.sarsen.net/uploads/files/files/heroes-online-roblox_GM431946152.pdfIn PDF document text
    • https://www.sarsen.net/uploads/files/files/roblox-got-talent-piano-hack_GM431946152.pdfIn PDF document text
    • https://www.sarsen.net/uploads/files/files/google-moon-active_GM406889139.pdfIn PDF document text
    • https://www.sarsen.net/uploads/files/files/free-tiktok-followers-trial_GM835599320.pdfIn PDF document text
    • https://www.sarsen.net/uploads/files/files/free-spins-on-coin-master-cheat_GM406889139.pdfIn PDF document text
    • https://www.sarsen.net/uploads/files/files/how-to-get-free-robux-on-phone_GM431946152.pdfIn PDF document text
    • https://www.sarsen.net/uploads/files/files/free-spins-coin-master-2021_GM406889139.pdfIn PDF document text
    • https://www.sarsen.net/uploads/files/files/how-to-hack-and-get-free-robux_GM431946152.pdfIn PDF document text
    • https://www.sarsen.net/uploads/files/files/minecraft-java-hacks_GM479516143.pdfIn PDF document text
    • https://www.sarsen.net/uploads/files/files/free-apk-mod-coin-master_GM406889139.pdfIn PDF document text
    • https://www.sarsen.net/uploads/files/files/coin-master-free-spins-link-2021-today_GM406889139.pdfIn PDF document text
    • https://www.sarsen.net/uploads/files/files/100-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • https://www.sarsen.net/uploads/files/files/how-to-get-free-robux-no-scam_GM431946152.pdfIn PDF document text
    • https://www.sarsen.net/uploads/files/files/how-to-get-minecraft-for-free-ios_GM479516143.pdfIn PDF document text
    • https://www.sarsen.net/uploads/files/files/free-tiktok-likes-without-verification_GM835599320.pdfIn PDF document text
    • https://www.sarsen.net/uploads/files/files/roblox-texting-simulator-hack-script_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Related samples 8

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_off00002b94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2B94 22572 bytes
SHA-256: a1857540fa14112c0baa2594af4a49de567195a8f5829a75adaa689d3481e806
font_01_sfnt_off00005de1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5DE1 19984 bytes
SHA-256: 957ad03af195eeb9c44f7f3864253874c63a246b2e8127ebf3119552a83b45b5

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