Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1a124c45be901ed…

MALICIOUS

PDF

35.0 KB Created: 2021-07-04 03:19:09 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-13
MD5: aef5843927664430ab77b8c2e75cdfe3 SHA-1: 6af4183ae7452c065ba7a1467db4636aec27fbfa SHA-256: c1a124c45be901ed079c300bb0e3b3dd88d6d57d92b805ff66fc1426ee9e4ccd
160 Risk Score

Malware Insights

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

The PDF contains multiple links to known malicious redirector infrastructure, specifically advertising game hacks and generators. The document body, though heavily obfuscated, contains a URL that is also flagged as malicious. The presence of these links and the ML classifier's high confidence score indicate a malicious lure designed to redirect users to potentially harmful sites.

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.tw/app/479516143/minecraft-free-install-game-hack In PDF document text
    • http://razredna-nastava.net/files/roblox-how-to-get-free-robux-in-pc_GM431946152.pdfIn PDF document text
    • https://razredna-nastava.net/files/can-i-get-robux-for-free_GM431946152.pdfIn PDF document text
    • https://razredna-nastava.net/files/minecraft-hacked-client_GM479516143.pdfIn PDF document text
    • https://razredna-nastava.net/files/free-robux-on-youtube_GM431946152.pdfIn PDF document text
    • http://razredna-nastava.net/files/robux-hacks-that-work-2021_GM431946152.pdfIn PDF document text
    • https://razredna-nastava.net/files/how-to-hack-roblox-accounts_GM431946152.pdfIn PDF document text
    • http://razredna-nastava.net/files/hack-configuration-roblox-robuxian_GM431946152.pdfIn PDF document text
    • https://razredna-nastava.net/files/how-to-get-minecraft-bedrock-for-free-with-java_GM479516143.pdfIn PDF document text
    • http://razredna-nastava.net/files/minecraft-pc-free_GM479516143.pdfIn PDF document text
    • http://razredna-nastava.net/files/no-verification-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://razredna-nastava.net/files/roblox-free-item-codes_GM431946152.pdfIn PDF document text
    • https://razredna-nastava.net/files/get-more-robux_GM431946152.pdfIn PDF document text
    • https://razredna-nastava.net/files/how-to-hack-someones-profile-on-roblox_GM431946152.pdfIn PDF document text
    • https://razredna-nastava.net/files/roblox-spin-hack_GM431946152.pdfIn PDF document text
    • https://razredna-nastava.net/files/coin-master-codes_GM406889139.pdfIn PDF document text
    • http://razredna-nastava.net/files/websites-that-give-you-free-robux_GM431946152.pdfIn PDF document text
    • https://razredna-nastava.net/files/free-modded-minecraft-server_GM479516143.pdfIn PDF document text
    • http://razredna-nastava.net/files/how-to-get-animation-packs-for-free-on-roblox_GM431946152.pdfIn PDF document text
    • https://razredna-nastava.net/files/pubg-uc-redeem-code-2021_GM1330123889.pdfIn PDF document text
    • http://razredna-nastava.net/files/how-to-cheat-in-roblox-basewars_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_off00003492.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3492 22996 bytes
SHA-256: 125e5b5287cd68d3fdf348718f0e459646396d4eb67b9e9e333e0ec7c822a1c4
font_01_sfnt_off0000676f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x676F 17928 bytes
SHA-256: ecac4b827e849319c0c5044e9321c91e8ddddd01a8be4fd48df7e18ba0227d57

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