Malicious PDF — malware analysis report

Static analysis result for SHA-256 1aa760ba44b737c7…

MALICIOUS

PDF

42.5 KB Created: 2021-05-12 20:34:39 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 651f5725d028973e4b5f84ed1ec2c5fd SHA-1: 90fa8d1105a82d94eb97ec98d264042be367749c SHA-256: 1aa760ba44b737c72935bd1f77b678a34560c55abd90b2c1f2e3029eb4e0a253
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple embedded links that point to known malicious redirectors, specifically advertising game hacks and free currency for popular games. The document body and extracted URLs strongly suggest a phishing or scam attempt designed to redirect users to potentially harmful websites. While no scripts were explicitly extracted, the nature of the links and the heuristic firings indicate a malicious intent to lure users into clicking through to malicious infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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 https://netcdn.xyz/app/431946152/robux-boost-game-hack In PDF document text
    • http://ctr74.net/images/roblox-got-talent-piano-hack_GM431946152.pdfIn PDF document text
    • http://ctr74.net/images/roblox-free-robux-hack_GM431946152.pdfIn PDF document text
    • http://ctr74.net/images/free-spin-coin-master-link-2021_GM406889139.pdfIn PDF document text
    • http://ctr74.net/images/robux-hack-no-human-verification_GM431946152.pdfIn PDF document text
    • http://ctr74.net/images/all-minecraft-handbooks_GM479516143.pdfIn PDF document text
    • http://ctr74.net/images/roblox-girl_GM431946152.pdfIn PDF document text
    • http://ctr74.net/images/minecraft-education-edition-free_GM479516143.pdfIn PDF document text
    • http://ctr74.net/images/how-do-you-get-free-robux-without-doing-anything_GM431946152.pdfIn PDF document text
    • http://ctr74.net/images/how-to-download-minecraft-for-free-on-windows_GM479516143.pdfIn PDF document text
    • http://ctr74.net/images/robux-hack-generator_GM431946152.pdfIn PDF document text
    • http://ctr74.net/images/coin-master-free-stars_GM406889139.pdfIn PDF document text
    • http://ctr74.net/images/roblox-free-items-2021_GM431946152.pdfIn PDF document text
    • http://ctr74.net/images/coin-master-hack-ios_GM406889139.pdfIn PDF document text
    • http://ctr74.net/images/roblox-hack-generator_GM431946152.pdfIn PDF document text
    • http://ctr74.net/images/coin-master-free-spins-2021_GM406889139.pdfIn PDF document text
    • http://ctr74.net/images/roblox-earn-robux_GM431946152.pdfIn PDF document text
    • http://ctr74.net/images/coin-master-free-spins-link-2021-april_GM406889139.pdfIn PDF document text
    • http://ctr74.net/images/is-minecraft-free-on-computer_GM479516143.pdfIn PDF document text
    • http://ctr74.net/images/how-to-get-free-spins-on-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://ctr74.net/images/how-to-hack-roblox-jailbreak_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off000048fc.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x48FC 25980 bytes
SHA-256: b21f1443e3971cccea1419df09db7d361223466f1c94bf9da5b48747802f7484
font_01_sfnt_off00008485.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8485 17952 bytes
SHA-256: 11074efe5b2c6d92dadef1a68c4708857388b690ee0ee43b1902778d8611b6e8

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