Malicious PDF — malware analysis report

Static analysis result for SHA-256 c324dbb6d08a7467…

MALICIOUS

PDF

49.6 KB Created: 2021-06-03 06:08:53 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 21502183fc4e6700ed307efc1c6053fa SHA-1: 785508d710362ce43bd6736483acb8da5882376d SHA-256: c324dbb6d08a746733d898eb1c709013471514a3eb36aca60e1a6718eb48069f
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links to known malicious redirectors and sites offering game hacks, such as 'free-robux-hack-2021-game-hack'. The document body, though partially corrupted, also contains similar lures and embedded URLs. This suggests the primary goal is to redirect users to potentially malicious websites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9796

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.online/app/431946152/free-robux-hack-2021-game-hack In PDF document text
    • http://www.3d-gold.com.hk/upload/files/free-gold-cards-coin-master_GM406889139.pdfIn PDF document text
    • http://www.3d-gold.com.hk/upload/files/coin-master-free-spin-and-coin-links_GM406889139.pdfIn PDF document text
    • http://www.3d-gold.com.hk/upload/files/robux-place-rewards_GM431946152.pdfIn PDF document text
    • http://www.3d-gold.com.hk/upload/files/roblox-place-rewards_GM431946152.pdfIn PDF document text
    • http://www.3d-gold.com.hk/upload/files/free-roblox-generator_GM431946152.pdfIn PDF document text
    • http://www.3d-gold.com.hk/upload/files/roblox-promo-code-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://www.3d-gold.com.hk/upload/files/minecraft-online-free-download_GM479516143.pdfIn PDF document text
    • http://www.3d-gold.com.hk/upload/files/coin-master-free-spins-coins_GM406889139.pdfIn PDF document text
    • http://www.3d-gold.com.hk/upload/files/free-coin-master-glitches_GM406889139.pdfIn PDF document text
    • http://www.3d-gold.com.hk/upload/files/free-coin-master-credit_GM406889139.pdfIn PDF document text
    • http://www.3d-gold.com.hk/upload/files/minecraft-server-free-trial_GM479516143.pdfIn PDF document text
    • http://www.3d-gold.com.hk/upload/files/hackear-coin-master-android_GM406889139.pdfIn PDF document text
    • http://www.3d-gold.com.hk/upload/files/roblox-its-free_GM431946152.pdfIn PDF document text
    • http://www.3d-gold.com.hk/upload/files/minecraft-bedrock-edition-free_GM479516143.pdfIn PDF document text
    • http://www.3d-gold.com.hk/upload/files/free-robux-only-1-step_GM431946152.pdfIn PDF document text
    • http://www.3d-gold.com.hk/upload/files/watch-videos-for-robux_GM431946152.pdfIn PDF document text
    • http://www.3d-gold.com.hk/upload/files/free-coin-master-spins-blogger_GM406889139.pdfIn PDF document text
    • http://www.3d-gold.com.hk/upload/files/free-robux-generator-no-survey-no-download-no-human-verification_GM431946152.pdfIn PDF document text
    • http://www.3d-gold.com.hk/upload/files/coin-master-free-coins-and-spins-blogspot_GM406889139.pdfIn PDF document text
    • http://www.3d-gold.com.hk/upload/files/can-you-get-minecraft-for-free-on-pc_GM479516143.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off000050cf.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x50CF 27196 bytes
SHA-256: 4dd2c91aa2793c94d261b0e9a86934f0680567d7dd85f5904d91d924613e9cb3
font_01_sfnt_off00008f3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8F3C 6100 bytes
SHA-256: f866077ce59d6ea276f75e4af76daa2aab5f3a1a679df144776123d85664d65c
font_02_sfnt_off00009dc7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9DC7 18816 bytes
SHA-256: b2e74e066e927f416452387fe7118a02e4882588ce64a473b0bf6318b488dee0

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