Malicious PDF — malware analysis report

Static analysis result for SHA-256 3cb1b7d20e08b66a…

MALICIOUS

PDF

52.7 KB Created: 2021-06-09 12:49:16 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 90688b46c2504d7c0fb3f581bebf6c0e SHA-1: a209c3949f1a2b13ca61d8809d97aeff48cb27fb SHA-256: 3cb1b7d20e08b66a508c13c265df57eb77086cd2e55e58e029b3cd2a17571140
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a lure for free in-game currency for Roblox, which is a common tactic for phishing and malware distribution. It embeds a link to a known malicious redirector infrastructure, https://netcdn.tw/app/431946152/roblox-bubble-gum-simulator-free-robux-game-hack, designed to lead users to potentially harmful content. The ML classifier also flagged this PDF as malicious with high confidence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9844

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.tw/app/431946152/roblox-bubble-gum-simulator-free-robux-game-hack In PDF document text
    • https://library.fdk.ac.id/repository/roblox-detects-cheat-engine_GM431946152.pdfIn PDF document text
    • https://library.fdk.ac.id/repository/roblox-booga-booga-hack_GM431946152.pdfIn PDF document text
    • https://library.fdk.ac.id/repository/free-coins-for-coin-master-blogger_GM406889139.pdfIn PDF document text
    • https://library.fdk.ac.id/repository/roblox-the-quarry-cheats_GM431946152.pdfIn PDF document text
    • https://library.fdk.ac.id/repository/coin-master-free-spin-and-coins-links_GM406889139.pdfIn PDF document text
    • https://library.fdk.ac.id/repository/free-robux-roblox-promo-codes_GM431946152.pdfIn PDF document text
    • https://library.fdk.ac.id/repository/how-to-hack-mining-simulator-roblox_GM431946152.pdfIn PDF document text
    • https://library.fdk.ac.id/repository/minecraft-font-free_GM479516143.pdfIn PDF document text
    • https://library.fdk.ac.id/repository/coinmasterhack-club_GM406889139.pdfIn PDF document text
    • https://library.fdk.ac.id/repository/coin-master-free-spins-link-2021-april_GM406889139.pdfIn PDF document text
    • https://library.fdk.ac.id/repository/roblox-aimbot-dll-hack_GM431946152.pdfIn PDF document text
    • https://library.fdk.ac.id/repository/haktuts-coin-master-free-spin-link-today_GM406889139.pdfIn PDF document text
    • https://library.fdk.ac.id/repository/free-roblox-dominus_GM431946152.pdfIn PDF document text
    • https://library.fdk.ac.id/repository/hack-coin-master-ios_GM406889139.pdfIn PDF document text
    • https://library.fdk.ac.id/repository/coin-master-free-coins-link-2021_GM406889139.pdfIn PDF document text
    • https://library.fdk.ac.id/repository/free-attacks-on-coin-master_GM406889139.pdfIn PDF document text
    • https://library.fdk.ac.id/repository/robux-free-co_GM431946152.pdfIn PDF document text
    • https://library.fdk.ac.id/repository/hack-coin-master-game-download_GM406889139.pdfIn PDF document text
    • https://library.fdk.ac.id/repository/how-to-hack-a-roblox-account-easy_GM431946152.pdfIn PDF document text
    • https://library.fdk.ac.id/repository/free-stuff-in-roblox-catalog_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Related samples 5

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
stream_004_off000054d7.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x54D7 39092 bytes
SHA-256: 3b2d5657473690abc5d7cfa5cfd281cfe99ba6c337318f053a3867ba3aa96c82
font_01_sfnt_off0000aabb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAABB 18800 bytes
SHA-256: 3b6fa43d17a725eb0a922a3958c9c16be645462c329f7a91a1a32b733d84f802

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