Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3898269e626ec21…

MALICIOUS

PDF

48.1 KB Created: 2021-06-11 00:58:58 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 7abd9a08e34d47efbe7f38f719eec548 SHA-1: ca48f15d27944bdfc26cce0f8be58fc61a524a56 SHA-256: b3898269e626ec21490036e98d404699ecc005bb5e9747469bea11c21ce5eceb
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous links to external websites, many of which are disguised as 'game hacks' or 'free currency generators' for popular games like Roblox and Coin Master. This pattern suggests a lure to drive traffic to potentially malicious sites, possibly for phishing or to host further malware. The presence of a 'download button' lure and callback phishing indicators further support a malicious intent, though no scripts were directly extracted to confirm specific execution chains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9796

Heuristics 6

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • PDF links to a 'free generator / game hack' redirector high 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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-rebux-hack-game-hack PDF link annotation
    • http://www.drent.se/images/how-to-hack-roblox-accounts-on-phone-2021_GM431946152.pdfIn PDF document text
    • http://www.drent.se/images/how-to-hack-roblox-to-grt-robux-the-easy-way_GM431946152.pdfIn PDF document text
    • http://www.drent.se/images/how-to-get-tiktok-famous-free_GM835599320.pdfIn PDF document text
    • http://www.drent.se/images/coin-master-spin-link-free-download_GM406889139.pdfIn PDF document text
    • http://www.drent.se/images/coin-master-hack-download_GM406889139.pdfIn PDF document text
    • http://www.drent.se/images/roblox-welcome-to-bloxburg-money-cheat-july-2021_GM431946152.pdfIn PDF document text
    • http://www.drent.se/images/roblox-work-at-a-pizza-place-money-cheat-2021_GM431946152.pdfIn PDF document text
    • http://www.drent.se/images/robux-only_GM431946152.pdfIn PDF document text
    • http://www.drent.se/images/free-robux-no-pass-requiredfor-pc_GM431946152.pdfIn PDF document text
    • http://www.drent.se/images/hack-coin-master-net_GM406889139.pdfIn PDF document text
    • http://www.drent.se/images/claim-gg-free-robux_GM431946152.pdfIn PDF document text
    • http://www.drent.se/images/tiktok-for-free_GM835599320.pdfIn PDF document text
    • http://www.drent.se/images/free-roblox-accounts-with-robux_GM431946152.pdfIn PDF document text
    • http://www.drent.se/images/free-robux-no-human-verification-or-survey-2021_GM431946152.pdfIn PDF document text
    • http://www.drent.se/images/how-to-get-free-spins-and-coins-in-coin-master_GM406889139.pdfIn PDF document text
    • http://www.drent.se/images/wild-and-free-serena-ryder-id-code-roblox_GM431946152.pdfIn PDF document text
    • http://www.drent.se/images/free-thumbnails-roblox-game_GM431946152.pdfIn PDF document text
    • http://www.drent.se/images/how-to-get-free-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://www.drent.se/images/free-minecraft-skins-xbox-one_GM479516143.pdfIn PDF document text
    • http://www.drent.se/images/minecraft-bedrock-edition-download-pc-free_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_off00005060.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5060 25424 bytes
SHA-256: ef4023c9bcb1054f4bcd669e1cc32ed7a0dbc97396f81147c77ec42ef02b7c97
font_01_sfnt_off00008be3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8BE3 3700 bytes
SHA-256: cf7c4eff941a01762d61d3c0982d8451eaa95d4b3be915dfa3d976fbe05a03f5
font_02_sfnt_off000098f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x98F2 18320 bytes
SHA-256: 4a77903e73ca2c165e75e28c0dda06466b00a5c612c8cdc6668a9bd03fe657ad

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