Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b48bfa8c3e40bc2…

MALICIOUS

PDF

44.8 KB Created: 2021-05-15 02:15:12 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-08-25
MD5: b4d35923b7c2030283ca037ee0e149d1 SHA-1: e7734d78fa605bca85e01e8fb6a8d8a257f1d4f4 SHA-256: 0b48bfa8c3e40bc2220a203262f54c97e50a78dd0586d0a1e3c5bd0ba393de08
200 Risk Score

Malware Insights

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

The PDF document contains a critical heuristic firing for a malicious redirector link, disguised as a game hack or generator. It also displays a fake CAPTCHA to trick users into clicking the link, which leads to a known malicious infrastructure. The document body and embedded URLs further support this lure, aiming to exploit user interest in free in-game currency or items.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9632

Heuristics 5

  • 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.
  • Fake CAPTCHA / human verification prompt high SE_FAKE_CAPTCHA
    Document displays a fake CAPTCHA or human-verification prompt — used to trick users into running commands or pressing keyboard shortcuts
  • 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/406889139/coin-master-hack-unlimited-spins-apk-download-game-hack In PDF document text
    • http://jointworkstudio.com/images/how-to-get-robux-for-free-2021_GM431946152.pdfIn PDF document text
    • http://jointworkstudio.com/images/roblox-download_GM431946152.pdfIn PDF document text
    • http://jointworkstudio.com/images/free-online-generator-for-coin-master_GM406889139.pdfIn PDF document text
    • http://jointworkstudio.com/images/free-robux-only-username_GM431946152.pdfIn PDF document text
    • http://jointworkstudio.com/images/master-8-ball-pool-free-coins_GM406889139.pdfIn PDF document text
    • http://jointworkstudio.com/images/free-minecraft-survival-server_GM479516143.pdfIn PDF document text
    • http://jointworkstudio.com/images/minecraft-java-hacks_GM479516143.pdfIn PDF document text
    • http://jointworkstudio.com/images/free-minecraft-windows-10-with-java_GM479516143.pdfIn PDF document text
    • http://jointworkstudio.com/images/minecraft-pocket-edition-free-download_GM479516143.pdfIn PDF document text
    • http://jointworkstudio.com/images/how-to-get-roebucks-on-roblox_GM431946152.pdfIn PDF document text
    • http://jointworkstudio.com/images/free-roblox-characters_GM431946152.pdfIn PDF document text
    • http://jointworkstudio.com/images/do-you-get-minecraft-windows-10-for-free_GM479516143.pdfIn PDF document text
    • http://jointworkstudio.com/images/ultimate-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://jointworkstudio.com/images/coin-master-hack-online-download_GM406889139.pdfIn PDF document text
    • http://jointworkstudio.com/images/how-to-get-free-robux-2021_GM431946152.pdfIn PDF document text
    • http://jointworkstudio.com/images/i-need-more-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://jointworkstudio.com/images/roblox-hack-com_GM431946152.pdfIn PDF document text
    • http://jointworkstudio.com/images/cheat-codes-for-coin-master_GM406889139.pdfIn PDF document text
    • http://jointworkstudio.com/images/how-to-hack-roblox-accounts-2021-easy_GM431946152.pdfIn PDF document text
    • http://jointworkstudio.com/images/coin-master-free-coins-and-spins-today_GM406889139.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_003_off00004966.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4966 24152 bytes
SHA-256: 8b98b8ae0086b097b63446407763daa54f0241de317c16a4bdd39dde05f8b630
font_01_sfnt_off00008084.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8084 2944 bytes
SHA-256: e8dca988325d5b5adea380508eed68725fcb814536e93cd420f224b7166adc23
font_02_sfnt_off00008ab0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8AB0 18916 bytes
SHA-256: 36b5946d0fa01df03061b9872aea65f63cba93bccd0378a8f0b0329212d0019c

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