Malicious PDF — malware analysis report

Static analysis result for SHA-256 5be57872d69f69d6…

MALICIOUS

PDF

46.8 KB Created: 2021-06-03 04:06:48 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-23
MD5: df7a55fdbba70899dcead59726c23196 SHA-1: 405c62231dd473923223e66d14cd9c0c269a5833 SHA-256: 5be57872d69f69d685c404afe6198c66033eebd6742f3f52a92cee446b06f746
200 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a game hack redirect lure, pointing to a URL that is also flagged as malicious infrastructure. The document body, though partially garbled, includes text related to 'free Robux' and a URL that aligns with the lure. The presence of a fake CAPTCHA heuristic suggests an attempt to trick the user into interacting with the malicious link, likely leading to further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9832

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.online/app/431946152/how-to-hack-and-get-free-robux-game-hack In PDF document text
    • https://www.legclub.org/uploads/files/files/master-coin-hack-game_GM406889139.pdfIn PDF document text
    • https://www.legclub.org/uploads/files/files/free-minecraft-printables-food-labels_GM479516143.pdfIn PDF document text
    • https://www.legclub.org/uploads/files/files/roblox-hack-me-robux_GM431946152.pdfIn PDF document text
    • https://www.legclub.org/uploads/files/files/minecraft-free-ios-2021_GM479516143.pdfIn PDF document text
    • https://www.legclub.org/uploads/files/files/free-robux-no-human-verification-or-survey-or-download-2021_GM431946152.pdfIn PDF document text
    • https://www.legclub.org/uploads/files/files/coin-master-cheat-apk-free-download_GM406889139.pdfIn PDF document text
    • https://www.legclub.org/uploads/files/files/no-human-verification_GM431946152.pdfIn PDF document text
    • https://www.legclub.org/uploads/files/files/codes-how-to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://www.legclub.org/uploads/files/files/how-to-get-minecraft-bedrock-for-free_GM479516143.pdfIn PDF document text
    • https://www.legclub.org/uploads/files/files/tiktok-free-view-iphone-7-plus_GM835599320.pdfIn PDF document text
    • https://www.legclub.org/uploads/files/files/minecraft-iphone-free_GM479516143.pdfIn PDF document text
    • https://www.legclub.org/uploads/files/files/how-to-make-a-minecraft-pe-server-for-free_GM479516143.pdfIn PDF document text
    • https://www.legclub.org/uploads/files/files/free-roblox-outfits-2021_GM431946152.pdfIn PDF document text
    • https://www.legclub.org/uploads/files/files/free-minecraft-account-and-password_GM479516143.pdfIn PDF document text
    • https://www.legclub.org/uploads/files/files/i-didnt-get-my-free-spins-in-coin-master_GM406889139.pdfIn PDF document text
    • https://www.legclub.org/uploads/files/files/roblox-army-free-robux_GM431946152.pdfIn PDF document text
    • https://www.legclub.org/uploads/files/files/mcpe-master-unlimited-coins-free-download_GM406889139.pdfIn PDF document text
    • https://www.legclub.org/uploads/files/files/coin-master-unlimited-spins_GM406889139.pdfIn PDF document text
    • https://www.legclub.org/uploads/files/files/free-coins-and-spins-link-for-coin-master_GM406889139.pdfIn PDF document text
    • https://www.legclub.org/uploads/files/files/coin-master-hack-android-root_GM406889139.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_004_off00005419.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5419 27004 bytes
SHA-256: 3677892f35bc1bcab182e06f74f23d8d008355434ab68a200fe8bee0df846a13
font_01_sfnt_off000092b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x92B9 18856 bytes
SHA-256: d1af75e50eba08e00cb44d21026f4cdbf29920fa5250f1112d9d0eb56b6eb802

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