Malicious PDF — malware analysis report

Static analysis result for SHA-256 b87e61dc56b862ff…

MALICIOUS

PDF

35.3 KB Created: 2021-06-26 09:59:06 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-23
MD5: a891dac4312ebc692b9c7ec71b70d231 SHA-1: 342d20ecaa14a9a4d055a0420ad9540adf279afb SHA-256: b87e61dc56b862ff2efa2849b8ba6dd69d877302cdda0b41f9051a377d4b7ff6
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document contains multiple links, including one identified as a malicious redirector, that promise game hacks and free items for popular games like Roblox and Coin Master. The document body, though partially corrupted, contains references to these lures and the malicious URL. The presence of these lures and the identified malicious redirector strongly suggests a phishing or scam attempt designed to lead users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 http://netcdn.co/app/431946152/roblox-hack-dll-chat-game-hack In PDF document text
    • http://www.ocic.hr/files/e-free-roblox_GM431946152.pdfIn PDF document text
    • http://www.ocic.hr/files/how-do-u-scam-people-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://www.ocic.hr/files/free-spin-coin-master-game_GM406889139.pdfIn PDF document text
    • http://www.ocic.hr/files/gift-card-codes-free-roblox_GM431946152.pdfIn PDF document text
    • https://www.ocic.hr/files/minecraft-xbox-one-free_GM479516143.pdfIn PDF document text
    • https://www.ocic.hr/files/how-to-change-your-roblox-username-for-free-2021_GM431946152.pdfIn PDF document text
    • https://www.ocic.hr/files/tiktok-free-comments_GM835599320.pdfIn PDF document text
    • https://www.ocic.hr/files/coin-master-free-spins-link-haktuts_GM406889139.pdfIn PDF document text
    • https://www.ocic.hr/files/free-roblox-hack-us_GM431946152.pdfIn PDF document text
    • http://www.ocic.hr/files/how-to-get-free-tiktok-coins_GM835599320.pdfIn PDF document text
    • http://www.ocic.hr/files/minecraft-hacked-client-download_GM479516143.pdfIn PDF document text
    • https://www.ocic.hr/files/robux-websites-2021_GM431946152.pdfIn PDF document text
    • https://www.ocic.hr/files/how-to-make-a-private-server-on-roblox-for-free_GM431946152.pdfIn PDF document text
    • https://www.ocic.hr/files/minecraft-bedrock-download_GM479516143.pdfIn PDF document text
    • https://www.ocic.hr/files/coin-master-hack-program_GM406889139.pdfIn PDF document text
    • http://www.ocic.hr/files/roblox-hack-2021_GM431946152.pdfIn PDF document text
    • https://www.ocic.hr/files/mcpe-master-coins-hack_GM406889139.pdfIn PDF document text
    • https://www.ocic.hr/files/how-to-get-free-robux-on-chromebook_GM431946152.pdfIn PDF document text
    • http://www.ocic.hr/files/daily-free-spins-coin-master-2021_GM406889139.pdfIn PDF document text
    • https://www.ocic.hr/files/minecraft-112-2-hacked-client_GM479516143.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_002_off00003336.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x3336 22360 bytes
SHA-256: 870c3c7c5da8c0beb865fd2700ee555c8cfd63428a971a4ec32dd47ae1d797be
font_01_sfnt_off000064d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x64D4 19092 bytes
SHA-256: 3355620c64c54c79f66b883f734b60f0e8a6b9bc171ff3630d0572baea43b9f4

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