Malicious PDF — malware analysis report

Static analysis result for SHA-256 187d405465aca002…

MALICIOUS

PDF

46.5 KB Created: 2021-06-11 03:22:50 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-08-25
MD5: f2c95bb572fcc1f038225916115de731 SHA-1: d219c6e979b913cdbfdc0a37dbecc78912a79a02 SHA-256: 187d405465aca002f67431940c3565ac7166da8976f0fb14d8238492d9bcdb37
200 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF document contains a critical heuristic firing for a malicious redirector link, specifically disguised as a 'free generator / game hack' for Roblox. It also displays a fake CAPTCHA or human verification prompt to trick the user into clicking the malicious link. The embedded URL leads to known malicious redirector infrastructure, suggesting an attempt to deliver a second-stage payload or phish for credentials.

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.tw/app/431946152/win-free-items-in-roblox-game-hack In PDF document text
    • https://www.ocic.hr/files/coin-master-hack-app-download-free_GM406889139.pdfIn PDF document text
    • http://www.ocic.hr/files/how-to-hack-someones-roblox-account_GM431946152.pdfIn PDF document text
    • http://www.ocic.hr/files/coin-master-hack-xyz-download_GM406889139.pdfIn PDF document text
    • https://www.ocic.hr/files/sites-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://www.ocic.hr/files/how-to-get-free-robux-codes_GM431946152.pdfIn PDF document text
    • http://www.ocic.hr/files/free-robux-easy-and-fast_GM431946152.pdfIn PDF document text
    • http://www.ocic.hr/files/how-to-hack-a-roblox-account-2021_GM431946152.pdfIn PDF document text
    • http://www.ocic.hr/files/free-tix-roblox-pbb_GM431946152.pdfIn PDF document text
    • https://www.ocic.hr/files/minecraft-bedrock-free_GM479516143.pdfIn PDF document text
    • http://www.ocic.hr/files/coin-master-hack-tool-v1-9-download-free_GM406889139.pdfIn PDF document text
    • http://www.ocic.hr/files/roblox-printables-free_GM431946152.pdfIn PDF document text
    • https://www.ocic.hr/files/how-to-get-free-robux-seniac_GM431946152.pdfIn PDF document text
    • http://www.ocic.hr/files/free-spins-coin-master-2021-glitch_GM406889139.pdfIn PDF document text
    • https://www.ocic.hr/files/coin-master-free-spins-link-cheat_GM406889139.pdfIn PDF document text
    • https://www.ocic.hr/files/roblox-ro-ghoul-hack_GM431946152.pdfIn PDF document text
    • http://www.ocic.hr/files/tiktok-free-view-links_GM835599320.pdfIn PDF document text
    • https://www.ocic.hr/files/how-to-get-free-robux-no-human-verification_GM431946152.pdfIn PDF document text
    • http://www.ocic.hr/files/minecraft-free-online_GM479516143.pdfIn PDF document text
    • https://www.ocic.hr/files/free-robux-without-human-verification-or-survey-or-offers-2021_GM431946152.pdfIn PDF document text
    • https://www.ocic.hr/files/free-robux-accounts_GM431946152.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_off00005180.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5180 28088 bytes
SHA-256: 03a9d3d34aa13b8a9c602dfd0bf5ad4beaef4f10d555ebc3ea6150bf473176c6
font_01_sfnt_off00009242.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9242 18628 bytes
SHA-256: 7e6af82951aacf6af7ee59657f7166e6453469275b053ce93a7079b956048b8f

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