Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b012d50ddbbaf1e…

MALICIOUS

PDF

34.2 KB Created: 2021-06-29 15:40:54 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 15409c705ca2af91a749ad9f7d973142 SHA-1: 935077fdc21e4d85597a8890e1fef635c05f014b SHA-256: 0b012d50ddbbaf1e6349466dd748e29ba943a37d82701c42b3d64fb3469a63f6
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous links to external sites, including a primary redirector at http://netcdn.co/app/431946152/free-robux-no-human-verification-2021-or-survey-generator-game-hack, which is flagged as malicious. The document body and heuristics indicate a lure for free game currency (Robux, Coin Master spins) and game hacks, designed to lead users to potentially harmful content or further malicious downloads. The presence of embedded URLs and the nature of the lures strongly suggest a phishing or scamming attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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.
  • 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.
  • 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/free-robux-no-human-verification-2021-or-survey-generator-game-hack In PDF document text
    • http://lib.kunci.or.id/repository/free-robux-glitch-roblox-game_GM431946152.pdfIn PDF document text
    • http://lib.kunci.or.id/repository/how-to-hack-roblox-for-robux_GM431946152.pdfIn PDF document text
    • http://lib.kunci.or.id/repository/how-to-get-free-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://lib.kunci.or.id/repository/pokemon-go-free-gps-hack_GM1094591345.pdfIn PDF document text
    • http://lib.kunci.or.id/repository/coin-master-free-spins-link-download-apk_GM406889139.pdfIn PDF document text
    • http://lib.kunci.or.id/repository/roblox-20-download-free_GM431946152.pdfIn PDF document text
    • http://lib.kunci.or.id/repository/coin-master-rewards-free-spins_GM406889139.pdfIn PDF document text
    • http://lib.kunci.or.id/repository/roblox-e-free_GM431946152.pdfIn PDF document text
    • http://lib.kunci.or.id/repository/games-in-roblox-that-give-you-robux_GM431946152.pdfIn PDF document text
    • http://lib.kunci.or.id/repository/como-hackear-a-la-gente-en-roblox_GM431946152.pdfIn PDF document text
    • http://lib.kunci.or.id/repository/free-draw-roblox_GM431946152.pdfIn PDF document text
    • http://lib.kunci.or.id/repository/free-roblox-codes-that-work_GM431946152.pdfIn PDF document text
    • http://lib.kunci.or.id/repository/free-roblox-money_GM431946152.pdfIn PDF document text
    • http://lib.kunci.or.id/repository/coin-master-hack-2021-app_GM406889139.pdfIn PDF document text
    • http://lib.kunci.or.id/repository/free-robux-generator-no-human-verification-or-survey-2021_GM431946152.pdfIn PDF document text
    • http://lib.kunci.or.id/repository/free-robux-no-human-verification-or-survey_GM431946152.pdfIn PDF document text
    • http://lib.kunci.or.id/repository/free-spin-coin-master-iphone_GM406889139.pdfIn PDF document text
    • http://lib.kunci.or.id/repository/free-spin-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://lib.kunci.or.id/repository/roblox-promo-codes-free-2021_GM431946152.pdfIn PDF document text
    • http://lib.kunci.or.id/repository/how-to-play-minecraft-for-free_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
font_00_sfnt_off00002d99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2D99 21884 bytes
SHA-256: c62f4150731243bab5845c58d1d37323e2ae2d2e9037c6ae461342d4a30a4cdc
font_01_sfnt_off00005dc2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5DC2 20028 bytes
SHA-256: 7716bc6e386332f505eb14df548f6c63d3baf4cabdb17dfa8d65832a240467a4

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