Malicious PDF — malware analysis report

Static analysis result for SHA-256 2cd49cc2522ffeb0…

MALICIOUS

PDF

35.5 KB Created: 2021-07-05 08:51:14 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 90453a35f783e190c507edb45aebf92c SHA-1: ad058364c1f401556b51c6655c3f443d686951ec SHA-256: 2cd49cc2522ffeb004538add1f833586e7d94891476420421df8bb5bb515d59b
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, including one identified as a malicious redirector leading to a 'game hack' lure. The document body and heuristics indicate a strong attempt to trick users into downloading or accessing potentially harmful content. While no scripts were explicitly extracted, the nature of the links and the ML classification suggest a malicious intent to redirect users to exploit or scam sites.

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.tw/app/406889139/real-hack-for-coin-master-game-hack In PDF document text
    • http://www.stttekstil.ac.id/elib/repository/roblox-apocalypse-rising-cheat-engine_GM431946152.pdfIn PDF document text
    • http://www.stttekstil.ac.id/elib/repository/free-unused-roblox-accountsno-robux_GM431946152.pdfIn PDF document text
    • http://www.stttekstil.ac.id/elib/repository/who-did-i-get-free-robux_GM431946152.pdfIn PDF document text
    • http://www.stttekstil.ac.id/elib/repository/coin-master-free-spins-daily_GM406889139.pdfIn PDF document text
    • http://www.stttekstil.ac.id/elib/repository/oprewards-free-robux_GM431946152.pdfIn PDF document text
    • http://www.stttekstil.ac.id/elib/repository/coin-master-free-spins-link-2021_GM406889139.pdfIn PDF document text
    • http://www.stttekstil.ac.id/elib/repository/free-spins-for-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://www.stttekstil.ac.id/elib/repository/2021-roblox-hack_GM431946152.pdfIn PDF document text
    • http://www.stttekstil.ac.id/elib/repository/minecraft-multiplayer-free_GM479516143.pdfIn PDF document text
    • http://www.stttekstil.ac.id/elib/repository/vip-server-roblox-free_GM431946152.pdfIn PDF document text
    • http://www.stttekstil.ac.id/elib/repository/free-robux-generator-no-human-verification-or-surveys_GM431946152.pdfIn PDF document text
    • http://www.stttekstil.ac.id/elib/repository/blox-land-robux-free_GM431946152.pdfIn PDF document text
    • http://www.stttekstil.ac.id/elib/repository/microsoft-free-robux_GM431946152.pdfIn PDF document text
    • http://www.stttekstil.ac.id/elib/repository/hack-de-robux-gratis_GM431946152.pdfIn PDF document text
    • http://www.stttekstil.ac.id/elib/repository/roblox-gift-card-codes-for-free_GM431946152.pdfIn PDF document text
    • http://www.stttekstil.ac.id/elib/repository/minecraft-diamond-finder-hack_GM479516143.pdfIn PDF document text
    • http://www.stttekstil.ac.id/elib/repository/daily-free-spins-and-coins-coin-master_GM406889139.pdfIn PDF document text
    • http://www.stttekstil.ac.id/elib/repository/how-to-scam-on-roblox_GM431946152.pdfIn PDF document text
    • http://www.stttekstil.ac.id/elib/repository/free-robux-no-human-verify_GM431946152.pdfIn PDF document text
    • http://www.stttekstil.ac.id/elib/repository/free-roblox-level-7-exploiter-craked-omg_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_002_off000034a7.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x34A7 23032 bytes
SHA-256: 356a2b25a99c420669ef64abee79c6fddc630c26785c08d72372ced7be624141
font_01_sfnt_off00006879.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6879 18240 bytes
SHA-256: ce15f9055fc20859bd8720e1ae39843cc78e3a1a4d12ca4aefcaebee0b1ab8b2

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