Malicious PDF — malware analysis report

Static analysis result for SHA-256 154409efc21eb164…

MALICIOUS

PDF

35.3 KB Created: 2021-06-29 06:50:26 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-31
MD5: 67abc9cad7db200e756b8a6ff0e7df06 SHA-1: 58137c4896ae1ca912e70a14a5d00d5f41e7b00f SHA-256: 154409efc21eb16487bf00ee5d65ea20fa31030eb5d0a85bd1c4adfe0322ceed
240 Risk Score

Malware Insights

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

This PDF file contains multiple links to external websites, including a known malicious redirector, that promise free game currency or hacks. The document's structure and embedded links suggest it is designed to lure users to these malicious sites, likely leading to further malware downloads or scams. The malformed stream length heuristic indicates an attempt to hide malicious content within the PDF structure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 6

  • 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.
  • Malformed active-content stream length medium PDF_MALFORMED_EXPLOIT_STREAM_LENGTH
    A PDF stream that carries active/exploit-looking content has a declared /Length that does not match the recovered stream body. Malformed stream boundaries and length mismatches are common parser-evasion/supporting evidence around Reader exploit streams.
  • 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/is-roblox-free-onphones-game-hack In PDF document text
    • http://digilib.stiki.ac.id/repository/coin-master-free-spins-iphone-2021_GM406889139.pdfIn PDF document text
    • http://digilib.stiki.ac.id/repository/vehicule-simulator-roblox-hack_GM431946152.pdfIn PDF document text
    • http://digilib.stiki.ac.id/repository/how-to-get-free-robux-easy-hack_GM431946152.pdfIn PDF document text
    • http://digilib.stiki.ac.id/repository/free-robux-without-human-verification_GM431946152.pdfIn PDF document text
    • http://digilib.stiki.ac.id/repository/coin-master-free-spins-blogspot_GM406889139.pdfIn PDF document text
    • http://digilib.stiki.ac.id/repository/generator-robux_GM431946152.pdfIn PDF document text
    • http://digilib.stiki.ac.id/repository/free-paint-hwo-to-draw-a-realist-eye-roblox_GM431946152.pdfIn PDF document text
    • http://digilib.stiki.ac.id/repository/coin-master-hack-xyz-download-free_GM406889139.pdfIn PDF document text
    • http://digilib.stiki.ac.id/repository/roblox-tycoons-free_GM431946152.pdfIn PDF document text
    • http://digilib.stiki.ac.id/repository/roblox-no-clip-hack_GM431946152.pdfIn PDF document text
    • http://digilib.stiki.ac.id/repository/how-to-hack-coin-master-using-es-file_GM406889139.pdfIn PDF document text
    • http://digilib.stiki.ac.id/repository/skyline-reviewed-roblox-hack_GM431946152.pdfIn PDF document text
    • http://digilib.stiki.ac.id/repository/games-like-minecraft-but-free_GM479516143.pdfIn PDF document text
    • http://digilib.stiki.ac.id/repository/coin-master-free-spins-link-may-2021_GM406889139.pdfIn PDF document text
    • http://digilib.stiki.ac.id/repository/free-robux-codes-no-verification_GM431946152.pdfIn PDF document text
    • http://digilib.stiki.ac.id/repository/como-hackear-juego-coin-master_GM406889139.pdfIn PDF document text
    • http://digilib.stiki.ac.id/repository/how-to-play-minecraft-for-free_GM479516143.pdfIn PDF document text
    • http://digilib.stiki.ac.id/repository/best-free-minecraft-hacked-client_GM479516143.pdfIn PDF document text
    • http://digilib.stiki.ac.id/repository/blox-pink-robux-free_GM431946152.pdfIn PDF document text
    • http://digilib.stiki.ac.id/repository/wurst-client-18-9_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_off000031fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x31FD 22808 bytes
SHA-256: 444389dffb4bd6ff4724fdfd086a2e0238aa67e6bc2b005420b9a8bd30bb4277
font_01_sfnt_off00006517.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6517 18992 bytes
SHA-256: 6858456b3954721bfe34399eb4f37c6871c5992c64bb38f4a821914615c6a63c

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