Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1486ba69d0601dd…

MALICIOUS

PDF

34.0 KB Created: 2021-07-05 09:47:34 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-23
MD5: f066cf39d42574bf5b8f05fbded96157 SHA-1: 5291420f7b07bfec00f346d8000b0a7d58261e18 SHA-256: c1486ba69d0601dd35e80075efe16ceec64fd23bde5f01b43880a66ef8785844
180 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a malformed stream and multiple links to known malicious redirector infrastructure, specifically advertising "free generator / game hack" lures. The primary malicious link is http://netcdn.tw/app/431946152/free-roblox-card-codes-game-hack, which is designed to trick users into downloading further malware or engaging in scams. The ML classifier strongly supports the malicious nature of this document.

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.
  • 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.tw/app/431946152/free-roblox-card-codes-game-hack In PDF document text
    • http://muslib.unmus.ac.id/repository/actual-free-robux_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/roblox-adidas-t-shirt-free_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/coin-master-cards-free_GM406889139.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/robux-free-real-2021_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id//repository/avatar-the-last-airbender-roblox_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/how-to-earn-free-stars-on-coin-master_GM406889139.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/coin-master-hack-2021-free_GM406889139.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/reaper-quest-cheats-engine-roblox_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/free-draw-roblox_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/coin-master-hack-2021-download_GM406889139.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/free-robux-hack-us_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id//repository/pokemon-go-free-qwilfish_GM1094591345.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/coin-master-free-spins-twitter_GM406889139.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/how-to-hack-roblox-free-robux-no-survey_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id//repository/how-to-make-a-private-server-on-roblox-for-free_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/links-to-get-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/free-robux-codes-no-verification-2021_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/roblox-aockolupse-hack-mod-menu_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/get-roebucks-com_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/how-to-play-roblox-liberty-county-for-free_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
font_00_sfnt_off00002fef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2FEF 22040 bytes
SHA-256: 845739f30f4555769f696c6d7ff225f019ad874a37cc0c4e9b8573f4b15bfcb3
font_01_sfnt_off00006064.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6064 18824 bytes
SHA-256: 5863a25f68c4dee89f1f332a8beb3d1800c88bf377be75211d7322c344e9e5bb

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