Malicious PDF — malware analysis report

Static analysis result for SHA-256 86bb21af5d17f4b1…

MALICIOUS

PDF

35.8 KB Created: 2021-07-04 15:15:05 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 13b61b863161c1583cb74945ce7ff662 SHA-1: ad6787e24bb03ca9554396ead9f83dd180ec991c SHA-256: 86bb21af5d17f4b15433d4e138249621678ddf24fe787eedf84075161cea42ef
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links to redirector infrastructure, specifically advertising 'free generators' and 'hacks' for popular games. The primary malicious URL identified is http://netcdn.tw/app/406889139/free-card-collection-in-coin-master-game-hack, which is flagged as a known malicious redirector. The document body and embedded links suggest a social engineering lure to trick users into visiting these malicious sites, likely to download further malware or engage in scams.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 4

  • 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.
  • 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/free-card-collection-in-coin-master-game-hack In PDF document text
    • https://digilib.stimlog.ac.id/repository/free-script-executor-roblox_GM431946152.pdfIn PDF document text
    • http://digilib.stimlog.ac.id/repository/how-to-get-free-robux-on-roblox-october-2021_GM431946152.pdfIn PDF document text
    • http://digilib.stimlog.ac.id/repository/how-to-get-free-robux-no-verification-2021_GM431946152.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/cheat-codes-for-coin-master_GM406889139.pdfIn PDF document text
    • http://digilib.stimlog.ac.id/repository/roblox-free-robux-hack_GM431946152.pdfIn PDF document text
    • http://digilib.stimlog.ac.id/repository/how-to-host-a-minecraft-server-for-free_GM479516143.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/how-do-you-get-free-robux-on-ipad-2021_GM431946152.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/heroes-online-roblox-free_GM431946152.pdfIn PDF document text
    • http://digilib.stimlog.ac.id/repository/coin-master-free-spins-hack-ios_GM406889139.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/how-to-make-clothes-on-roblox-for-free-2021_GM431946152.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/cheat-roblox-phantom-forces-2021_GM431946152.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/create-free-group-roblox_GM431946152.pdfIn PDF document text
    • http://digilib.stimlog.ac.id/repository/how-to-get-free-spins-on-coin-master-without-verification_GM406889139.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/roblox-lumber-tycoon-2-cheat-engine-tutorial_GM431946152.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/the-only-free-robux-game-that-works-1_GM431946152.pdfIn PDF document text
    • http://digilib.stimlog.ac.id/repository/free-roblox-games-scripts_GM431946152.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/roblox-radio-script-pastebin-hack_GM431946152.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/coin-master-free-spins-and-cards_GM406889139.pdfIn PDF document text
    • http://digilib.stimlog.ac.id/repository/how-to-get-speed-cheat-in-roblox_GM431946152.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/hacker-bubble-gum-simulator-de-roblox-fr_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_off0000336d.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x336D 23752 bytes
SHA-256: 9310518db6f2bb00145c898c3fb23b8ee14d18102a014129dbf04d2a73144b83
font_01_sfnt_off00006997.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6997 18244 bytes
SHA-256: f83f39971f031133d9ac19f4d0176cfde7e71f4c6078ff94cde1d0a05c77e137

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