Malicious PDF — malware analysis report

Static analysis result for SHA-256 21b02d9941b7b836…

MALICIOUS

PDF

34.7 KB Created: 2021-07-06 14:09:44 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-26
MD5: bab389a562d505f17fc03b3784c6a10d SHA-1: 5bc7142e6a7e27a34f2096e378144a178c234864 SHA-256: 21b02d9941b7b836d5f16fdba79642f3da8ec574ba2c711df2ffd9947ac16874
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links, including one pointing to a known malicious redirector infrastructure. The document body and extracted links suggest a lure related to game hacks or free in-game currency, a common social engineering tactic. While no scripts were explicitly extracted, the presence of embedded URLs and the ML classifier's high confidence indicate malicious intent, likely leading to further compromise.

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/479516143/bad-minecraft-free-game-hack In PDF document text
    • http://digilibfisip.unla.ac.id/repository/rbxcity-roblox-free-robux_GM431946152.pdfIn PDF document text
    • http://digilibfisip.unla.ac.id/repository/roblox-promo-codes-to-get-free-robux-2021_GM431946152.pdfIn PDF document text
    • http://digilibfisip.unla.ac.id/repository/how-to-get-free-robux-without-paying_GM431946152.pdfIn PDF document text
    • http://digilibfisip.unla.ac.id/repository/how-to-hack-roblox-servers-2021_GM431946152.pdfIn PDF document text
    • http://digilibfisip.unla.ac.id/repository/roblox-weird_GM431946152.pdfIn PDF document text
    • http://digilibfisip.unla.ac.id/repository/chostaty-roblox-hack_GM431946152.pdfIn PDF document text
    • http://digilibfisip.unla.ac.id/repository/games-on-roblox-that-give-you-free-robux_GM431946152.pdfIn PDF document text
    • http://digilibfisip.unla.ac.id/repository/free-spins-from-coin-master_GM406889139.pdfIn PDF document text
    • http://digilibfisip.unla.ac.id/repository/free-roblox-skins-stampycat_GM431946152.pdfIn PDF document text
    • http://digilibfisip.unla.ac.id/repository/how-to-hack-minecraft_GM479516143.pdfIn PDF document text
    • http://digilibfisip.unla.ac.id/repository/robloxgiveaway-xyz-hack-robux_GM431946152.pdfIn PDF document text
    • http://digilibfisip.unla.ac.id/repository/free-auto-clicker-roblox_GM431946152.pdfIn PDF document text
    • http://digilibfisip.unla.ac.id/repository/roblox-denisdaily-free-robux_GM431946152.pdfIn PDF document text
    • http://digilibfisip.unla.ac.id/repository/how-to-get-500-robux-for-free-2021_GM431946152.pdfIn PDF document text
    • http://digilibfisip.unla.ac.id/repository/roblox-how-to-get-free-obc-2021_GM431946152.pdfIn PDF document text
    • http://digilibfisip.unla.ac.id/repository/roblox-robux-page_GM431946152.pdfIn PDF document text
    • http://digilibfisip.unla.ac.id/repository/coin-master-cheats-2021_GM406889139.pdfIn PDF document text
    • http://digilibfisip.unla.ac.id/repository/hack-download_GM431946152.pdfIn PDF document text
    • http://digilibfisip.unla.ac.id/repository/how-to-hack-diamonds-roblox-murder-mystery-2_GM431946152.pdfIn PDF document text
    • http://digilibfisip.unla.ac.id/repository/roblox-free-premium-method-v3rm_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_off000033df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x33DF 22268 bytes
SHA-256: fbe8f599b81f1e776bb668216024a6ed9a8ad7e62073e7b37ccb796afacd04e7
font_01_sfnt_off00006528.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6528 18248 bytes
SHA-256: 4aba1dd6cc01965d6b6215da11c039b33948f2b192d52beaea5b71c00603ea7c

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