Malicious PDF — malware analysis report

Static analysis result for SHA-256 421b5ac00e18b78e…

MALICIOUS

PDF

50.1 KB Created: 2021-06-03 11:19:34 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-16
MD5: a608a8339d9daeac11861f3652a7eebd SHA-1: d7ae288bb11354d3e65bb1bc500ffae05256fd40 SHA-256: 421b5ac00e18b78e90a29f4396e2c2bd74f286e58e4b48116353381e98cf50b3
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links, including one identified as a malicious redirector pointing to 'https://netcdn.online/app/406889139/coin-master-free-snacks-link-game-hack'. This lure, combined with the ML classifier's high confidence, suggests a phishing or scam attempt. The document body, though heavily obfuscated, contains references to game hacks and generators, reinforcing the lure's nature. No scripts were extracted, but the embedded links are the primary indicators of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9734

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 https://netcdn.online/app/406889139/coin-master-free-snacks-link-game-hack In PDF document text
    • http://perpus.masda.ac.id//repository/apps-that-give-you-free-robux_GM431946152.pdfIn PDF document text
    • http://perpus.masda.ac.id//repository/legit-coin-master-hack-without-verification_GM406889139.pdfIn PDF document text
    • http://perpus.masda.ac.id/repository/free-minecraft-account-generator_GM479516143.pdfIn PDF document text
    • http://perpus.masda.ac.id//repository/free-roblox-generator_GM431946152.pdfIn PDF document text
    • http://perpus.masda.ac.id/repository/moonactive-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://perpus.masda.ac.id/repository/roblox-pics_GM431946152.pdfIn PDF document text
    • http://perpus.masda.ac.id/repository/real-robux_GM431946152.pdfIn PDF document text
    • http://perpus.masda.ac.id/repository/tiktok-free-skin-event_GM835599320.pdfIn PDF document text
    • http://perpus.masda.ac.id/repository/earn-robux-today_GM431946152.pdfIn PDF document text
    • http://perpus.masda.ac.id/repository/roblox-data-breach_GM431946152.pdfIn PDF document text
    • http://perpus.masda.ac.id/repository/how-many-levels-are-in-coin-master_GM406889139.pdfIn PDF document text
    • http://perpus.masda.ac.id//repository/coin-master-heaven-free-spins_GM406889139.pdfIn PDF document text
    • http://perpus.masda.ac.id//repository/free-google-play-promo-codes-coin-master_GM406889139.pdfIn PDF document text
    • http://perpus.masda.ac.id/repository/coin-free-master_GM406889139.pdfIn PDF document text
    • http://perpus.masda.ac.id/repository/free-spins-coin-master-no-verification_GM406889139.pdfIn PDF document text
    • http://perpus.masda.ac.id/repository/coin-master-email-rewards-link_GM406889139.pdfIn PDF document text
    • http://perpus.masda.ac.id/repository/get-free-cards-in-coin-master_GM406889139.pdfIn PDF document text
    • http://perpus.masda.ac.id//repository/how-to-make-a-private-server-on-roblox-for-free_GM431946152.pdfIn PDF document text
    • http://perpus.masda.ac.id/repository/coin-master-free-spins-and-coins-link-haktuts_GM406889139.pdfIn PDF document text
    • http://perpus.masda.ac.id//repository/optifine-minecraft-pe_GM479516143.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00005001.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5001 26524 bytes
SHA-256: 0ca6aa090dd331d656091f37770c1d7e3c171a0c444567291189da250ac7244f
font_01_sfnt_off00008c60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8C60 3400 bytes
SHA-256: 75c3a8e6f5c68e0746f893c922e57fd7e888a21fb038f9ae3eedb0a197a59e24
font_02_sfnt_off00009784.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9784 17880 bytes
SHA-256: 09034ee7a1f9989932e9db65c2957a4d9f61d6fccc52a1ac5f57be2128ce07e5
font_03_sfnt_off0000b845.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB845 3264 bytes
SHA-256: e32c06502c11b52acb5e814091c5fdbffd1e2a904ac7a9cfb8b5b180bd139088

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