Malicious PDF — malware analysis report

Static analysis result for SHA-256 bdd1f138c37f1779…

MALICIOUS

PDF

34.0 KB Created: 2021-07-05 14:33:37 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 68fc7a4366ae71a1bd3b13895495b7a5 SHA-1: a7ac5ef70aea39ed03feee92b11a1282152fefdd SHA-256: bdd1f138c37f1779b143bfc8fe739c4d92f755ddc313e4aae31d20b29d8d2e06
160 Risk Score

Malware Insights

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

The PDF document contains a critical heuristic firing for a game hack redirector lure, pointing to malicious infrastructure. The embedded URL, 'http://netcdn.tw/app/406889139/hack-para-coin-master-singapore-game-hack', is identified as a malicious redirector. The document body and heuristics suggest a social engineering tactic to trick users into clicking the link, likely leading to further malware download or exploitation.

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/hack-para-coin-master-singapore-game-hack In PDF document text
    • https://fib.ub.ac.id/sac//repository/www-coin-master_GM406889139.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/how-to-hack-any-roblox-account-june-2021_GM431946152.pdfIn PDF document text
    • https://fib.ub.ac.id/sac//repository/games-on-roblox-that-give-you-free-robux_GM431946152.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/cheat-engine-roblox-bypass-download_GM431946152.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/how-to-get-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/free-online-roblox-tycoons_GM431946152.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/free-roblox-accounts-lost-pin_GM431946152.pdfIn PDF document text
    • https://fib.ub.ac.id/sac//repository/coin-master-hack-without-verification-ios_GM406889139.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/compte-roblox-hack_GM431946152.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/free-robux-no-verification-or-survey_GM431946152.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/free-coin-master-cards_GM406889139.pdfIn PDF document text
    • https://fib.ub.ac.id/sac//repository/roblox-phantom-forces-hack_GM431946152.pdfIn PDF document text
    • https://fib.ub.ac.id/sac//repository/how-to-get-free-spins-on-coin-master-2021_GM406889139.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/coin-master-hack-tool-pc-download_GM406889139.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/roblox-how-to-hack-into-someones-account-2021_GM431946152.pdfIn PDF document text
    • https://fib.ub.ac.id/sac//repository/how-to-get-free-cards-sets-for-coin-master_GM406889139.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/free-roblox-accounts-with-bc-and-robux_GM431946152.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/minecraft-18-9-hacked-client_GM479516143.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/can-i-download-roblox-for-ps3-free_GM431946152.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/how-to-get-a-refund-on-roblox-2021_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_off00002eb3.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x2EB3 22952 bytes
SHA-256: 2092843c8043ac7d499b97fbd52d746e6a3d54be7e19238dee4b7b3cc2e82312
font_01_sfnt_off00006224.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6224 18332 bytes
SHA-256: 7a06b268a0635f8a5522d84c5da66ca6895134d44174cfdc6223da1b32f7b83a

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