Malicious PDF — malware analysis report

Static analysis result for SHA-256 9ec4d953598295e0…

MALICIOUS

PDF

35.6 KB Created: 2021-07-05 17:43:27 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 04a2b55e7c626dab0bffff550e827e1f SHA-1: aa2a259f24eb03236fa9b45cccb37231a98bb551 SHA-256: 9ec4d953598295e0cf2a81e3715ee33c7c56c361002c56ec57555b5e8e369cb0
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a lure for free game currency or hacks, directing users to a known malicious redirector. The embedded URL 'http://netcdn.tw/app/406889139/free-spins-on-coin-master-without-human-verification-game-hack' is associated with malicious redirector infrastructure. While no scripts were explicitly extracted, the PDF structure and heuristic firings strongly suggest a social engineering attack aimed at driving traffic to potentially malicious sites.

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-spins-on-coin-master-without-human-verification-game-hack In PDF document text
    • https://fib.ub.ac.id/sac//repository/what-are-points-for-in-roblox_GM431946152.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/como-tener-robux-gratis-2021-sin-hack_GM431946152.pdfIn PDF document text
    • https://fib.ub.ac.id/sac//repository/coin-master-free-spins-link-download-ios_GM406889139.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/how-to-get-free-robux-and-tix-without-hacking_GM431946152.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/roblox-cheat-engine-alternative_GM431946152.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/aimbot-roblox-free_GM431946152.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/speed-roblox-hack_GM431946152.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/free-roblox-outfits-boys_GM431946152.pdfIn PDF document text
    • https://fib.ub.ac.id/sac//repository/village-coin_GM406889139.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/free-robux-just-enter-username-and-password_GM431946152.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/crazy-roblox-hack_GM431946152.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/coin-master-free-spins-link-2021-ios_GM406889139.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/free-robux-download-apps_GM431946152.pdfIn PDF document text
    • https://fib.ub.ac.id/sac//repository/how-do-you-get-roblox-for-free_GM431946152.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/free-roblox-promo-codes-for-robux_GM431946152.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/roblox-btool-command-without-hacks_GM431946152.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/coin-master-free-spin-and-coin-links_GM406889139.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/202100-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/free-robux-pc-no-human-verification_GM431946152.pdfIn PDF document text
    • https://fib.ub.ac.id/sac//repository/coin-master-free-gifts_GM406889139.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000032a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x32A2 23076 bytes
SHA-256: 2044cccf03d41c0bd86197094780c28bc6ad6d82a3194cf6cb9c424f55ab5cb2
font_01_sfnt_off00006699.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6699 19072 bytes
SHA-256: 27ae5e168144f9143b4eb17c336d82063430b57a560ff005ec1c031da73db6d2

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