Malicious PDF — malware analysis report

Static analysis result for SHA-256 14891d5fc1ec7ff1…

MALICIOUS

PDF

33.9 KB Created: 2021-07-03 13:56:50 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 0ef00511c666d1c91a09cf02d7ffca74 SHA-1: c7d1a328cb8b35804204d274c23a6ec2ee0b0418 SHA-256: 14891d5fc1ec7ff1ec52ac69eef386e89461eb7912dfd5f7071cbfa388ca72e3
160 Risk Score

Malware Insights

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

The PDF contains multiple links to a known malicious redirector infrastructure, specifically http://netcdn.tw/app/406889139/link-coin-master-game-hack, which is presented as a 'free generator / game hack'. The document body and extracted URLs reinforce this lure by referencing popular games and hacks. While no scripts were extracted, the PDF structure and embedded links strongly suggest a malicious redirection chain designed to deliver a secondary payload or phish users.

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/link-coin-master-game-hack In PDF document text
    • https://fib.ub.ac.id/sac/repository/infinte-fly-hack-for-roblox_GM431946152.pdfIn PDF document text
    • https://fib.ub.ac.id/sac//repository/roblox-free-item-codes_GM431946152.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/how-to-get-free-robux-on-pc_GM431946152.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/hacker-of-roblox-that-log-into-your-account_GM431946152.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/free-diamonds-coin-master_GM406889139.pdfIn PDF document text
    • https://fib.ub.ac.id/sac//repository/coinmasterfree_GM406889139.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/greenville-roblox-money-hack_GM431946152.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/minecraft-mods-download-free_GM479516143.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/how-to-get-free-robux-on-roblox-no-download_GM431946152.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/coin-master-free-spins-for-today_GM406889139.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/generate-free-robux-gift-card_GM431946152.pdfIn PDF document text
    • https://fib.ub.ac.id/sac//repository/free-spins-in-coin-master-2021_GM406889139.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/free-robux-generator-no-human-verification-2021_GM431946152.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/admin-hack-roblox-dowload_GM431946152.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/free-2021-robux_GM431946152.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/coin-master-daily-gift-free-spins-and-coins-link_GM406889139.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/minecraft-free-app_GM479516143.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/cute-free-roblox-outfits_GM431946152.pdfIn PDF document text
    • https://fib.ub.ac.id/sac//repository/archery-master-3d-unlimited-coins-hack_GM406889139.pdfIn PDF document text
    • https://fib.ub.ac.id/sac/repository/coin-master-daily-free-spins-link-facebook_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
stream_002_off00002f68.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x2F68 22764 bytes
SHA-256: b0bebf7a75b4b46a2653ad593efbaaf13830daa234ed911ccf344594b74b4510
font_01_sfnt_off000062a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x62A2 18004 bytes
SHA-256: ef7269f0b071a879a9f7db5de516efddf8210eda88d8ea04d9509c84f546983d

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