Malicious PDF — malware analysis report

Static analysis result for SHA-256 1ffa86a218f46bc7…

MALICIOUS

PDF

32.6 KB Created: 2021-07-06 00:38:56 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 8a3ac827497e0924a312e67c013abbba SHA-1: a9f0cefab6e3fef339d6874787054515f23de56d SHA-256: 1ffa86a218f46bc77a0902efba50157a779c1f57e3fcc4c2185f09ceb6aab505
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links that redirect to malicious infrastructure, specifically promoting game hacks and free currency. The primary lure URL is http://netcdn.tw/app/406889139/free-spins-coin-master-legit-game-hack, which is flagged as a malicious redirector. While no scripts were explicitly extracted, the PDF structure and embedded links suggest a social engineering tactic to drive users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9824

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-coin-master-legit-game-hack In PDF document text
    • http://perpustakaan.pn-raha.go.id/repository/free-robux-that-actually-works_GM431946152.pdfIn PDF document text
    • http://perpustakaan.pn-raha.go.id/repository/roblox-vip-shirts-for-free_GM431946152.pdfIn PDF document text
    • http://perpustakaan.pn-raha.go.id/repository/how-to-hack-into-anyones-account-roblox_GM431946152.pdfIn PDF document text
    • http://perpustakaan.pn-raha.go.id/repository/roblox-hack-by-robuxian_GM431946152.pdfIn PDF document text
    • http://perpustakaan.pn-raha.go.id/repository/robux-com-free_GM431946152.pdfIn PDF document text
    • http://perpustakaan.pn-raha.go.id/repository/cheat-roblox-one-piece-wrath_GM431946152.pdfIn PDF document text
    • http://perpustakaan.pn-raha.go.id/repository/haktuts-coin-master-free-spin-link_GM406889139.pdfIn PDF document text
    • http://perpustakaan.pn-raha.go.id/repository/how-to-change-my-name-in-roblox-for-free_GM431946152.pdfIn PDF document text
    • http://perpustakaan.pn-raha.go.id/repository/roblox-arsenal-hack_GM431946152.pdfIn PDF document text
    • http://perpustakaan.pn-raha.go.id/repository/coin-master-tricks-and-hacks_GM406889139.pdfIn PDF document text
    • http://perpustakaan.pn-raha.go.id/repository/free-robux-generator-no-verification_GM431946152.pdfIn PDF document text
    • http://perpustakaan.pn-raha.go.id/repository/100-free-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://perpustakaan.pn-raha.go.id/repository/fre-chain-shirts-roblox_GM431946152.pdfIn PDF document text
    • http://perpustakaan.pn-raha.go.id/repository/free-robux-codes-prank-code_GM431946152.pdfIn PDF document text
    • http://perpustakaan.pn-raha.go.id/repository/how-do-you-get-free-robux_GM431946152.pdfIn PDF document text
    • http://perpustakaan.pn-raha.go.id/repository/get-free-robux-com_GM431946152.pdfIn PDF document text
    • http://perpustakaan.pn-raha.go.id/repository/roblox-robux-hack-2021-2021-working-no-password-unpatchable_GM431946152.pdfIn PDF document text
    • http://perpustakaan.pn-raha.go.id/repository/how-to-hack-robux-with-cheat-engine-2021_GM431946152.pdfIn PDF document text
    • http://perpustakaan.pn-raha.go.id/repository/how-to-hack-people-on-roblox-without-downloads_GM431946152.pdfIn PDF document text
    • http://perpustakaan.pn-raha.go.id/repository/80-free-spins-coin-master_GM406889139.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_001_off00002b01.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x2B01 22544 bytes
SHA-256: 82d5abdeabec72a680e154cc404aa068d3eec4e1f9856e99bffc423151b42106
font_01_sfnt_off00005d3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5D3E 18176 bytes
SHA-256: 7af7e664eae1258314b3ede69216354f229cfa04ce1bca37a5b2e9287da6bc4d

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