Malicious PDF — malware analysis report

Static analysis result for SHA-256 d86d8e7f15678724…

MALICIOUS

PDF

48.3 KB Created: 2021-06-08 18:28:15 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 082bf827f78dfc0322f9035c5f92d191 SHA-1: f1398de2623175844b6d18bc9a664a7fd2e8bc95 SHA-256: d86d8e7f156787241ae87a16636ac42c5aafdc71b337cd4ac5d442e7cfa1fe7a
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, disguised as a 'free generator / game hack'. The ML classifier also flagged this PDF as malicious. While no scripts were extracted, the embedded URLs and the nature of the lure strongly suggest the document is designed to lead the user to a malicious website, likely for further exploitation or phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9796

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.tw/app/431946152/roblox-free-game-play-no-download-game-hack In PDF document text
    • http://perpus.unik-kediri.ac.id/repository/robux-come_GM431946152.pdfIn PDF document text
    • http://perpus.unik-kediri.ac.id/repository/free-followers-on-tiktok_GM835599320.pdfIn PDF document text
    • http://perpus.unik-kediri.ac.id/repository/get-coin-master-cards-free_GM406889139.pdfIn PDF document text
    • http://perpus.unik-kediri.ac.id/repository/coin-master-villages_GM406889139.pdfIn PDF document text
    • http://perpus.unik-kediri.ac.id/repository/free-robux-promo-codes_GM431946152.pdfIn PDF document text
    • http://perpus.unik-kediri.ac.id/repository/how-do-you-get-roblox-money_GM431946152.pdfIn PDF document text
    • http://perpus.unik-kediri.ac.id/repository/static-moonactive-net-rewards-2021_GM406889139.pdfIn PDF document text
    • http://perpus.unik-kediri.ac.id/repository/free-robux-without-human-verification-real_GM431946152.pdfIn PDF document text
    • http://perpus.unik-kediri.ac.id/repository/free-robux-mobile_GM431946152.pdfIn PDF document text
    • http://perpus.unik-kediri.ac.id/repository/coin-master-hack-version-33-2_GM406889139.pdfIn PDF document text
    • http://perpus.unik-kediri.ac.id/repository/25-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://perpus.unik-kediri.ac.id/repository/battle-royale-roblox-hack_GM431946152.pdfIn PDF document text
    • http://perpus.unik-kediri.ac.id/repository/coin-master-hacks-for-iphone_GM406889139.pdfIn PDF document text
    • http://perpus.unik-kediri.ac.id/repository/can-i-have-robux_GM431946152.pdfIn PDF document text
    • http://perpus.unik-kediri.ac.id/repository/free-coin-master-cards_GM406889139.pdfIn PDF document text
    • http://perpus.unik-kediri.ac.id/repository/coin-master-hack-version-download_GM406889139.pdfIn PDF document text
    • http://perpus.unik-kediri.ac.id/repository/free-robux-codes-2021_GM431946152.pdfIn PDF document text
    • http://perpus.unik-kediri.ac.id/repository/roblox-account-taker_GM431946152.pdfIn PDF document text
    • http://perpus.unik-kediri.ac.id/repository/how-to-hack-roblox-jailbreak_GM431946152.pdfIn PDF document text
    • http://perpus.unik-kediri.ac.id/repository/free-coin-master-stuff_GM406889139.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off000051e3.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x51E3 25556 bytes
SHA-256: 1747e76821ac7f8468866af46c742fed74c4bfa977c900d69007ea7c3a254eb2
font_01_sfnt_off00008cec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8CEC 2984 bytes
SHA-256: 2df87bbe4e27b27e34c872c092d0522acd977d05f5cbde7ed5e1fdfeb59cb318
font_02_sfnt_off0000973a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x973A 19276 bytes
SHA-256: e882eace551a007da887ff2f361dffb1685bae7a510e5e7cdb9fe2eae1d8c1ca

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