Malicious PDF — malware analysis report

Static analysis result for SHA-256 f71b5dbe479e528f…

MALICIOUS

PDF

45.4 KB Created: 2021-06-11 11:54:19 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: c63695b97825705b80f34aadc805f988 SHA-1: 69ce840fe1503032d000aa715d1fec687a77d73f SHA-256: f71b5dbe479e528f366ea9c0896b9e061b8d7e4906a098886645df80f7f4d51a
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a direct link to a known malicious redirector infrastructure, disguised as a 'free generator / game hack'. The document body and numerous extracted URLs reinforce this lure, aiming to trick users into visiting potentially harmful sites. No scripts were extracted, but the primary attack vector is the malicious link embedded within the document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9864

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/free-empty-roblox-accounts-game-hack In PDF document text
    • http://perpus.stikesphi.ac.id/repository/free-bobux_GM431946152.pdfIn PDF document text
    • http://perpus.stikesphi.ac.id/repository/free-executors-for-roblox_GM431946152.pdfIn PDF document text
    • http://perpus.stikesphi.ac.id/repository/free-roblox-script-executor_GM431946152.pdfIn PDF document text
    • http://perpus.stikesphi.ac.id/repository/free-robux-100-real-no-survey_GM431946152.pdfIn PDF document text
    • http://perpus.stikesphi.ac.id/repository/free-robux-working_GM431946152.pdfIn PDF document text
    • http://perpus.stikesphi.ac.id/repository/coin-master-free-cards-link_GM406889139.pdfIn PDF document text
    • http://perpus.stikesphi.ac.id/repository/roblox-free-codes-2021_GM431946152.pdfIn PDF document text
    • http://perpus.stikesphi.ac.id/repository/coin-master-free-daily-spins_GM406889139.pdfIn PDF document text
    • http://perpus.stikesphi.ac.id/repository/free-roblox-username-changer_GM431946152.pdfIn PDF document text
    • http://perpus.stikesphi.ac.id/repository/free-robux-on-phone_GM431946152.pdfIn PDF document text
    • http://perpus.stikesphi.ac.id/repository/free-2021-robux_GM431946152.pdfIn PDF document text
    • http://perpus.stikesphi.ac.id/repository/roblox-hack-2021_GM431946152.pdfIn PDF document text
    • http://perpus.stikesphi.ac.id/repository/coin-master-download-hack-ios_GM406889139.pdfIn PDF document text
    • http://perpus.stikesphi.ac.id/repository/roblox-hack-download_GM431946152.pdfIn PDF document text
    • http://perpus.stikesphi.ac.id/repository/coin-master-free-spins-2021-app-download_GM406889139.pdfIn PDF document text
    • http://perpus.stikesphi.ac.id/repository/feb-23-2021-free-coin-master-spins_GM406889139.pdfIn PDF document text
    • http://perpus.stikesphi.ac.id/repository/minecraft-hacked-client-18_GM479516143.pdfIn PDF document text
    • http://perpus.stikesphi.ac.id/repository/coin-master-free-cards-hack_GM406889139.pdfIn PDF document text
    • http://perpus.stikesphi.ac.id/repository/minecraft-building-hacks_GM479516143.pdfIn PDF document text
    • http://perpus.stikesphi.ac.id/repository/robux-fun-hack_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_004_off00004e38.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4E38 27632 bytes
SHA-256: 932362f494b9ef3a7afad4d1ce45183f91cb67554dd9bdd9ef7ae3557079fd17
font_01_sfnt_off00008d62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8D62 18808 bytes
SHA-256: 0d778387ac49b4a325ac2afd07f5a48366eeaaad58630a6e4a95e0d5b81ed562

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