Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc1596371de528a8…

MALICIOUS

PDF

33.9 KB Created: 2021-07-05 23:33:13 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-26
MD5: f62b9823bf7d3afa23a5cf3a92796bbb SHA-1: eaa35b499edbcf36cf078545188b5caca2b75162 SHA-256: bc1596371de528a82a9e3bb365b342aa9ce24b9dbaf5699917febbe49d73a67e
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains embedded URLs that lead to a known malicious redirector, masquerading as a generator for free game currency and hacks. The document body and heuristics indicate a lure designed to trick users into clicking malicious links, likely for credential harvesting or further malware delivery. No scripts were extracted, but the presence of malicious redirector links is a strong indicator of malicious intent.

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/431946152/free-robux-card-codes-game-hack In PDF document text
    • http://library.acehresearch.org/repository/free-codes-to-get-robux_GM431946152.pdfIn PDF document text
    • http://library.acehresearch.org/repository/best-free-roblox-outfits_GM431946152.pdfIn PDF document text
    • http://library.acehresearch.org/repository/roblox-build-a-boat-free-plane-codes_GM431946152.pdfIn PDF document text
    • http://library.acehresearch.org/repository/free-coin-master-hacks-no-verification-or-survey_GM406889139.pdfIn PDF document text
    • http://library.acehresearch.org/repository/roblox-pet-simulator-free-game-passes_GM431946152.pdfIn PDF document text
    • http://library.acehresearch.org/repository/minecraft-wurst-hacked-client_GM479516143.pdfIn PDF document text
    • http://library.acehresearch.org/repository/how-to-use-cheat-engine-63-on-roblox_GM431946152.pdfIn PDF document text
    • http://library.acehresearch.org/repository/roblox-apocalypse-rising-hack_GM431946152.pdfIn PDF document text
    • http://library.acehresearch.org/repository/spin-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://library.acehresearch.org/repository/how-to-get-2021-robux-free-no-download-2021_GM431946152.pdfIn PDF document text
    • http://library.acehresearch.org/repository/free-clothing-roblox-group_GM431946152.pdfIn PDF document text
    • http://library.acehresearch.org/repository/brdarski-free-robux_GM431946152.pdfIn PDF document text
    • http://library.acehresearch.org/repository/what-are-the-memory-codes-for-roblox-cheats_GM431946152.pdfIn PDF document text
    • http://library.acehresearch.org/repository/free-robux-hack-generator-2021-no-human-verification-or-survey_GM431946152.pdfIn PDF document text
    • http://library.acehresearch.org/repository/tiktok-free-view-iphone-5c_GM835599320.pdfIn PDF document text
    • http://library.acehresearch.org/repository/god-mode-hack-roblox-2021_GM431946152.pdfIn PDF document text
    • http://library.acehresearch.org/repository/wurst-mc_GM479516143.pdfIn PDF document text
    • http://library.acehresearch.org/repository/hacked-roblox-accounts-list_GM431946152.pdfIn PDF document text
    • http://library.acehresearch.org/repository/how-to-get-1-million-robux-for-free-2021_GM431946152.pdfIn PDF document text
    • http://library.acehresearch.org/repository/how-to-hack-arsenal-roblox_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
font_00_sfnt_off00002e64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2E64 22272 bytes
SHA-256: a5d6dcaa07a393355c327e98521981ddee711c7a13814f339d66a884e46cfe1a
font_01_sfnt_off00005fec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5FEC 18888 bytes
SHA-256: 6c6de0ceaed5fc014d3dcce92ca1cb896bf7995edf6e50a0e815779b2f83a656

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