Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1d5a84348028895…

MALICIOUS

PDF

45.4 KB Created: 2021-06-04 02:07:27 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-11
MD5: f7937a299973560c968cd6c75e95eb96 SHA-1: ff42291466bd0cb0bc63a0b5f024bb5a823f9ca0 SHA-256: a1d5a84348028895c9e57c3b4b0b28d0bb5231ebddd52acc5a3c51654961a687
180 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to known malicious redirectors, masquerading as free game hacks or generators. The document body, though heavily obfuscated, contains a URL that aligns with the heuristic findings of a redirect lure. The primary malicious activity observed is the redirection to external, untrusted infrastructure, likely for further exploitation or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9864

Heuristics 5

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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.online/app/479516143/free-modded-minecraft-server-game-hack In PDF document text
    • http://lib3tell.stptrisakti.net/repository/https-rbx-place-rewards_GM431946152.pdfIn PDF document text
    • http://lib3tell.stptrisakti.net//repository/roblox-free-executor_GM431946152.pdfIn PDF document text
    • http://lib3tell.stptrisakti.net//repository/how-to-add-mods-to-minecraft-pe_GM479516143.pdfIn PDF document text
    • http://lib3tell.stptrisakti.net/repository/free-spins-generated-from-coin-master_GM406889139.pdfIn PDF document text
    • http://lib3tell.stptrisakti.net/repository/free-robux-pastebin_GM431946152.pdfIn PDF document text
    • http://lib3tell.stptrisakti.net//repository/sites-for-free-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://lib3tell.stptrisakti.net//repository/earn-robux_GM431946152.pdfIn PDF document text
    • http://lib3tell.stptrisakti.net/repository/free-spin-in-coin-master_GM406889139.pdfIn PDF document text
    • http://lib3tell.stptrisakti.net/repository/coin-master-daily-gift-free-spins-and-coins_GM406889139.pdfIn PDF document text
    • http://lib3tell.stptrisakti.net/repository/wurst-client-18-9_GM479516143.pdfIn PDF document text
    • http://lib3tell.stptrisakti.net//repository/free-multiplayer-minecraft-server_GM479516143.pdfIn PDF document text
    • http://lib3tell.stptrisakti.net//repository/claim-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://lib3tell.stptrisakti.net//repository/roblox-survey-for-robux_GM431946152.pdfIn PDF document text
    • http://lib3tell.stptrisakti.net/repository/cool-minecraft-hacks_GM479516143.pdfIn PDF document text
    • http://lib3tell.stptrisakti.net/repository/coin-master-hack-version-2021-download_GM406889139.pdfIn PDF document text
    • http://lib3tell.stptrisakti.net/repository/how-to-get-free-roblox_GM431946152.pdfIn PDF document text
    • http://lib3tell.stptrisakti.net//repository/coins-master-hacks_GM406889139.pdfIn PDF document text
    • http://lib3tell.stptrisakti.net//repository/free-robux-earn_GM431946152.pdfIn PDF document text
    • http://lib3tell.stptrisakti.net//repository/how-to-get-free-spins-on-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://lib3tell.stptrisakti.net//repository/new-free-money-links-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_004_off000055fc.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x55FC 25704 bytes
SHA-256: 60a545b25b0ee0853fe75702cef405da048e5411f3c06b426f3644db8637dd5f
font_01_sfnt_off00008fcf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8FCF 18000 bytes
SHA-256: 088756902f929cbb0d1c0fa5d7f6f3d7dd891fd3cb3329064cb278e0751f8302

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