Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f5bfe5ce3924d91…

MALICIOUS

PDF

45.5 KB Created: 2021-06-03 07:47:49 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 12cc291a9dc50050f3bc1781d80f7ddb SHA-1: 7a0d04341cba4d73e18ebb941dd031d8d23b068e SHA-256: 1f5bfe5ce3924d91231a81a255e15831cff3798a17c43f7d2a65ba1417656e43
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains embedded links that redirect to malicious infrastructure, specifically promoting 'game hacks' and 'free generators'. The ML classifier also flagged this PDF as malicious. The primary attack pattern involves luring users to click these links, likely leading to further malware downloads or phishing attempts. 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 0.9864

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.online/app/431946152/can-i-play-roblox-for-free-game-hack In PDF document text
    • http://perpus.stihpada.ac.id/repository/real-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://perpus.stihpada.ac.id/repository/coin-master-free-spins-and-coins-daily_GM406889139.pdfIn PDF document text
    • http://perpus.stihpada.ac.id/repository/easy-how-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://perpus.stihpada.ac.id/repository/free-coin-master-spins-and-coins_GM406889139.pdfIn PDF document text
    • http://perpus.stihpada.ac.id/repository/coin-master-fan_GM406889139.pdfIn PDF document text
    • http://perpus.stihpada.ac.id/repository/can-i-hack-coin-master-with-lucky-patcher_GM406889139.pdfIn PDF document text
    • http://perpus.stihpada.ac.id/repository/coin-master-free-spins-link-today-hack_GM406889139.pdfIn PDF document text
    • http://perpus.stihpada.ac.id/repository/free-roblox-gift-card_GM431946152.pdfIn PDF document text
    • http://perpus.stihpada.ac.id/repository/free-mojang-account-with-minecraft_GM479516143.pdfIn PDF document text
    • http://perpus.stihpada.ac.id/repository/coin-master-fb-free-spins-link_GM406889139.pdfIn PDF document text
    • http://perpus.stihpada.ac.id/repository/free-roblox-hack-us_GM431946152.pdfIn PDF document text
    • http://perpus.stihpada.ac.id/repository/minecraft-toolbox-premium-apk_GM479516143.pdfIn PDF document text
    • http://perpus.stihpada.ac.id/repository/how-to-get-free-robux-easy-on-phone_GM431946152.pdfIn PDF document text
    • http://perpus.stihpada.ac.id/repository/robux-free-online_GM431946152.pdfIn PDF document text
    • http://perpus.stihpada.ac.id/repository/how-to-use-scripts-in-roblox-hack_GM431946152.pdfIn PDF document text
    • http://perpus.stihpada.ac.id/repository/free-spins-in-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://perpus.stihpada.ac.id/repository/how-to-hack-a-roblox-account-easy_GM431946152.pdfIn PDF document text
    • http://perpus.stihpada.ac.id/repository/minecraft-pc-download-free-full-version_GM479516143.pdfIn PDF document text
    • http://perpus.stihpada.ac.id/repository/coinmaster-spin-ml-link_GM406889139.pdfIn PDF document text
    • http://perpus.stihpada.ac.id/repository/how-to-get-free-robux-on-android_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_off0000521a.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x521A 25876 bytes
SHA-256: 5e4b992d71376d91c1fbf06a8e82d0b65d3c7fe51a52156824e3ac871ffca136
font_01_sfnt_off00008e7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8E7C 18512 bytes
SHA-256: e7c9a4fe6870a820981f50b5265581c9404087a1dcd1112df2882e4616f18a1c

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