Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f81372f4fde8337…

MALICIOUS

PDF

42.8 KB Created: 2021-06-13 23:23:03 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-24
MD5: fa53d61f6226b78fa0b06ab97e49bceb SHA-1: 091076907b8bc6613d12041b3361d022f6c7114c SHA-256: 4f81372f4fde83374ab718a77e1ce4363a2fc15521302118972cabba7d7b0312
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to a known malicious redirector, specifically advertising a "free generator / game hack" for Roblox. The document body, though partially corrupted, contains text related to Roblox hacks and a URL that aligns with the heuristic findings. The presence of embedded URLs and the nature of the lure suggest a phishing or scam attempt, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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.co/app/431946152/free-pin-to-redeem-roblox-game-hack In PDF document text
    • https://perpustakaan.iahntp.ac.id/repository/roblox-hack-ro-ghoul_GM431946152.pdfIn PDF document text
    • http://perpustakaan.iahntp.ac.id/repository/free-500-tiktok-likes_GM835599320.pdfIn PDF document text
    • https://perpustakaan.iahntp.ac.id/repository/how-to-get-free-roblox-items-using-coding_GM431946152.pdfIn PDF document text
    • http://perpustakaan.iahntp.ac.id/repository/free-spins-on-coin-master-game_GM406889139.pdfIn PDF document text
    • https://perpustakaan.iahntp.ac.id/repository/free-roblox-accounts-to-use_GM431946152.pdfIn PDF document text
    • http://perpustakaan.iahntp.ac.id/repository/i-want-free-robux_GM431946152.pdfIn PDF document text
    • http://perpustakaan.iahntp.ac.id/repository/free-draw-2-roblox_GM431946152.pdfIn PDF document text
    • http://perpustakaan.iahntp.ac.id/repository/how-to-get-free-coins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://perpustakaan.iahntp.ac.id/repository/free-robux-com-2021_GM431946152.pdfIn PDF document text
    • http://perpustakaan.iahntp.ac.id/repository/free-robux-no-verification-required_GM431946152.pdfIn PDF document text
    • http://perpustakaan.iahntp.ac.id/repository/how-to-get-free-money-on-arsenal-roblox_GM431946152.pdfIn PDF document text
    • http://perpustakaan.iahntp.ac.id/repository/new-figer-hack-pastbin-roblox_GM431946152.pdfIn PDF document text
    • http://perpustakaan.iahntp.ac.id/repository/minecraft-free-games-no-download_GM479516143.pdfIn PDF document text
    • http://perpustakaan.iahntp.ac.id/repository/how-to-play-minecraft-for-free_GM479516143.pdfIn PDF document text
    • http://perpustakaan.iahntp.ac.id/repository/free-robux-obby-by-elevanoz_GM431946152.pdfIn PDF document text
    • http://perpustakaan.iahntp.ac.id/repository/pubg-uc-20210_GM1330123889.pdfIn PDF document text
    • http://perpustakaan.iahntp.ac.id/repository/instagram-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • http://perpustakaan.iahntp.ac.id/repository/how-to-make-free-robux_GM431946152.pdfIn PDF document text
    • http://perpustakaan.iahntp.ac.id/repository/coin-master-pc-game-free-download_GM406889139.pdfIn PDF document text
    • https://perpustakaan.iahntp.ac.id/repository/hack-nuevo-para-roblox-2021_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_003_off00004aef.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4AEF 24772 bytes
SHA-256: 265704c49087734b1f1a5f02e898bea6a345538e8e841304e405924ba7e870c4
font_01_sfnt_off0000840e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x840E 18656 bytes
SHA-256: da8183ff0943162688a09c6fd1aacf756de884eaae042a7c7836190bec8e0dba

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