Malicious PDF — malware analysis report

Static analysis result for SHA-256 401f5721b6ee5ca5…

MALICIOUS

PDF

34.6 KB Created: 2021-06-30 01:05:12 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 6d1648010fd275c45fd22b5e67243b9f SHA-1: 30cd1bd6a06d6802f3be5175f2926e09ff2af78e SHA-256: 401f5721b6ee5ca5505b5a9a19ca9f5d78908b814157eb1f5c6a9c119740ecb8
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to redirectors and known malicious infrastructure, disguised as game hacks and generators. The 'PDF_GAME_HACK_REDIRECT_LURE' and 'PDF_MALICIOUS_REDIRECTOR_LINK' heuristics indicate a high likelihood of malicious intent. Although no scripts were extracted, the embedded URLs and the nature of the lures suggest the document is designed to trick users into downloading further malware or visiting malicious sites.

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.co/app/431946152/green-hacked-roblox-t-shirt-game-hack In PDF document text
    • http://library.futureuniversity.com/repository/hack-system-for-roblox_GM431946152.pdfIn PDF document text
    • http://library.futureuniversity.com/repository/free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://library.futureuniversity.com/repository/free-coin-master-cards_GM406889139.pdfIn PDF document text
    • http://library.futureuniversity.com/repository/coin-master-free-rare-cards_GM406889139.pdfIn PDF document text
    • http://library.futureuniversity.com/repository/how-to-get-free-unlimited-coins-in-coin-master_GM406889139.pdfIn PDF document text
    • http://library.futureuniversity.com/repository/como-hackear-roblox-para-tener-robux-2021_GM431946152.pdfIn PDF document text
    • http://library.futureuniversity.com/repository/hack-to-send-gold-cards-on-coin-master_GM406889139.pdfIn PDF document text
    • http://library.futureuniversity.com/repository/how-to-get-the-green-dragon-wings-roblox-for-free_GM431946152.pdfIn PDF document text
    • http://library.futureuniversity.com/repository/how-to-hack-roblox-2021_GM431946152.pdfIn PDF document text
    • http://library.futureuniversity.com/repository/roblox-pastebin-free-robux_GM431946152.pdfIn PDF document text
    • http://library.futureuniversity.com/repository/how-to-get-free-robux-easy-2021-no-human-verification_GM431946152.pdfIn PDF document text
    • http://library.futureuniversity.com/repository/coin-master-daily_GM406889139.pdfIn PDF document text
    • http://library.futureuniversity.com/repository/roblox-free-black-suit_GM431946152.pdfIn PDF document text
    • http://library.futureuniversity.com/repository/dantdm-roblox-hacked_GM431946152.pdfIn PDF document text
    • http://library.futureuniversity.com/repository/rblx-gg-free-robux_GM431946152.pdfIn PDF document text
    • http://library.futureuniversity.com/repository/minecraft-pe-mod-menu_GM479516143.pdfIn PDF document text
    • http://library.futureuniversity.com/repository/roblox-arcane-adventures-cheats_GM431946152.pdfIn PDF document text
    • http://library.futureuniversity.com/repository/coin-master-free-spins-uk_GM406889139.pdfIn PDF document text
    • http://library.futureuniversity.com/repository/coin-master-links-2021_GM406889139.pdfIn PDF document text
    • http://library.futureuniversity.com/repository/rbx-place-free-robux_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000322c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x322C 21572 bytes
SHA-256: 63aee11b750d6fd3601e8c2137106c9fa0314b163b3a4f68aa8d78920062cafa
font_01_sfnt_off000061ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x61AB 19220 bytes
SHA-256: 0f2ce9deee3d624f69c9f13fb1cf30fb94f0fc3706ed789f68ae14ae58da2e2b

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