Malicious PDF — malware analysis report

Static analysis result for SHA-256 48b5b831069fc48b…

MALICIOUS

PDF

35.3 KB Created: 2021-06-30 01:35:37 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-24
MD5: b9af9bfa3ad4935a6a413c163531575f SHA-1: 8586231a09b59461e86c7ab91f43a3ee363e9d37 SHA-256: 48b5b831069fc48b11e2f4cf6dc7440aa0351b79297492812aa0cfb7d02421e9
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains embedded links that lead to a known malicious redirector, masquerading as a 'game hack' or 'free generator' lure. The document body text and heuristic firings confirm the intent to trick users into visiting these malicious URLs, likely for further exploitation or malware delivery. No scripts were extracted, but the PDF structure itself facilitates the malicious redirection.

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/how-to-fix-elysian-roblox-hack-crash-game-hack In PDF document text
    • http://elibrary.smknesbu.sch.id/repository/website-on-how-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://elibrary.smknesbu.sch.id/repository/free-spins-on-coin-master-app_GM406889139.pdfIn PDF document text
    • http://elibrary.smknesbu.sch.id/repository/roblox-kids-free-robux_GM431946152.pdfIn PDF document text
    • http://elibrary.smknesbu.sch.id/repository/pastebin-robux-hack-2021_GM431946152.pdfIn PDF document text
    • http://elibrary.smknesbu.sch.id/repository/easy-way-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://elibrary.smknesbu.sch.id/repository/hack-para-obtener-robux-2021_GM431946152.pdfIn PDF document text
    • http://elibrary.smknesbu.sch.id/repository/best-free-roblox-outfits_GM431946152.pdfIn PDF document text
    • http://elibrary.smknesbu.sch.id/repository/roblox-com-free_GM431946152.pdfIn PDF document text
    • http://elibrary.smknesbu.sch.id/repository/roblox-free-robux-com_GM431946152.pdfIn PDF document text
    • http://elibrary.smknesbu.sch.id/repository/coin-master-card-hack_GM406889139.pdfIn PDF document text
    • http://elibrary.smknesbu.sch.id/repository/download-dimond-roblox-hacks_GM431946152.pdfIn PDF document text
    • http://elibrary.smknesbu.sch.id/repository/how-to-cheat-in-vampire-hunters-roblox_GM431946152.pdfIn PDF document text
    • http://elibrary.smknesbu.sch.id/repository/how-to-get-more-free-coins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://elibrary.smknesbu.sch.id/repository/hacking-money-in-vehicle-sim-roblox_GM431946152.pdfIn PDF document text
    • http://elibrary.smknesbu.sch.id/repository/get-free-robux-400_GM431946152.pdfIn PDF document text
    • http://elibrary.smknesbu.sch.id/repository/john-doe-roblox-hacker-in-real-life_GM431946152.pdfIn PDF document text
    • http://elibrary.smknesbu.sch.id/repository/how-to-hack-roblox-games_GM431946152.pdfIn PDF document text
    • http://elibrary.smknesbu.sch.id/repository/counter-blox-roblox-offensive-hack-skins_GM431946152.pdfIn PDF document text
    • http://elibrary.smknesbu.sch.id/repository/robux-only_GM431946152.pdfIn PDF document text
    • http://elibrary.smknesbu.sch.id/repository/coin-master-hack-extension_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_002_off00003018.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x3018 23112 bytes
SHA-256: 6070c9c22cff70faff40d3fe23ce211ef1c3f7e5abf909b58d75dd71a14eb3d4
font_01_sfnt_off0000641d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x641D 19448 bytes
SHA-256: 575465e56814a48468b2f8d0cf47269102a1ea3a95ddf12c0beb3df0375c06db

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