Malicious PDF — malware analysis report

Static analysis result for SHA-256 f748c989cbc4059a…

MALICIOUS

PDF

34.1 KB Created: 2021-07-03 18:35:01 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 528cdab0c7142d11a6cc4c346dc773d6 SHA-1: 1efc26f33aff96d54e208cf5927a284b884b7101 SHA-256: f748c989cbc4059ac3ab3920d4fbfa31fee0ac2baae29c97d96cc242fc91c21e
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple embedded URLs and a call-to-action button, all designed to lure the user into clicking links related to free in-game currency or hacks. The primary URL, http://netcdn.tw/app/431946152/free-2021-robux-game-hack, is identified as a malicious redirector. This suggests the document's purpose is to lead users to potentially malicious websites that could host further exploits, malware, or phishing content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9824

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.tw/app/431946152/free-2021-robux-game-hack In PDF document text
    • http://perpus-untagsby.web.id/library-untagsby.web.id/repository/free-robux-codes-no-human-verification_GM431946152.pdfIn PDF document text
    • http://perpus-untagsby.web.id/library-untagsby.web.id/repository/free-robux-python-2021_GM431946152.pdfIn PDF document text
    • http://perpus-untagsby.web.id/library-untagsby.web.id/repository/everything-free-in-roblox_GM431946152.pdfIn PDF document text
    • http://perpus-untagsby.web.id/library-untagsby.web.id/repository/how-to-hack-roblox-accounts_GM431946152.pdfIn PDF document text
    • http://perpus-untagsby.web.id/library-untagsby.web.id/repository/how-to-hack-roblox-accounts-on-mobile_GM431946152.pdfIn PDF document text
    • http://perpus-untagsby.web.id/library-untagsby.web.id/repository/free-robux-offers_GM431946152.pdfIn PDF document text
    • http://perpus-untagsby.web.id/library-untagsby.web.id/repository/gideon-the-streets-roblox-hack_GM431946152.pdfIn PDF document text
    • http://perpus-untagsby.web.id/library-untagsby.web.id/repository/how-to-hack-minecraft_GM479516143.pdfIn PDF document text
    • http://perpus-untagsby.web.id/library-untagsby.web.id/repository/free-robux-today-codes_GM431946152.pdfIn PDF document text
    • http://perpus-untagsby.web.id/library-untagsby.web.id/repository/coin-master-2021-free-spins-link-today_GM406889139.pdfIn PDF document text
    • http://perpus-untagsby.web.id/library-untagsby.web.id/repository/free-robux-without-downloading-anything_GM431946152.pdfIn PDF document text
    • http://perpus-untagsby.web.id/library-untagsby.web.id/repository/free-robux-no-human-verification-and-no-survey_GM431946152.pdfIn PDF document text
    • http://perpus-untagsby.web.id/library-untagsby.web.id/repository/free-spins-and-coins-coin-master-facebook_GM406889139.pdfIn PDF document text
    • http://perpus-untagsby.web.id/library-untagsby.web.id/repository/roblox-halloween-outfits-free_GM431946152.pdfIn PDF document text
    • http://perpus-untagsby.web.id/library-untagsby.web.id/repository/roblox-how-to-be-copletely-white-free_GM431946152.pdfIn PDF document text
    • http://perpus-untagsby.web.id/library-untagsby.web.id/repository/hacked-roblox-accounts-list_GM431946152.pdfIn PDF document text
    • http://perpus-untagsby.web.id/library-untagsby.web.id/repository/how-to-get-free-robux-in-roblox-by-inspect-2021_GM431946152.pdfIn PDF document text
    • http://perpus-untagsby.web.id/library-untagsby.web.id/repository/is-there-any-tricks-or-working-hacks-for-coin-master_GM406889139.pdfIn PDF document text
    • http://perpus-untagsby.web.id/library-untagsby.web.id/repository/hack-roblox-kewlaid_GM431946152.pdfIn PDF document text
    • http://perpus-untagsby.web.id/library-untagsby.web.id/repository/roblox-snow-shoveling-simulator-free-santa-bag-infinity_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_001_off00002cad.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x2CAD 23020 bytes
SHA-256: 2aa5d0b4e844feee88c11f7fd4b65c62755394df18e8c6592030192be78c4b4d
font_01_sfnt_off00006050.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6050 19116 bytes
SHA-256: af14d1fa5b4f919e14fbfd2207fee29f86c7e1258ad11836ead4aea48baef512

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