Malicious PDF — malware analysis report

Static analysis result for SHA-256 86a528b1d3c02f55…

MALICIOUS

PDF

34.9 KB Created: 2021-07-03 14:23:17 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 07d713d786b3a2b535ddef0176251d26 SHA-1: 091e98859d59c0923acd7fd658966b1f6375e322 SHA-256: 86a528b1d3c02f55ab76849b6284c0b5503a3938488412bf22f001c81a0976d2
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links to a known malicious redirector, disguised as generators for free game currency or hacks. The document body explicitly mentions 'How To Make Free Robux' and includes the malicious URL, indicating a phishing or scam attempt. The presence of embedded URLs and the ML classifier's high confidence score support this assessment.

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.tw/app/431946152/how-to-make-free-robux-game-hack In PDF document text
    • http://lib.untad.ac.id/repository/account-in-roblox-free_GM431946152.pdfIn PDF document text
    • http://lib.untad.ac.id//repository/coin-master-hack-generator_GM406889139.pdfIn PDF document text
    • http://lib.untad.ac.id/repository/roblox-hack-cheat-tool-v12_GM431946152.pdfIn PDF document text
    • http://lib.untad.ac.id/repository/tshirt-adidas-for-free-roblox_GM431946152.pdfIn PDF document text
    • http://lib.untad.ac.id/repository/roblox-gainer-free-robux_GM431946152.pdfIn PDF document text
    • http://lib.untad.ac.id/repository/free-minecraft-java-edition_GM479516143.pdfIn PDF document text
    • http://lib.untad.ac.id//repository/coin-master-hacks-no-human-verification_GM406889139.pdfIn PDF document text
    • http://lib.untad.ac.id/repository/coin-master-free-bonus_GM406889139.pdfIn PDF document text
    • http://lib.untad.ac.id/repository/how-to-get-free-robux-no-hack-on-ipad_GM431946152.pdfIn PDF document text
    • http://lib.untad.ac.id/repository/simple-roblox-hack-hp_GM431946152.pdfIn PDF document text
    • http://lib.untad.ac.id/repository/the-rake-roblox-hack_GM431946152.pdfIn PDF document text
    • http://lib.untad.ac.id/repository/how-to-get-free-robux-using-inspect-2021_GM431946152.pdfIn PDF document text
    • http://lib.untad.ac.id/repository/download-roblox-clothes-free_GM431946152.pdfIn PDF document text
    • http://lib.untad.ac.id/repository/free-roblox-vpn_GM431946152.pdfIn PDF document text
    • http://lib.untad.ac.id/repository/murder-island-cheat-roblox_GM431946152.pdfIn PDF document text
    • http://lib.untad.ac.id/repository/how-to-hack-roblox-to-get-free-robux-easy_GM431946152.pdfIn PDF document text
    • http://lib.untad.ac.id/repository/unknown-cheats-roblox-speed-hack_GM431946152.pdfIn PDF document text
    • http://lib.untad.ac.id/repository/free-robux-without-human-verification-2021-or-survey_GM431946152.pdfIn PDF document text
    • http://lib.untad.ac.id/repository/exploit-20211-roblox-cheat-honeypot-users_GM431946152.pdfIn PDF document text
    • http://lib.untad.ac.id/repository/best-exploit-roblox-free_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
font_00_sfnt_off00003056.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3056 22708 bytes
SHA-256: 8947805ca57338f5340205d4aab0e331970280814b25db8a1ab08be1e49ede1a
font_01_sfnt_off000062f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x62F3 19244 bytes
SHA-256: 6b22af1083df9260d35a8428a36ac91eb4c7dbc1159f4e02fe88489ba0efcc00

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