Malicious PDF — malware analysis report

Static analysis result for SHA-256 9afb06d92fd35b61…

MALICIOUS

PDF

46.1 KB Created: 2021-06-08 23:30:14 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-31
MD5: cb778586e84539f96ace9e67d2c520ac SHA-1: 3f6dbbfbd93cea058b3aeeb105acf203c68471ce SHA-256: 9afb06d92fd35b61f6c50c3fef9bb97de63ef3f6ea09b79b90be51d4fb19487a
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to known malicious redirectors, including one that masquerades as a 'free Robux hack'. The document body and embedded links strongly suggest a lure for users seeking in-game currency or cheats, leading them to potentially malicious sites. No scripts were extracted, but the presence of malicious links and the lure pattern indicate a phishing or scam attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9864

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 https://netcdn.tw/app/431946152/free-robux-hack-2021-ios-game-hack In PDF document text
    • http://library.stieyapan.ac.id//repository/minecraft-bedrock-hacks_GM479516143.pdfIn PDF document text
    • http://library.stieyapan.ac.id//repository/roblox-apocalypse-rising-hack_GM431946152.pdfIn PDF document text
    • http://library.stieyapan.ac.id//repository/coin-master-free-spin-and-coin-link-2021-today_GM406889139.pdfIn PDF document text
    • http://library.stieyapan.ac.id/repository/free-coins-2021-coin-master-link_GM406889139.pdfIn PDF document text
    • http://library.stieyapan.ac.id/repository/coin-master-2021-free-spins_GM406889139.pdfIn PDF document text
    • http://library.stieyapan.ac.id/repository/can-pokemon-go-free-remote-raid-pass_GM1094591345.pdfIn PDF document text
    • http://library.stieyapan.ac.id//repository/robux-generator-no-human-verification_GM431946152.pdfIn PDF document text
    • http://library.stieyapan.ac.id/repository/free-robux-hack-download-no-survey_GM431946152.pdfIn PDF document text
    • http://library.stieyapan.ac.id//repository/coin-master-free-daily-spins-link_GM406889139.pdfIn PDF document text
    • http://library.stieyapan.ac.id/repository/games-like-coin-master_GM406889139.pdfIn PDF document text
    • http://library.stieyapan.ac.id//repository/coin-master-free-spin-2912-2021_GM406889139.pdfIn PDF document text
    • http://library.stieyapan.ac.id//repository/robux-gift-card-free_GM431946152.pdfIn PDF document text
    • http://library.stieyapan.ac.id//repository/coin-master-free-spin-and-coins-links-2021_GM406889139.pdfIn PDF document text
    • http://library.stieyapan.ac.id//repository/roblox-hack-me-robux_GM431946152.pdfIn PDF document text
    • http://library.stieyapan.ac.id//repository/how-to-make-a-free-minecraft-account_GM479516143.pdfIn PDF document text
    • http://library.stieyapan.ac.id/repository/free-things-on-roblox_GM431946152.pdfIn PDF document text
    • http://library.stieyapan.ac.id//repository/coin-master-hack-cheat-generator-coins-and-spins-unlimited_GM406889139.pdfIn PDF document text
    • http://library.stieyapan.ac.id//repository/can-you-get-free-robux-on-roblox_GM431946152.pdfIn PDF document text
    • http://library.stieyapan.ac.id/repository/minecraft-windows-10-code-free_GM479516143.pdfIn PDF document text
    • http://library.stieyapan.ac.id/repository/i-didnt-get-my-free-spins-in-coin-master_GM406889139.pdfIn PDF document text
    • https://www.bandicam.comIn 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_004_off00005226.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5226 27448 bytes
SHA-256: ab4acf54a0062582801861f66c0cafc8ca46fbf0063b173929bc0dfde108defd
font_01_sfnt_off0000901c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x901C 18816 bytes
SHA-256: 8fa96e40c1a8de4f95fb522fac2843c838e788604fe96914c26339c97bce4321

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