Malicious PDF — malware analysis report

Static analysis result for SHA-256 1254c9b371b78579…

MALICIOUS

PDF

36.0 KB Created: 2021-07-06 11:52:35 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 19359455336991f1b563e6aa87b22964 SHA-1: a99696a1e740103d15bddefd30b6d42500ee369e SHA-256: 1254c9b371b78579e4eeb7c60956e6dfa268f11f1235ddd9a96d2cc32fbd9532
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains links to a known malicious redirector, masquerading as a game hack generator. The document body and embedded URLs promote free game currency and hacks, aiming to trick users into visiting malicious sites. While no scripts were explicitly extracted, the PDF structure and embedded URLs strongly suggest a phishing or social engineering attack vector.

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/406889139/coin-master-game-2021-free-spin-link-game-hack In PDF document text
    • http://elibrary.smknesbu.sch.id/repository/roblox-admin-hack_GM431946152.pdfIn PDF document text
    • http://elibrary.smknesbu.sch.id/repository/roblox-free-accounts-2021_GM431946152.pdfIn PDF document text
    • http://elibrary.smknesbu.sch.id/repository/roblox-free-necklace_GM431946152.pdfIn PDF document text
    • http://elibrary.smknesbu.sch.id/repository/how-to-get-free-robux-2021-easy_GM431946152.pdfIn PDF document text
    • http://elibrary.smknesbu.sch.id/repository/hackear-roblox-para-android_GM431946152.pdfIn PDF document text
    • http://elibrary.smknesbu.sch.id/repository/free-robux-without-downloading-anything-2021_GM431946152.pdfIn PDF document text
    • http://elibrary.smknesbu.sch.id/repository/roblox-hack-generator_GM431946152.pdfIn PDF document text
    • http://elibrary.smknesbu.sch.id/repository/minecraft-free-download-2021_GM479516143.pdfIn PDF document text
    • http://elibrary.smknesbu.sch.id/repository/how-to-hack-roblox-death-zone_GM431946152.pdfIn PDF document text
    • http://elibrary.smknesbu.sch.id/repository/free-30-tiktok-likes_GM835599320.pdfIn PDF document text
    • http://elibrary.smknesbu.sch.id/repository/free-account-roblox-generator-download_GM431946152.pdfIn PDF document text
    • http://elibrary.smknesbu.sch.id/repository/free-robux-giver-2021_GM431946152.pdfIn PDF document text
    • http://elibrary.smknesbu.sch.id/repository/free-robux-generator-no-robot-verification_GM431946152.pdfIn PDF document text
    • http://elibrary.smknesbu.sch.id/repository/counter-blox-roblox-offensive-hack-money_GM431946152.pdfIn PDF document text
    • http://elibrary.smknesbu.sch.id/repository/hack-team-roblox_GM431946152.pdfIn PDF document text
    • http://elibrary.smknesbu.sch.id/repository/roblox-anti-cheat-speed_GM431946152.pdfIn PDF document text
    • http://elibrary.smknesbu.sch.id/repository/free-spins-coin-master-unlimited_GM406889139.pdfIn PDF document text
    • http://elibrary.smknesbu.sch.id/repository/roblox-hack-robux-android-1_GM431946152.pdfIn PDF document text
    • http://elibrary.smknesbu.sch.id/repository/coin-master-free-100-spin-link_GM406889139.pdfIn PDF document text
    • http://elibrary.smknesbu.sch.id/repository/when-your-roblox-girlfriend-cheats-on-you_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_002_off0000331a.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x331A 23332 bytes
SHA-256: 126e1f99cf4c0449a3249504fbd72c1fa37148c3f6f458c3dbca946abc20de9b
font_01_sfnt_off000067fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x67FD 19004 bytes
SHA-256: 0380ea631ae9459a709a33ae7c12e24ce61e57c36bba07f41eb8bd34d02fd060

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