Malicious PDF — malware analysis report

Static analysis result for SHA-256 26f21c7a5fdfac2e…

MALICIOUS

PDF

35.0 KB Created: 2021-07-06 11:50:37 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 381a8fe41384d769c02ea570b3b3a9ef SHA-1: 6cd7bee395d1006214eda0f5914cfcdbbff51000 SHA-256: 26f21c7a5fdfac2eabf4380c5f9dbb4ed0dd81024a972f6431be4457f0836e38
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links to known malicious redirectors, specifically advertising 'Coin Master Hack Link 2021' and other game-related cheats. The presence of these links and the ML classifier's high confidence score indicate a malicious intent to redirect users to potentially harmful websites. No scripts were extracted, but the document's structure and embedded URLs strongly suggest a lure for further malicious activity.

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-hack-link-2021-game-hack In PDF document text
    • http://opac.akafarma-aceh.ac.id/repository/a-discord-server-that-gives-free-robux_GM431946152.pdfIn PDF document text
    • http://opac.akafarma-aceh.ac.id/repository/how-to-get-free-stuff-roblox-2021_GM431946152.pdfIn PDF document text
    • http://opac.akafarma-aceh.ac.id/repository/easy-robux_GM431946152.pdfIn PDF document text
    • http://opac.akafarma-aceh.ac.id/repository/roblox-hack-init_GM431946152.pdfIn PDF document text
    • http://opac.akafarma-aceh.ac.id/repository/minecraft-pe-015-0-apk-free-download_GM479516143.pdfIn PDF document text
    • http://opac.akafarma-aceh.ac.id/repository/minecraft-packs-free_GM479516143.pdfIn PDF document text
    • http://opac.akafarma-aceh.ac.id/repository/hack-para-texting-simulator-roblox_GM431946152.pdfIn PDF document text
    • http://opac.akafarma-aceh.ac.id/repository/how-to-become-a-hacker-in-roblox_GM431946152.pdfIn PDF document text
    • http://opac.akafarma-aceh.ac.id/repository/www-claim-gg-to-earn-free-robux_GM431946152.pdfIn PDF document text
    • http://opac.akafarma-aceh.ac.id/repository/minecraft-windows-10-code-free_GM479516143.pdfIn PDF document text
    • http://opac.akafarma-aceh.ac.id/repository/free-roblox-exploits_GM431946152.pdfIn PDF document text
    • http://opac.akafarma-aceh.ac.id/repository/claimrbx-free-robux_GM431946152.pdfIn PDF document text
    • http://opac.akafarma-aceh.ac.id/repository/roblox-promo-code-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://opac.akafarma-aceh.ac.id/repository/hacks-to-get-money-on-roblox_GM431946152.pdfIn PDF document text
    • http://opac.akafarma-aceh.ac.id/repository/free-roblox-avatar-clothes_GM431946152.pdfIn PDF document text
    • http://opac.akafarma-aceh.ac.id/repository/daily-free-spins_GM406889139.pdfIn PDF document text
    • http://opac.akafarma-aceh.ac.id/repository/free-robux-no-surveys-no-human-verifacation-2021-2021_GM431946152.pdfIn PDF document text
    • http://opac.akafarma-aceh.ac.id/repository/best-free-robux-sites_GM431946152.pdfIn PDF document text
    • http://opac.akafarma-aceh.ac.id/repository/free-spins-coins-coin-master_GM406889139.pdfIn PDF document text
    • http://opac.akafarma-aceh.ac.id/repository/tiktok-free-followers-mod-apk_GM835599320.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_002_off00003163.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x3163 23204 bytes
SHA-256: 128d5f461a157ac0507b398c38aebbcc21e45ecd20c8396eb652a349c922cd23
font_01_sfnt_off0000658a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x658A 18408 bytes
SHA-256: d5b6f006b4d249f2612d7ba491022a3c01f93cd67d090e1b281bc0b120cf534f

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