Malicious PDF — malware analysis report

Static analysis result for SHA-256 a68aad4c99733fcf…

MALICIOUS

PDF

33.9 KB Created: 2021-07-04 10:20:22 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 34d31bbd7b0b8c36524b66ab4c2c68f6 SHA-1: 188045edb082a72177fe215991a452610f4904a0 SHA-256: a68aad4c99733fcfade5813a39b5ec8c9003cb4da7c7f1646d609ceab98150b1
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links, including one pointing to a known malicious redirector infrastructure at http://netcdn.tw/app/406889139/coin-master-daily-free-coins-link-game-hack. The document body and extracted URLs suggest a lure for game-related cheats or currency, a common tactic for phishing or malware distribution. No scripts were extracted, but the presence of malicious links indicates a high likelihood of leading the user to a malicious site.

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-daily-free-coins-link-game-hack In PDF document text
    • http://lib.fekon.untad.ac.id/repository/free-robux-guuudinfo_GM431946152.pdfIn PDF document text
    • http://lib.fekon.untad.ac.id/repository/how-to-get-free-robux-without-generator_GM431946152.pdfIn PDF document text
    • http://lib.fekon.untad.ac.id/repository/free-spins-coins-coin-master_GM406889139.pdfIn PDF document text
    • http://lib.fekon.untad.ac.id/repository/roblox-com-r_GM431946152.pdfIn PDF document text
    • http://lib.fekon.untad.ac.id/repository/free-links-to-coin-master_GM406889139.pdfIn PDF document text
    • http://lib.fekon.untad.ac.id/repository/arsenal-fly-hack-roblox_GM431946152.pdfIn PDF document text
    • http://lib.fekon.untad.ac.id/repository/free-robux-we-are-devs_GM431946152.pdfIn PDF document text
    • http://lib.fekon.untad.ac.id/repository/100-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://lib.fekon.untad.ac.id/repository/roblox-free-robux-easy_GM431946152.pdfIn PDF document text
    • http://lib.fekon.untad.ac.id/repository/how-to-get-all-catalog-free-roblox_GM431946152.pdfIn PDF document text
    • http://lib.fekon.untad.ac.id/repository/how-to-get-free-backpack-in-roblox_GM431946152.pdfIn PDF document text
    • http://lib.fekon.untad.ac.id/repository/coin-master-free-link-facebook_GM406889139.pdfIn PDF document text
    • http://lib.fekon.untad.ac.id/repository/cheated-roblox-gun_GM431946152.pdfIn PDF document text
    • http://lib.fekon.untad.ac.id/repository/roblox-hack-scripts-2021_GM431946152.pdfIn PDF document text
    • http://lib.fekon.untad.ac.id/repository/noxplayer-speed-hack-roblox_GM431946152.pdfIn PDF document text
    • http://lib.fekon.untad.ac.id/repository/how-to-hack-in-roblox-easy_GM431946152.pdfIn PDF document text
    • http://lib.fekon.untad.ac.id/repository/roblox-cheat-codes_GM431946152.pdfIn PDF document text
    • http://lib.fekon.untad.ac.id/repository/coin-master-hack-apk-with-fb-login_GM406889139.pdfIn PDF document text
    • http://lib.fekon.untad.ac.id/repository/roblox-hack-apk-mod_GM431946152.pdfIn PDF document text
    • http://lib.fekon.untad.ac.id/repository/twitter-coin-master-free-spins_GM406889139.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_off00002f92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2F92 22196 bytes
SHA-256: 8e017cf8dc0f668a7edc948654003f2126808485372ec093fc149eb4de39fce8
font_01_sfnt_off000060cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x60CB 18588 bytes
SHA-256: 602990f58edd0fffaccb1593f10b6a26f20777d4b3942483c7e8a81716f82fb0

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