Malicious PDF — malware analysis report

Static analysis result for SHA-256 3617c4fadc2cf8a5…

MALICIOUS

PDF

33.3 KB Created: 2021-07-07 17:11:24 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 1280444269572c299bfd3236c8bdadc1 SHA-1: 83e28c7ba85509d33a8ab2781125ca8d6a1c2a6f SHA-256: 3617c4fadc2cf8a5823ae3a4d01490ac246f30c80e3d886502ac021f1ae4ec28
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document contains multiple links designed to lure users into clicking on what appears to be a game hack or free currency generator. The primary link, http://netcdn.tw/app/406889139/free-coins-on-coin-master-game-hack, is flagged as a known malicious redirector. The document body and embedded URLs suggest a phishing or scam attempt related to popular online games.

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/free-coins-on-coin-master-game-hack In PDF document text
    • http://samavetpharm.com/userfiles/files/free-minecraft-accounts-reddit_GM479516143.pdfIn PDF document text
    • http://samavetpharm.com/userfiles/files/real-robux-codes_GM431946152.pdfIn PDF document text
    • http://samavetpharm.com/userfiles/files/get-free-robux-without-human-verification_GM431946152.pdfIn PDF document text
    • http://samavetpharm.com/userfiles/files/promo-codes-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://samavetpharm.com/userfiles/files/robux-free-promo-codes_GM431946152.pdfIn PDF document text
    • http://samavetpharm.com/userfiles/files/coin-master-free-spins-and-coins-2021_GM406889139.pdfIn PDF document text
    • http://samavetpharm.com/userfiles/files/roblox-com-r_GM431946152.pdfIn PDF document text
    • http://samavetpharm.com/userfiles/files/is-minecraft-free-on-nintendo-switch_GM479516143.pdfIn PDF document text
    • http://samavetpharm.com/userfiles/files/coin-master-spin-hack-no-verification_GM406889139.pdfIn PDF document text
    • http://samavetpharm.com/userfiles/files/get-free-robux-without-doing-anything_GM431946152.pdfIn PDF document text
    • http://samavetpharm.com/userfiles/files/coin-master-hack-without-verification-for-iphone_GM406889139.pdfIn PDF document text
    • http://samavetpharm.com/userfiles/files/coin-master-hack-without-verify_GM406889139.pdfIn PDF document text
    • http://samavetpharm.com/userfiles/files/how-do-you-get-free-robux_GM431946152.pdfIn PDF document text
    • http://samavetpharm.com/userfiles/files/minecraft-for-free-games_GM479516143.pdfIn PDF document text
    • http://samavetpharm.com/userfiles/files/hack-conteur-blox-roblox_GM431946152.pdfIn PDF document text
    • http://samavetpharm.com/userfiles/files/game-hunters-coin-master_GM406889139.pdfIn PDF document text
    • http://samavetpharm.com/userfiles/files/how-to-get-free-robux-not-a-scam_GM431946152.pdfIn PDF document text
    • http://samavetpharm.com/userfiles/files/roblox-hacks-multiplayer-game-hacks_GM431946152.pdfIn PDF document text
    • http://samavetpharm.com/userfiles/files/coin-master-gift-hack_GM406889139.pdfIn PDF document text
    • http://samavetpharm.com/userfiles/files/greasyfork-free-robux-script_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_off00002f5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2F5B 22184 bytes
SHA-256: 5ea3436e3b805e176d382ec29d240f269888b7b4457f18def0676df82b4b4713
font_01_sfnt_off0000605a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x605A 17996 bytes
SHA-256: 5a33b6bec0c3c7706623313049573f1ed29e81c6598642f68d7630bc30e8a689