Malicious PDF — malware analysis report

Static analysis result for SHA-256 55d72ed2b482dac6…

MALICIOUS

PDF

45.2 KB Created: 2021-06-08 19:02:24 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-25
MD5: a88b14a4b90ba500f946a7cc0a4452e0 SHA-1: 2517b71306245357d3580736cd14a926544fed5f SHA-256: 55d72ed2b482dac6bc8a49fad84224974dde63706d0089ec7dd52dc68b73696f
122 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF document was flagged as malicious by an ML classifier. It uses brand-impersonation credential phishing. The file routes users through malicious redirector infrastructure and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9864

Heuristics 5

  • PDF links to a 'free generator / game hack' redirector high 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.
  • Brand-impersonation credential phishing lure high SE_BRAND_CREDENTIAL_PHISH
    Document impersonates a well-known consumer brand and uses account-security / verification language ('unusual activity', 'account on hold', 'verify your account') to steer the reader to a credential-harvesting link. Corroborated by: call-to-action link host does not match the impersonated brand: https://netcdn.tw/app/431946152/free-robux-no-playing-games-or-human-verification-game-hack.
  • 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
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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-no-playing-games-or-human-verification-game-hack PDF link annotation
    • http://pia2000.net/images/coin-master-ad_GM406889139.pdfIn PDF document text
    • http://pia2000.net/images/can-you-actually-get-free-robux_GM431946152.pdfIn PDF document text
    • http://pia2000.net/images/free-robux-net_GM431946152.pdfIn PDF document text
    • http://pia2000.net/images/roblox-com-free-robux_GM431946152.pdfIn PDF document text
    • http://pia2000.net/images/roblox-lost-game-hack-script_GM431946152.pdfIn PDF document text
    • http://pia2000.net/images/free-robux-com-no-verification_GM431946152.pdfIn PDF document text
    • http://pia2000.net/images/coin-master-free-online_GM406889139.pdfIn PDF document text
    • http://pia2000.net/images/get-free-robux-no-verification_GM431946152.pdfIn PDF document text
    • http://pia2000.net/images/free-daily-coin-master-coins_GM406889139.pdfIn PDF document text
    • http://pia2000.net/images/cheat-monkey-roblox_GM431946152.pdfIn PDF document text
    • http://pia2000.net/images/coin-master-links-for-today_GM406889139.pdfIn PDF document text
    • http://pia2000.net/images/how-to-get-free-robux-easy-no-download_GM431946152.pdfIn PDF document text
    • http://pia2000.net/images/free-pe_GM479516143.pdfIn PDF document text
    • http://pia2000.net/images/roblox-bloxburg-hack_GM431946152.pdfIn PDF document text
    • http://pia2000.net/images/coin-master-hack-spins-free_GM406889139.pdfIn PDF document text
    • http://pia2000.net/images/coin-master-game-hunters-club_GM406889139.pdfIn PDF document text
    • http://pia2000.net/images/roblox-ftw_GM431946152.pdfIn PDF document text
    • http://pia2000.net/images/free-robux-images_GM431946152.pdfIn PDF document text
    • http://pia2000.net/images/how-to-hack-coin-master-game-2021_GM406889139.pdfIn PDF document text
    • http://pia2000.net/images/50-free-tiktok-likes_GM835599320.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_004_off000051c0.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x51C0 25112 bytes
SHA-256: 2f04bdce5dffa18b057571cf94b28b45ea5a7521d0fcdb934d29d86a6b6f216b
font_01_sfnt_off00008a5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8A5F 19556 bytes
SHA-256: aa60378cca5dfd693c237a964029973faa03e29f45aafa4039c4618ee31ffcaa

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