Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c64089fdf37bed9…

MALICIOUS

PDF

35.1 KB Created: 2021-07-09 17:37:26 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-26
MD5: be6eb6670803e4a71f5693a427ddbc3b SHA-1: 7bb6f5d5f055b77d201c023335a2088b940c9290 SHA-256: 6c64089fdf37bed923a9c3f957734ac652bf01764d2fe8547f47d0ab6bc784dd
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links that redirect to malicious infrastructure, specifically targeting users interested in game hacks and free currency. The primary lure URL is http://netcdn.tw/app/431946152/how-do-you-hack-roblox-game-hack. While no scripts were extracted, the document's structure and embedded URLs strongly indicate a phishing or scam attempt, likely delivered as a spearphishing attachment.

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/431946152/how-do-you-hack-roblox-game-hack In PDF document text
    • http://ycstamping.com.tw/image/data/files/how-to-play-minecraft-online-for-free_GM479516143.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/easy-robux-today-hack-2021_GM431946152.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/free-robux-websites-no-human-verification_GM431946152.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/free-robux-no-verification-needed_GM431946152.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/master-coin-free-spin-daily_GM406889139.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/how-to-hack-someones-roblox-account_GM431946152.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/roblox-building-games-free_GM431946152.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/free-games-roblox-games_GM431946152.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/how-to-hack-theme-park-tycoon-2-roblox_GM431946152.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/how-to-get-free-robux-for-free_GM431946152.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/roblox-mad-city-cheat-commands_GM431946152.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/counter-blox-roblox-offensive-hacks-wall-hacks_GM431946152.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/we-hack-robux_GM431946152.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/free-100-robux-code_GM431946152.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/clockingshades-roblox-hacker_GM431946152.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/pokemon-go-free-raid-passes-2021_GM1094591345.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/how-to-get-remotes-roblox-hack_GM431946152.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/free-robux-for-taylorkittylover1_GM431946152.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/roblox-piano-monody-hack-delay_GM431946152.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/roblox-dragon-ball-hack_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_off00003139.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3139 22452 bytes
SHA-256: 6539427a31a63c65cc51c87e95cddb942721272de5e45bc4e27fddd32e6b3df9
font_01_sfnt_off00006349.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6349 19292 bytes
SHA-256: 9995eaa591a4ae7360538d13bc69f9b48a4c6000d4d0fc373ba7f602d67ad74d

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