Malicious PDF — malware analysis report

Static analysis result for SHA-256 d9273860490a36a6…

MALICIOUS

PDF

34.2 KB Created: 2021-07-04 08:22:56 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 0ebba8b6fa56efa45812adf879b6457d SHA-1: dd9f03f10bd38087985aa2bdc26e593b3a3acbc1 SHA-256: d9273860490a36a6c5aa711d083099cc92e74f9037385c9b210a7fb0d8add507
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links to known malicious redirectors and websites offering game hacks and free in-game currency, indicating a social engineering lure. The primary malicious URL identified is http://netcdn.tw/app/406889139/coin-master-twitter-game-hack. While no scripts were explicitly extracted, the PDF structure and embedded links strongly suggest a malicious intent to redirect users to potentially harmful content.

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-twitter-game-hack In PDF document text
    • http://bob-reid-music.com/uploads/files/files/free-private-minecraft-server_GM479516143.pdfIn PDF document text
    • http://bob-reid-music.com/uploads/files/files/coin-master-free-spins-2021-app_GM406889139.pdfIn PDF document text
    • http://bob-reid-music.com/uploads/files/files/roblox-hack-tool_GM431946152.pdfIn PDF document text
    • http://bob-reid-music.com/uploads/files/files/how-to-get-free-robux-without-any-verification_GM431946152.pdfIn PDF document text
    • http://bob-reid-music.com/uploads/files/files/earn-rbx_GM431946152.pdfIn PDF document text
    • http://bob-reid-music.com/uploads/files/files/coin-master-cheats-2021_GM406889139.pdfIn PDF document text
    • http://bob-reid-music.com/uploads/files/files/free-clothing-on-roblox_GM431946152.pdfIn PDF document text
    • http://bob-reid-music.com/uploads/files/files/free-robux-script_GM431946152.pdfIn PDF document text
    • http://bob-reid-music.com/uploads/files/files/minecraft-noob-vs-pro-vs-hacker-vs-god_GM479516143.pdfIn PDF document text
    • http://bob-reid-music.com/uploads/files/files/free-minecraft-hosting_GM479516143.pdfIn PDF document text
    • http://bob-reid-music.com/uploads/files/files/dantdm-com-free-roblox-accounts_GM431946152.pdfIn PDF document text
    • http://bob-reid-music.com/uploads/files/files/how-to-get-free-robux-2021-no-hack_GM431946152.pdfIn PDF document text
    • http://bob-reid-music.com/uploads/files/files/10000-robux-free_GM431946152.pdfIn PDF document text
    • http://bob-reid-music.com/uploads/files/files/free-spins-coin-master-2021-app_GM406889139.pdfIn PDF document text
    • http://bob-reid-music.com/uploads/files/files/coin-master-free-spins-link-may-2021_GM406889139.pdfIn PDF document text
    • http://bob-reid-music.com/uploads/files/files/free-robux-gift-card-codes_GM431946152.pdfIn PDF document text
    • http://bob-reid-music.com/uploads/files/files/coin-master-free-spins-april-2021_GM406889139.pdfIn PDF document text
    • http://bob-reid-music.com/uploads/files/files/how-to-create-a-minecraft-server-for-free_GM479516143.pdfIn PDF document text
    • http://bob-reid-music.com/uploads/files/files/best-minecraft-hacked-client_GM479516143.pdfIn PDF document text
    • http://bob-reid-music.com/uploads/files/files/coin-master-free-spin-daily-link_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_off000030ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x30ED 22632 bytes
SHA-256: b374eeeb06009adecf5684256abda44643853752532e84971ff245b8905fce41
font_01_sfnt_off0000637b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x637B 17996 bytes
SHA-256: 08eb777ca11051aa95651408cba01fcc727dafbd0d85fbf60a16ac827606a4e9

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