Malicious PDF — malware analysis report

Static analysis result for SHA-256 6242f2973641833b…

MALICIOUS

PDF

33.8 KB Created: 2021-07-09 04:18:23 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 13d4eb1af7361f1820c39b69ca4555f9 SHA-1: 249b9e883e0c6b15a5fe6db5b9877f2a116a52d2 SHA-256: 6242f2973641833b18464da51f8c6193d1676f3928221b3352be44ca5011cf38
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains links to malicious redirectors and further malicious PDFs, masquerading as game hacks and generators. The primary malicious URL identified is http://netcdn.tw/app/431946152/roblox-robux-hack-game-hack, which is associated with known malicious infrastructure. The document body and heuristics indicate a lure for free in-game currency or hacks, leading 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/431946152/roblox-robux-hack-game-hack In PDF document text
    • http://ycstamping.com.tw/image/data/files/coin-master-free-spinv1-0apkpure-com-apk_GM406889139.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/coin-master-twitter-free-spins_GM406889139.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/how-to-get-more-robux-for-free_GM431946152.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/is-minecraft-java-edition-free_GM479516143.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/free-coin-master-cards_GM406889139.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/free-generator_GM431946152.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/como-hackear-roblox-apk-mediafire_GM431946152.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/free-robux-app-no-password_GM431946152.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/roblox-hack-ios_GM431946152.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/roblox-rape-hack_GM431946152.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/free-robux-only-username_GM431946152.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/free-rthro-roblox_GM431946152.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/free-minecraft-website_GM479516143.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/how-to-hack-a-minecraft-account_GM479516143.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/minecraft-auto-miner-hack_GM479516143.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/cm-free-spins-and-coins_GM406889139.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/free-robuxdill_GM431946152.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/free-robux-hack-no-survey-or-download_GM431946152.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/how-to-wins-free-robux_GM431946152.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/roblox-apocalypse-rising-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_off00002f43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2F43 21904 bytes
SHA-256: b9db37bd418541fd3f4edb38d864abe892a7be929406f5eef88807c765d13a78
font_01_sfnt_off00005f92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5F92 18796 bytes
SHA-256: ac85a7f36e8d2c6b778aa8e0527eba638abc788d16e2325ecdb460050b0ba6ed

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