Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1fc0d0a56052b98…

MALICIOUS

PDF

34.9 KB Created: 2021-07-03 12:05:19 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 4509fdacec6ec33895db1f88cd7e455b SHA-1: 91e9e3742c00b92f97ef087ce0667db1b14fdd5c SHA-256: a1fc0d0a56052b981cc6c8c67379eb152b05e6fbf2c3c4207ca4db6e2144dac5
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links that redirect to malicious infrastructure, specifically promoting game hacks and generators. The primary lure URL is http://netcdn.tw/app/431946152/roblox-adopt-me-hack-game-hack. While no scripts were explicitly extracted, the PDF structure and embedded URLs strongly suggest a social engineering tactic to trick users into visiting potentially harmful sites, likely leading to further malware downloads or phishing attempts.

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-adopt-me-hack-game-hack In PDF document text
    • http://en.gzyuquan.com/Public/upload/editorfiles/roblox-pics_GM431946152.pdfIn PDF document text
    • http://en.gzyuquan.com/Public/upload/editorfiles/minecraft-wurst-client_GM479516143.pdfIn PDF document text
    • http://en.gzyuquan.com/Public/upload/editorfiles/free-exploits-roblox-website_GM431946152.pdfIn PDF document text
    • http://en.gzyuquan.com/Public/upload/editorfiles/coin-master-daily-free-spins-link-today-blogspot_GM406889139.pdfIn PDF document text
    • http://en.gzyuquan.com/Public/upload/editorfiles/how-to-get-free-robuxs-on-computer_GM431946152.pdfIn PDF document text
    • http://en.gzyuquan.com/Public/upload/editorfiles/daily-free-spin-coin-master-link_GM406889139.pdfIn PDF document text
    • http://en.gzyuquan.com/Public/upload/editorfiles/free-generator-for-card-roblox-robux_GM431946152.pdfIn PDF document text
    • http://en.gzyuquan.com/Public/upload/editorfiles/hack-place-roblox-2021_GM431946152.pdfIn PDF document text
    • http://en.gzyuquan.com/Public/upload/editorfiles/generator-robux-free-download_GM431946152.pdfIn PDF document text
    • http://en.gzyuquan.com/Public/upload/editorfiles/cheat-engine-64-speed-hack-roblox_GM431946152.pdfIn PDF document text
    • http://en.gzyuquan.com/Public/upload/editorfiles/hackear-coin-master-sin-root_GM406889139.pdfIn PDF document text
    • http://en.gzyuquan.com/Public/upload/editorfiles/noob-vs-pro-vs-hacker-vs-god-minecraft_GM479516143.pdfIn PDF document text
    • http://en.gzyuquan.com/Public/upload/editorfiles/coin-master-free-spin-ml_GM406889139.pdfIn PDF document text
    • http://en.gzyuquan.com/Public/upload/editorfiles/how-to-get-your-account-back-on-roblox-if-hacked_GM431946152.pdfIn PDF document text
    • http://en.gzyuquan.com/Public/upload/editorfiles/free-roblox-executor_GM431946152.pdfIn PDF document text
    • http://en.gzyuquan.com/Public/upload/editorfiles/how-to-get-free-robux-generator-2021_GM431946152.pdfIn PDF document text
    • http://en.gzyuquan.com/Public/upload/editorfiles/coin-master-free-spins-and-coins-blogspot_GM406889139.pdfIn PDF document text
    • http://en.gzyuquan.com/Public/upload/editorfiles/hacks-minecraft_GM479516143.pdfIn PDF document text
    • http://en.gzyuquan.com/Public/upload/editorfiles/i-know-who-hacked-my-roblox-account_GM431946152.pdfIn PDF document text
    • http://en.gzyuquan.com/Public/upload/editorfiles/free-robux-hack-no-apps_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_off00003130.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3130 22132 bytes
SHA-256: d2da5048a35545f382e38c250cdb2e8fe0f5703919247e55d6028002788babef
font_01_sfnt_off00006248.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6248 19308 bytes
SHA-256: 1d6d529828a603e65e14b6285156acac3d11e3a25e7a00ad8dd7aee01cb73554

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