Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5d2b81749d90c48…

MALICIOUS

PDF

34.3 KB Created: 2021-07-04 00:31:56 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-07-13
MD5: acd3bc441e7f0c789da7596a15bf28b6 SHA-1: d01aa5696dad7eeda61c3e138c3803e6b6cae49c SHA-256: b5d2b81749d90c48100287c962c3ba921aa2776b0bc3ab27b18c7cc0bc94bf1d
200 Risk Score

Malware Insights

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

The PDF contains multiple links to malicious redirectors, specifically advertising 'free generator / game hack' lures. One such link, http://netcdn.tw/app/431946152/dailyrobux-game-hack, is also associated with brand impersonation, specifically eBay. While no scripts were extracted, the presence of malicious links and the nature of the lures strongly suggest an attempt to trick users into visiting compromised sites, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 5

  • 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.
  • 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: http://netcdn.tw/app/431946152/dailyrobux-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
  • 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/dailyrobux-game-hack In PDF document text
    • http://stikesyahoedsmg.ac.id/Digital_Library/repository/today-coin-master-spin-free_GM406889139.pdfIn PDF document text
    • http://stikesyahoedsmg.ac.id/Digital_Library//repository/master-coin-hack-app_GM406889139.pdfIn PDF document text
    • http://stikesyahoedsmg.ac.id/Digital_Library/repository/coin-master-free-cards_GM406889139.pdfIn PDF document text
    • http://stikesyahoedsmg.ac.id/Digital_Library/repository/how-to-get-tiktok-free-followers_GM835599320.pdfIn PDF document text
    • http://stikesyahoedsmg.ac.id/Digital_Library/repository/hack-coins-in-coin-master_GM406889139.pdfIn PDF document text
    • http://stikesyahoedsmg.ac.id/Digital_Library/repository/coin-master-hack-com_GM406889139.pdfIn PDF document text
    • http://stikesyahoedsmg.ac.id/Digital_Library/repository/free-coins-coin-master-iphone_GM406889139.pdfIn PDF document text
    • http://stikesyahoedsmg.ac.id/Digital_Library//repository/roblox-fun-com-free-robux_GM431946152.pdfIn PDF document text
    • http://stikesyahoedsmg.ac.id/Digital_Library//repository/who-tiktok-free-followers_GM835599320.pdfIn PDF document text
    • http://stikesyahoedsmg.ac.id/Digital_Library//repository/free-roblox-printables_GM431946152.pdfIn PDF document text
    • http://stikesyahoedsmg.ac.id/Digital_Library/repository/robux-com-free_GM431946152.pdfIn PDF document text
    • http://stikesyahoedsmg.ac.id/Digital_Library/repository/make-free-shirts-on-roblox_GM431946152.pdfIn PDF document text
    • http://stikesyahoedsmg.ac.id/Digital_Library/repository/free-coin-master-spins-blog_GM406889139.pdfIn PDF document text
    • http://stikesyahoedsmg.ac.id/Digital_Library//repository/free-coins-on-coin-master-generator_GM406889139.pdfIn PDF document text
    • http://stikesyahoedsmg.ac.id/Digital_Library//repository/lazyblocks-com-robux_GM431946152.pdfIn PDF document text
    • http://stikesyahoedsmg.ac.id/Digital_Library/repository/free-robux-real-2021_GM431946152.pdfIn PDF document text
    • http://stikesyahoedsmg.ac.id/Digital_Library/repository/how-to-get-free-robux-on-roblox-2021_GM431946152.pdfIn PDF document text
    • http://stikesyahoedsmg.ac.id/Digital_Library/repository/daily-coin-master-free_GM406889139.pdfIn PDF document text
    • http://stikesyahoedsmg.ac.id/Digital_Library/repository/free-code-for-roblox-unicorn_GM431946152.pdfIn PDF document text
    • http://stikesyahoedsmg.ac.id/Digital_Library/repository/anyway-to-legally-get-free-robux_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_off000030ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x30EF 21684 bytes
SHA-256: a1e7cd4e8a68274db8eb183155481ace3bb7f28af05da787a2407cdbd28d0c49
font_01_sfnt_off000060bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x60BD 19092 bytes
SHA-256: 319a3b741e60406540a19adb70d742732d8bf817a9bc58f36e4d58ba7e1a6a2d

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