Malicious PDF — malware analysis report

Static analysis result for SHA-256 0d73630e58c969ad…

MALICIOUS

PDF

46.2 KB Created: 2021-06-09 08:29:51 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-24
MD5: 48108073b7efabb419b0efb54071590d SHA-1: 3694168577065881a5abdd0e8dc3fc04a2e9873a SHA-256: 0d73630e58c969ade3651c139f2a5362c85897ba40cbfdf65ad437b107ad3072
200 Risk Score

Malware Insights

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

The PDF contains a lure impersonating UPS, directing users to a malicious URL that is associated with game hacks and redirectors. This suggests a phishing or malware distribution attempt. The ML classifier also flagged the PDF as malicious with high confidence. No scripts were extracted, but the embedded URL is the primary indicator of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9864

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: https://netcdn.tw/app/431946152/can-you-change-your-username-on-roblox-for-free-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 https://netcdn.tw/app/431946152/can-you-change-your-username-on-roblox-for-free-game-hack In PDF document text
    • http://pustaka-smpn3tpi.com/repository/daily-free-spin-and-coin_GM406889139.pdfIn PDF document text
    • http://pustaka-smpn3tpi.com/repository/blogspot-coin-master_GM406889139.pdfIn PDF document text
    • http://pustaka-smpn3tpi.com/repository/coin-master-hack-spin-160-pro_GM406889139.pdfIn PDF document text
    • http://pustaka-smpn3tpi.com/repository/master-coin-free-spin-daily_GM406889139.pdfIn PDF document text
    • http://pustaka-smpn3tpi.com/repository/10-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://pustaka-smpn3tpi.com//repository/minecraft-app-free-download_GM479516143.pdfIn PDF document text
    • http://pustaka-smpn3tpi.com//repository/minecraft-coins-free_GM479516143.pdfIn PDF document text
    • http://pustaka-smpn3tpi.com//repository/how-to-get-free-robux-by-playing-games_GM431946152.pdfIn PDF document text
    • http://pustaka-smpn3tpi.com//repository/free-roblox-accounts-with-robux_GM431946152.pdfIn PDF document text
    • http://pustaka-smpn3tpi.com/repository/codes-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://pustaka-smpn3tpi.com/repository/coin-master-hack-without-verification-ios_GM406889139.pdfIn PDF document text
    • http://pustaka-smpn3tpi.com//repository/how-to-get-free-spins-and-coins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://pustaka-smpn3tpi.com/repository/coin-master-fan-page_GM406889139.pdfIn PDF document text
    • http://pustaka-smpn3tpi.com/repository/watch-videos-for-robux_GM431946152.pdfIn PDF document text
    • http://pustaka-smpn3tpi.com/repository/free-robux-microsoft_GM431946152.pdfIn PDF document text
    • http://pustaka-smpn3tpi.com/repository/www-coin-master-hack-com_GM406889139.pdfIn PDF document text
    • http://pustaka-smpn3tpi.com/repository/free-roblox-usernames-and-passwords_GM431946152.pdfIn PDF document text
    • http://pustaka-smpn3tpi.com/repository/roblox-inspect-consle-hacks_GM431946152.pdfIn PDF document text
    • http://pustaka-smpn3tpi.com//repository/master-coin-free-spin_GM406889139.pdfIn PDF document text
    • http://pustaka-smpn3tpi.com/repository/coin-master-hack-mod-apk-download_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
stream_004_off000051a3.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x51A3 26892 bytes
SHA-256: af7bee6480269fed769b563b7dcd6f95f1c7038b13f1c0f7515814185922c885
font_01_sfnt_off00008f12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8F12 19380 bytes
SHA-256: 45672575db6dae6b8cc80f04cdd9106524bbf75f58ff594608590a01cae73c2b

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