Malicious PDF — malware analysis report

Static analysis result for SHA-256 df3ae40ba081692d…

MALICIOUS

PDF

33.9 KB Created: 2021-07-06 08:53:19 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-24
MD5: 063c77ea103e0441488bc5c6631b34e3 SHA-1: a9b2f58aa823dcc03f792ceefeccc4ca05dd98ad SHA-256: df3ae40ba081692dab38f30e04ad2411f68a6c6df518a30145d8c2e8a62fa081
200 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF document contains multiple links to a malicious redirector, masquerading as a 'Robux Hack Generator' and impersonating Microsoft. The primary malicious URL is http://netcdn.tw/app/431946152/robux-hack-generator-game-hack, which is designed to lure users into clicking it. No scripts were extracted, but the presence of embedded URLs and the lure suggest a phishing or malware distribution attempt.

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/robux-hack-generator-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/robux-hack-generator-game-hack In PDF document text
    • http://library.acehresearch.org/repository/how-do-i-get-free-robux-on-phone_GM431946152.pdfIn PDF document text
    • http://library.acehresearch.org/repository/el-mejor-hack-de-roblox_GM431946152.pdfIn PDF document text
    • http://library.acehresearch.org/repository/rblx-gg-free-robux_GM431946152.pdfIn PDF document text
    • http://library.acehresearch.org/repository/how-to-get-free-robux-without-tasks_GM431946152.pdfIn PDF document text
    • http://library.acehresearch.org/repository/roblox-cheat-engine-downlaod_GM431946152.pdfIn PDF document text
    • http://library.acehresearch.org/repository/earn-robux-com_GM431946152.pdfIn PDF document text
    • http://library.acehresearch.org/repository/free-robux-kid-friendly-no-human-verification_GM431946152.pdfIn PDF document text
    • http://library.acehresearch.org/repository/roblox-hack-phantom-forces-cheat_GM431946152.pdfIn PDF document text
    • http://library.acehresearch.org/repository/funny-roblox-avatar-free_GM431946152.pdfIn PDF document text
    • http://library.acehresearch.org/repository/how-to-install-minecraft-for-free_GM479516143.pdfIn PDF document text
    • http://library.acehresearch.org/repository/free-roblox-t-shitt_GM431946152.pdfIn PDF document text
    • http://library.acehresearch.org/repository/roblox-teleport-hack-jailbreak_GM431946152.pdfIn PDF document text
    • http://library.acehresearch.org/repository/omnija-roblox-cheat_GM431946152.pdfIn PDF document text
    • http://library.acehresearch.org/repository/free-robux-generator-no-human-verification-2021_GM431946152.pdfIn PDF document text
    • http://library.acehresearch.org/repository/roblox-codes-toys-free_GM431946152.pdfIn PDF document text
    • http://library.acehresearch.org/repository/coin-master-free-spin-app-apk_GM406889139.pdfIn PDF document text
    • http://library.acehresearch.org/repository/free-robux-giveaway_GM431946152.pdfIn PDF document text
    • http://library.acehresearch.org/repository/microsoft-roblox_GM431946152.pdfIn PDF document text
    • http://library.acehresearch.org/repository/how-to-cheat-in-booga-booga-roblox_GM431946152.pdfIn PDF document text
    • http://library.acehresearch.org/repository/how-to-earn-robux-for-free-2021_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_off00002e99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2E99 22284 bytes
SHA-256: c98282036d000de05df25a73ef8266e5cd7bad93354e34981c64b83659d35f24
font_01_sfnt_off00005ffb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5FFB 18824 bytes
SHA-256: 6a2f4fb47bcac7a1427eb84fb186ae35d3638566a93e34d85c8a35338f058712

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