Malicious PDF — malware analysis report

Static analysis result for SHA-256 cdba437e9eadd3f9…

MALICIOUS

PDF

36.3 KB Created: 2021-07-05 04:57:42 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-23
MD5: 1d8abe249cdb7b19a98c119b918cdcf1 SHA-1: 34b5d4dbb4b31e15d98ab481c096544d9aa10da8 SHA-256: cdba437e9eadd3f94fc2a2c350fdced641d0f917507a31fcf9b926d4aa8f9634
160 Risk Score

Malware Insights

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

The PDF document contains multiple links to known malicious redirector infrastructure, specifically promoting 'free Robux' or game hacks. The primary link, http://netcdn.tw/app/431946152/how-to-get-free-robux-without-verifying-game-hack, is identified as a lure for a game hack generator. While no scripts were explicitly extracted, the PDF structure and embedded links suggest a potential for exploitation or redirection to malicious sites, likely leading to further malware download or credential harvesting.

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/how-to-get-free-robux-without-verifying-game-hack In PDF document text
    • https://key8013805.com.tw/upload/files/the-best-hacker-on-roblox_GM431946152.pdfIn PDF document text
    • https://key8013805.com.tw/upload/files/microsoft-free-robux_GM431946152.pdfIn PDF document text
    • https://key8013805.com.tw/upload/files/get-robux-today_GM431946152.pdfIn PDF document text
    • https://key8013805.com.tw/upload/files/roblox-adopt-me-hacks-2021_GM431946152.pdfIn PDF document text
    • https://key8013805.com.tw/upload/files/emperor-roblox-hack_GM431946152.pdfIn PDF document text
    • https://key8013805.com.tw/upload/files/free-coins-coin-master-link_GM406889139.pdfIn PDF document text
    • https://key8013805.com.tw/upload/files/free-account-on-roblox-with-robux-and-bc_GM431946152.pdfIn PDF document text
    • https://key8013805.com.tw/upload/files/how-to-hack-robux-with-cheat-engine-64_GM431946152.pdfIn PDF document text
    • https://key8013805.com.tw/upload/files/coin-master-free-spins-and-coins-2021_GM406889139.pdfIn PDF document text
    • https://key8013805.com.tw/upload/files/free-hacking-admin-commands-roblox-jailbreak-2021_GM431946152.pdfIn PDF document text
    • https://key8013805.com.tw/upload/files/roblox-hacks-exploits-2021_GM431946152.pdfIn PDF document text
    • https://key8013805.com.tw/upload/files/hack-roblox-2021_GM431946152.pdfIn PDF document text
    • https://key8013805.com.tw/upload/files/roblox-jailbreak-hack-money-2021_GM431946152.pdfIn PDF document text
    • https://key8013805.com.tw/upload/files/free-robux-apps-that-dont-use-adgates_GM431946152.pdfIn PDF document text
    • https://key8013805.com.tw/upload/files/how-to-loopkill-on-roblox-with-cheat-engine_GM431946152.pdfIn PDF document text
    • https://key8013805.com.tw/upload/files/real-robux-generator-2021_GM431946152.pdfIn PDF document text
    • https://key8013805.com.tw/upload/files/how-to-hack-people-on-roblox_GM431946152.pdfIn PDF document text
    • https://key8013805.com.tw/upload/files/free-gear-on-the-roblox-catalog_GM431946152.pdfIn PDF document text
    • https://key8013805.com.tw/upload/files/how-to-hack-roblox-to-get-robux-2021_GM431946152.pdfIn PDF document text
    • https://key8013805.com.tw/upload/files/bloxburg-roblox-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
stream_002_off00003308.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x3308 23000 bytes
SHA-256: 50232999750374c437485a502178eed86375011b382fddd065f829f5dcd0143a
font_01_sfnt_off0000669b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x669B 19780 bytes
SHA-256: b9c7d84263575e510e678fcc2eb85effd7bc843621a598683d3ec713f50ed6b3

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