PDF malware analysis — malicious · e210d24cd1216299

MALICIOUS

PDF

46.6 KB Created: 2021-06-09 03:39:22 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-07

MD5: b827b68303e8af61c2fc2789abbc5bdc SHA-1: ca8f9f05c3c810652ee288600acad0b95864d17a SHA-256: e210d24cd12162991e0888e9691c3518a7acd131be6cacf4e189a32d1d8e4c95

260 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF document employs a fake CAPTCHA lure to trick users into clicking embedded links. The links, such as 'https://netcdn.tw/app/431946152/get-free-roblox-gg-game-hack', lead to known malicious redirector infrastructure. The document also contains a large number of SEO-optimized links pointing to various game-related PDFs, suggesting a link farm designed to drive traffic to malicious sites. No scripts were extracted, but the PDF structure and link analysis strongly indicate a phishing or redirection campaign.

Machine Learning

Nyx PDF Classifier malicious score 0.9748

Heuristics 6

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.
Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM

Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
Fake CAPTCHA / human verification prompt high SE_FAKE_CAPTCHA

Document displays a fake CAPTCHA or human-verification prompt — used to trick users into running commands or pressing keyboard shortcuts
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/get-free-roblox-gg-game-hack In PDF document text
- https://c2o-library.net/catalog/repository/hack-robux_GM431946152.pdfIn PDF document text
- https://c2o-library.net/catalog/repository/best-roblox-games-with-free-beat-box_GM431946152.pdfIn PDF document text
- https://c2o-library.net/catalog/repository/how-to-get-minecraft-for-free-on-pc_GM479516143.pdfIn PDF document text
- https://c2o-library.net/catalog/repository/hack-coin-master-for-free_GM406889139.pdfIn PDF document text
- https://c2o-library.net/catalog/repository/minecraft-education-edition-free-download_GM479516143.pdfIn PDF document text
- https://c2o-library.net/catalog/repository/coin-master-free-spins-and-coins_GM406889139.pdfIn PDF document text
- https://c2o-library.net/catalog/repository/minecraft-font-free_GM479516143.pdfIn PDF document text
- https://c2o-library.net/catalog/repository/roblox-com-hack_GM431946152.pdfIn PDF document text
- https://c2o-library.net/catalog/repository/coin-master-free-spin-today_GM406889139.pdfIn PDF document text
- https://c2o-library.net/catalog/repository/www-roblox-com-free-robux_GM431946152.pdfIn PDF document text
- https://c2o-library.net/catalog/repository/minecraft-pocket-edition-free-ios_GM479516143.pdfIn PDF document text
- https://c2o-library.net/catalog/repository/how-to-change-your-roblox-username-for-free-2021_GM431946152.pdfIn PDF document text
- https://c2o-library.net/catalog/repository/how-do-you-get-free-robux-2021_GM431946152.pdfIn PDF document text
- https://c2o-library.net/catalog/repository/robux-app_GM431946152.pdfIn PDF document text
- https://c2o-library.net/catalog/repository/how-do-you-get-roblox-for-free_GM431946152.pdfIn PDF document text
- https://c2o-library.net/catalog/repository/easy-way-to-get-free-robux-on-roblox-2021_GM431946152.pdfIn PDF document text
- https://c2o-library.net/catalog/repository/minecraft-mod-menu-apk_GM479516143.pdfIn PDF document text
- https://c2o-library.net/catalog/repository/coin-master-ids-for-free-spins_GM406889139.pdfIn PDF document text
- https://c2o-library.net/catalog/repository/how-to-get-free-robux-on-mobile_GM431946152.pdfIn PDF document text
- https://c2o-library.net/catalog/repository/free-robux-without-verification-or-survey_GM431946152.pdfIn PDF document text
- http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`stream_004_off00004d64.bin`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x4D64	25128 bytes
SHA-256: `b2aeae5890adb775e0f4a249c2570a5bdc4fb4af42d0fc99aeaa04efa4261bd8`
`font_01_sfnt_off0000861f.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x861F	3884 bytes
SHA-256: `40b61f8938bd710dc29dc58ba3fde91c245a6a69596ec569b4d27c769ca417cf`
`font_02_sfnt_off000092c7.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x92C7	18340 bytes
SHA-256: `c52e6a297ffcae7df22177d86a3c071085940e05ca66069a2b55903add909985`

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