PDF malware analysis — malicious · a5d37c893dc12bf4

MALICIOUS

PDF

33.5 KB Created: 2021-06-26 20:53:49 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-16

MD5: 4a0cddca6b8c3853d9a016f69fca2db3 SHA-1: 92bc5cfc189a4633fd436a9da5f39bb0524bc6f7 SHA-256: a5d37c893dc12bf44610dca45b4db9dbfebb91d27b3f86288af93b2f084aa403

82 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF document contains numerous links, including algorithmically generated URLs, that promise free in-game items and hacks. The ML classifier strongly flagged this PDF as malicious, and the presence of external URIs and a download button lure further support a malicious intent. The document likely serves as a lure to download a second-stage payload or redirect to a phishing site, aligning with spearphishing attachment tactics.

Machine Learning

Nyx PDF Classifier malicious score 0.9824

Heuristics 4

PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK

PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not 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
External URI info PDF_URI

PDF contains an external URL action
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.co/app/431946152/kazuin-how-to-hack-in-roblox-game-hack PDF link annotation
- https://www.toyogas.com.tw/upload/files/free-tbc-upgrade-roblox_GM431946152.pdfIn PDF document text
- https://www.toyogas.com.tw/upload/files/free-coin-master-links_GM406889139.pdfIn PDF document text
- https://www.toyogas.com.tw/upload/files/free-robux-no-verification_GM431946152.pdfIn PDF document text
- https://www.toyogas.com.tw/upload/files/minecraft-free-ios_GM479516143.pdfIn PDF document text
- https://www.toyogas.com.tw/upload/files/httpswwwurcouponsdealcom202103coinmasterfreespinandcoinlinkshtml_GM406889139.pdfIn PDF document text
- https://www.toyogas.com.tw/upload/files/roblox-executor-free-download_GM431946152.pdfIn PDF document text
- https://www.toyogas.com.tw/upload/files/roblox-redeem_GM431946152.pdfIn PDF document text
- https://www.toyogas.com.tw/upload/files/www-free-robux_GM431946152.pdfIn PDF document text
- https://www.toyogas.com.tw/upload/files/websites-that-give-you-free-robux_GM431946152.pdfIn PDF document text
- https://www.toyogas.com.tw/upload/files/minecraft-free-download-chromebook_GM479516143.pdfIn PDF document text
- https://www.toyogas.com.tw/upload/files/minecraft-account-hacked_GM479516143.pdfIn PDF document text
- https://www.toyogas.com.tw/upload/files/roblox-lua-scripts-for-cheat-engine_GM431946152.pdfIn PDF document text
- https://www.toyogas.com.tw/upload/files/free-clothes-maker-roblox_GM431946152.pdfIn PDF document text
- https://www.toyogas.com.tw/upload/files/robux-for-surveys_GM431946152.pdfIn PDF document text
- https://www.toyogas.com.tw/upload/files/free-spins-on-coin-master-without-human-verification_GM406889139.pdfIn PDF document text
- https://www.toyogas.com.tw/upload/files/roblox-hack-gui-free_GM431946152.pdfIn PDF document text
- https://www.toyogas.com.tw/upload/files/free-robux-hack-us_GM431946152.pdfIn PDF document text
- https://www.toyogas.com.tw/upload/files/free-roblox-money_GM431946152.pdfIn PDF document text
- https://www.toyogas.com.tw/upload/files/getrobux-info_GM431946152.pdfIn PDF document text
- https://www.toyogas.com.tw/upload/files/how-to-get-a-free-minecraft-account_GM479516143.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.

Filename	Kind	Source	Size
`font_00_sfnt_off00002aa3.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x2AA3	22832 bytes
SHA-256: `974a45d6297ddddc32a5796d512997ea20c59dc0b71d5b620f508071d8a11b6a`
`font_01_sfnt_off00005dc5.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x5DC5	19164 bytes
SHA-256: `2f0aede41017af6a2e2f4844c40a09721f6741597f8809fbb1f09bfe29f14235`

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