PDF malware analysis — malicious · d8ff99cb596d6c8d

MALICIOUS

PDF

45.0 KB Created: 2021-06-08 21:12:42 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-20

MD5: 7fdb344dcd6917b670cf4744d385e979 SHA-1: 21fe23b1df7768ffbe839e7f729f2c5559be65dc SHA-256: d8ff99cb596d6c8dd7d8324b771a997987655ad944726e1c4e749468ebf0958d

200 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file contains multiple links to known malicious redirectors and impersonates Microsoft to lure users into clicking on them. The primary link, https://netcdn.tw/app/431946152/free-t-shirt-model-roblox-game-hack, is presented as a 'free generator / game hack'. The document body, though heavily obfuscated, contains references to game hacks and download links, reinforcing the lure. The presence of embedded URLs and the ML classifier's high confidence score indicate a malicious intent, likely for credential harvesting or further payload delivery.

Machine Learning

Nyx PDF Classifier malicious score 0.9865

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/free-t-shirt-model-roblox-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/free-t-shirt-model-roblox-game-hack In PDF document text
- https://www.iseas.com/uploaded_files/userfiles/files/free-robux-videos_GM431946152.pdfIn PDF document text
- https://www.iseas.com/uploaded_files/userfiles/files/how-to-get-free-robux-on-roblox-2021_GM431946152.pdfIn PDF document text
- https://www.iseas.com/uploaded_files/userfiles/files/minecraft-maps-pe-free-download_GM479516143.pdfIn PDF document text
- https://www.iseas.com/uploaded_files/userfiles/files/roblox-robux-hack_GM431946152.pdfIn PDF document text
- https://www.iseas.com/uploaded_files/userfiles/files/coin-master-hack-apk-with-fb-login-2021_GM406889139.pdfIn PDF document text
- https://www.iseas.com/uploaded_files/userfiles/files/freerobux-co_GM431946152.pdfIn PDF document text
- https://www.iseas.com/uploaded_files/userfiles/files/coin-master-gold-cards-hack_GM406889139.pdfIn PDF document text
- https://www.iseas.com/uploaded_files/userfiles/files/coin-master-links-to-free-spins_GM406889139.pdfIn PDF document text
- https://www.iseas.com/uploaded_files/userfiles/files/oprewards-com-login_GM431946152.pdfIn PDF document text
- https://www.iseas.com/uploaded_files/userfiles/files/is-there-any-way-to-get-free-robux_GM431946152.pdfIn PDF document text
- https://www.iseas.com/uploaded_files/userfiles/files/optifine-pe_GM479516143.pdfIn PDF document text
- https://www.iseas.com/uploaded_files/userfiles/files/free-robux-pin-codes_GM431946152.pdfIn PDF document text
- https://www.iseas.com/uploaded_files/userfiles/files/free-robux-codes-no-verification_GM431946152.pdfIn PDF document text
- https://www.iseas.com/uploaded_files/userfiles/files/how-to-earn-free-spins-coin-master_GM406889139.pdfIn PDF document text
- https://www.iseas.com/uploaded_files/userfiles/files/minecraft-apk-download-v1-144-2-free_GM479516143.pdfIn PDF document text
- https://www.iseas.com/uploaded_files/userfiles/files/fast-robux-online_GM431946152.pdfIn PDF document text
- https://www.iseas.com/uploaded_files/userfiles/files/how-to-get-free-roblox-gift-cards_GM431946152.pdfIn PDF document text
- https://www.iseas.com/uploaded_files/userfiles/files/google-play-coin-master-free-spins_GM406889139.pdfIn PDF document text
- https://www.iseas.com/uploaded_files/userfiles/files/coin-master-hack-2021_GM406889139.pdfIn PDF document text
- https://www.iseas.com/uploaded_files/userfiles/files/free-coins-for-coin-master_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.

Filename	Kind	Source	Size
`font_00_sfnt_off000054be.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x54BE	24168 bytes
SHA-256: `760af10580b0f2cbf081d18e7ef75b7a0efccea068018fe072e1231567218839`
`font_01_sfnt_off00008c04.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x8C04	18708 bytes
SHA-256: `65af57e184e6ad45ecb4d351c17c135c56bb428d793da686f52dd19ee0cf2f2d`

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