PDF malware analysis — malicious · bb1680d253b6b4de

MALICIOUS

PDF

43.4 KB Created: 2021-05-16 21:40:59 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-17

MD5: 999d19780ba12e6fa42464ba98b0d9f2 SHA-1: 0b9972653d3e620c84aa962f8431963c25d6fd40 SHA-256: bb1680d253b6b4de3325d07de09ce34c1a0f0e1c32d4b0e8a047df2b6ac96eac

222 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1071.001 Web Protocols

This PDF document contains numerous links, many of which are SEO-optimized and point to 'free generator' or 'game hack' lures. It impersonates Microsoft and presents a fake CAPTCHA to trick users into clicking a malicious link, likely for credential phishing or to download further malware. The ML classifier strongly indicates maliciousness.

Machine Learning

Nyx PDF Classifier malicious score 0.9969

Heuristics 7

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.
PDF links to a 'free generator / game hack' redirector high 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.
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
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.xyz/app/431946152/robuxfree-con-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
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 https://netcdn.xyz/app/431946152/robuxfree-con-game-hack PDF link annotation
- https://www.thecongostore.com/uploaded_files/userfiles/files/how-to-get-free-robux-on-roblox-2021_GM431946152.pdfIn PDF document text
- https://www.thecongostore.com/uploaded_files/userfiles/files/coin-master-free-spin-link-daily_GM406889139.pdfIn PDF document text
- https://www.thecongostore.com/uploaded_files/userfiles/files/free-hair-roblox-boy_GM431946152.pdfIn PDF document text
- https://www.thecongostore.com/uploaded_files/userfiles/files/free-spins-for-coin-master-without-human-verification_GM406889139.pdfIn PDF document text
- https://www.thecongostore.com/uploaded_files/userfiles/files/coin-master-2021-free-spins-link-2021_GM406889139.pdfIn PDF document text
- https://www.thecongostore.com/uploaded_files/userfiles/files/tiradas-coin-master_GM406889139.pdfIn PDF document text
- https://www.thecongostore.com/uploaded_files/userfiles/files/hackear-coin-master-sin-verificacion_GM406889139.pdfIn PDF document text
- https://www.thecongostore.com/uploaded_files/userfiles/files/how-to-earn-robux-fast_GM431946152.pdfIn PDF document text
- https://www.thecongostore.com/uploaded_files/userfiles/files/coin-master-hack-apk-download-for-android-mobile_GM406889139.pdfIn PDF document text
- https://www.thecongostore.com/uploaded_files/userfiles/files/free-robux-codes-2021_GM431946152.pdfIn PDF document text
- https://www.thecongostore.com/uploaded_files/userfiles/files/coin-master-hack-app_GM406889139.pdfIn PDF document text
- https://www.thecongostore.com/uploaded_files/userfiles/files/coin-master-hack-app-download-free_GM406889139.pdfIn PDF document text
- https://www.thecongostore.com/uploaded_files/userfiles/files/roblox-executor-free-download_GM431946152.pdfIn PDF document text
- https://www.thecongostore.com/uploaded_files/userfiles/files/free-robux-promo-codes-2021_GM431946152.pdfIn PDF document text
- https://www.thecongostore.com/uploaded_files/userfiles/files/microsoft-bing-free-robux_GM431946152.pdfIn PDF document text
- https://www.thecongostore.com/uploaded_files/userfiles/files/coin-master-heaven-free-spins-today_GM406889139.pdfIn PDF document text
- https://www.thecongostore.com/uploaded_files/userfiles/files/how-to-hack-someones-minecraft-account_GM479516143.pdfIn PDF document text
- https://www.thecongostore.com/uploaded_files/userfiles/files/coin-master-hack-cheat-generator-d_GM406889139.pdfIn PDF document text
- https://www.thecongostore.com/uploaded_files/userfiles/files/coin-master-daily-spin-free_GM406889139.pdfIn PDF document text
- https://www.thecongostore.com/uploaded_files/userfiles/files/free-robux-generator-for-kids_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.

Filename	Kind	Source	Size
`stream_003_off00004e3a.bin`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x4E3A	25340 bytes
SHA-256: `6c2241f04bb0325868883abeaaa20fd486691722e21db1ce4889fe07fcd241ce`
`font_01_sfnt_off000088b7.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x88B7	17852 bytes
SHA-256: `2abfd2a7a9970b37389a870ca2f729fd01b6f1f075e52c5d41a045b4308c3fdd`

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