PDF malware analysis — malicious · d57d75ba5a22b0ac

MALICIOUS

PDF

47.0 KB Created: 2021-05-14 12:00:45 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29

MD5: 620f68b32ade8ca4c137e4f2ae7175f4 SHA-1: 2170ef46ad2e6e50933bf6c3a32d7a3e1d5df725 SHA-256: d57d75ba5a22b0ac662a2d9306d1814964a17ca700b9ee846f17b9da1a55dee2

182 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF document contains a fake CAPTCHA lure to trick users into clicking links, which are part of a link farm. The primary URL leads to a 'free Robux' generator, and the document body contains numerous links to other PDF files hosted on similar domains, suggesting a campaign to drive traffic to potentially malicious content. No scripts were extracted, but the PDF structure and embedded links indicate a social engineering attack.

Machine Learning

Nyx PDF Classifier malicious score 0.8948

Heuristics 6

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
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/free-robux-no-verification-game-hack PDF link annotation
- https://elearning.mtsn6nganjuk.sch.id/__statics/gudangsoal/files/free-robux-hack_GM431946152.pdfIn PDF document text
- https://elearning.mtsn6nganjuk.sch.id/__statics/gudangsoal/files/games-that-give-free-robux_GM431946152.pdfIn PDF document text
- https://elearning.mtsn6nganjuk.sch.id/__statics/gudangsoal/files/coin-master-free-spin-app-apk_GM406889139.pdfIn PDF document text
- https://elearning.mtsn6nganjuk.sch.id/__statics/gudangsoal/files/roblox-moderators_GM431946152.pdfIn PDF document text
- https://elearning.mtsn6nganjuk.sch.id/__statics/gudangsoal/files/how-do-you-get-free-pet-food-in-coin-master_GM406889139.pdfIn PDF document text
- https://elearning.mtsn6nganjuk.sch.id/__statics/gudangsoal/files/minecraft-images-free_GM479516143.pdfIn PDF document text
- https://elearning.mtsn6nganjuk.sch.id/__statics/gudangsoal/files/minecraft-java-edition-download-free_GM479516143.pdfIn PDF document text
- https://elearning.mtsn6nganjuk.sch.id/__statics/gudangsoal/files/free-robux-co_GM431946152.pdfIn PDF document text
- https://elearning.mtsn6nganjuk.sch.id/__statics/gudangsoal/files/how-to-use-scripts-in-roblox-hack_GM431946152.pdfIn PDF document text
- https://elearning.mtsn6nganjuk.sch.id/__statics/gudangsoal/files/how-to-hack-someone-on-roblox_GM431946152.pdfIn PDF document text
- https://elearning.mtsn6nganjuk.sch.id/__statics/gudangsoal/files/get-free-robux-without-doing-anything_GM431946152.pdfIn PDF document text
- https://elearning.mtsn6nganjuk.sch.id/__statics/gudangsoal/files/how-can-you-get-free-robux_GM431946152.pdfIn PDF document text
- https://elearning.mtsn6nganjuk.sch.id/__statics/gudangsoal/files/free-coin-master-hack-no-verification_GM406889139.pdfIn PDF document text
- https://elearning.mtsn6nganjuk.sch.id/__statics/gudangsoal/files/free-roblox-accounts-2021-with-robux_GM431946152.pdfIn PDF document text
- https://elearning.mtsn6nganjuk.sch.id/__statics/gudangsoal/files/roblox-free-clothes-hack_GM431946152.pdfIn PDF document text
- https://elearning.mtsn6nganjuk.sch.id/__statics/gudangsoal/files/how-to-get-free-premium-roblox_GM431946152.pdfIn PDF document text
- https://elearning.mtsn6nganjuk.sch.id/__statics/gudangsoal/files/how-to-hack-coin-master-ios_GM406889139.pdfIn PDF document text
- https://elearning.mtsn6nganjuk.sch.id/__statics/gudangsoal/files/free-rare-cards-for-coin-master-christmas_GM406889139.pdfIn PDF document text
- https://elearning.mtsn6nganjuk.sch.id/__statics/gudangsoal/files/coin-master-game-hunters-club_GM406889139.pdfIn PDF document text
- https://elearning.mtsn6nganjuk.sch.id/__statics/gudangsoal/files/how-to-free-robux_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_003_off00004f11.bin`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x4F11	25428 bytes
SHA-256: `43d24d9b8a0a7eedea4b82b2936457dc966b15b7e7d9900e1ab82c22e406234a`
`font_01_sfnt_off00008a45.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x8A45	2880 bytes
SHA-256: `10d025f04f706eb71cdda4f99784df1b9ccb52e48080e43095e0398eaef6f132`
`font_02_sfnt_off0000942f.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x942F	18600 bytes
SHA-256: `361892a278de990f6dfe9fe9f512a0ec39aeba1740037781b92f32c6ad2b5051`

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