PDF malware analysis — malicious · 353bcdf707965d06

MALICIOUS

PDF

46.6 KB Created: 2021-05-17 01:01:25 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-01

MD5: 1260da125e8a5af280e964fce1d74a17 SHA-1: bafdc582d3c136901cda607cff8e3c5ffa7fc870 SHA-256: 353bcdf707965d0686bb2c97aa6f76dd61fec83f9be5bd27c927f49f35a361f9

182 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF document was flagged as malicious by an ML classifier. It uses a fake-CAPTCHA lure. The file embeds a large number of external links characteristic of an SEO link farm, routes users through malicious redirector infrastructure and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

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/406889139/coin-master-free-spins-and-coins-daily-game-hack PDF link annotation
- http://www.advanceenglish.com.au/uploaded_files/userfiles/files/pop-slots-free-vegas-casino-slot-machine-game-coin-master_GM406889139.pdfIn PDF document text
- http://www.advanceenglish.com.au/uploaded_files/userfiles/files/robux-hack-2021_GM431946152.pdfIn PDF document text
- http://www.advanceenglish.com.au/uploaded_files/userfiles/files/free-spin-coin-master-link-today_GM406889139.pdfIn PDF document text
- http://www.advanceenglish.com.au/uploaded_files/userfiles/files/chisel-and-bits-mod-minecraft-pe_GM479516143.pdfIn PDF document text
- http://www.advanceenglish.com.au/uploaded_files/userfiles/files/free-spins-for-coin-master-game_GM406889139.pdfIn PDF document text
- http://www.advanceenglish.com.au/uploaded_files/userfiles/files/coin-master-links-for-today_GM406889139.pdfIn PDF document text
- http://www.advanceenglish.com.au/uploaded_files/userfiles/files/free-spin-link-coin-master_GM406889139.pdfIn PDF document text
- http://www.advanceenglish.com.au/uploaded_files/userfiles/files/robuxmatchcom-free-robux_GM431946152.pdfIn PDF document text
- http://www.advanceenglish.com.au/uploaded_files/userfiles/files/static-moonactive_GM406889139.pdfIn PDF document text
- http://www.advanceenglish.com.au/uploaded_files/userfiles/files/free-robux-com-real_GM431946152.pdfIn PDF document text
- http://www.advanceenglish.com.au/uploaded_files/userfiles/files/coin-master-free-spins-23-march-2021_GM406889139.pdfIn PDF document text
- http://www.advanceenglish.com.au/uploaded_files/userfiles/files/coin-master-free-coins-and-spins_GM406889139.pdfIn PDF document text
- http://www.advanceenglish.com.au/uploaded_files/userfiles/files/coin-master-gold-cards-hack_GM406889139.pdfIn PDF document text
- http://www.advanceenglish.com.au/uploaded_files/userfiles/files/free-robux-just-click_GM431946152.pdfIn PDF document text
- http://www.advanceenglish.com.au/uploaded_files/userfiles/files/how-to-make-a-minecraft-pe-server-for-free_GM479516143.pdfIn PDF document text
- http://www.advanceenglish.com.au/uploaded_files/userfiles/files/free-roblox-accounts-with-robux-2021_GM431946152.pdfIn PDF document text
- http://www.advanceenglish.com.au/uploaded_files/userfiles/files/free-daily-spins-coin-master_GM406889139.pdfIn PDF document text
- http://www.advanceenglish.com.au/uploaded_files/userfiles/files/coin-master-spin-and-coins-free_GM406889139.pdfIn PDF document text
- http://www.advanceenglish.com.au/uploaded_files/userfiles/files/coin-master-free-gold-cards_GM406889139.pdfIn PDF document text
- http://www.advanceenglish.com.au/uploaded_files/userfiles/files/coin-master-get-free-spins_GM406889139.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_off00004d0c.bin`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x4D0C	25424 bytes
SHA-256: `fa75a56a5699d55d8d31dedf315d9e4d70fb2b1b6d9a5d8982301825e4e80032`
`font_01_sfnt_off00008644.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x8644	3600 bytes
SHA-256: `daf556f36eb9fdb58e3f185d560e2a1cbaa8be40ea85eb747afef6273d779d1c`
`font_02_sfnt_off000092f3.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x92F3	18480 bytes
SHA-256: `e9052e0f9c593188345ba389179451ef12c6c6a401d56a628cce0964dfd3917c`

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