PDF malware analysis — malicious · c17cec4de13e2d6b

MALICIOUS

PDF

44.1 KB Created: 2021-05-11 03:00:40 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-16

MD5: 440dc1231ffad5024317101bf0d7aac9 SHA-1: 841d8bf6311882a4beb55c201bd314fdf8caf9a0 SHA-256: c17cec4de13e2d6b1a9bb62123d161c1ff0f5a425c6c7dfb60d8986b72918372

200 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains a critical heuristic firing for a malicious redirector link, specifically targeting users with a lure for free Robux or game hacks. It also exhibits a fake CAPTCHA heuristic, designed to trick users into interacting with the malicious link. The embedded URL leads to known malicious infrastructure, suggesting an attempt to download or redirect to a secondary payload.

Machine Learning

Nyx PDF Classifier malicious score 0.9969

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.
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
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/easy-how-to-get-free-robux-game-hack In PDF document text
- https://Buy.HoaxMC.comIn PDF document text
- https://www.allsaints-denstone.staffs.sch.uk/admin/ckfinder/userfiles/files/robux-for-surveys_GM431946152.pdfIn PDF document text
- https://www.allsaints-denstone.staffs.sch.uk/admin/ckfinder/userfiles/files/free-spin-link-of-coin-master_GM406889139.pdfIn PDF document text
- https://www.allsaints-denstone.staffs.sch.uk/admin/ckfinder/userfiles/files/coin-master-hack-uk_GM406889139.pdfIn PDF document text
- https://www.allsaints-denstone.staffs.sch.uk/admin/ckfinder/userfiles/files/coin-master-tiradas-gratis_GM406889139.pdfIn PDF document text
- https://www.allsaints-denstone.staffs.sch.uk/admin/ckfinder/userfiles/files/coin-master-332-apk-free-download_GM406889139.pdfIn PDF document text
- https://www.allsaints-denstone.staffs.sch.uk/admin/ckfinder/userfiles/files/free-roblox-accounts-with-robux_GM431946152.pdfIn PDF document text
- https://www.allsaints-denstone.staffs.sch.uk/admin/ckfinder/userfiles/files/coin-master-hack-for-ios_GM406889139.pdfIn PDF document text
- https://www.allsaints-denstone.staffs.sch.uk/admin/ckfinder/userfiles/files/coin-master-daily-free-spins-link-today_GM406889139.pdfIn PDF document text
- https://www.allsaints-denstone.staffs.sch.uk/admin/ckfinder/userfiles/files/coin-master-heaven-links_GM406889139.pdfIn PDF document text
- https://www.allsaints-denstone.staffs.sch.uk/admin/ckfinder/userfiles/files/actual-free-robux_GM431946152.pdfIn PDF document text
- https://www.allsaints-denstone.staffs.sch.uk/admin/ckfinder/userfiles/files/coin-master-gift-hack_GM406889139.pdfIn PDF document text
- https://www.allsaints-denstone.staffs.sch.uk/admin/ckfinder/userfiles/files/free-roblox-premium_GM431946152.pdfIn PDF document text
- https://www.allsaints-denstone.staffs.sch.uk/admin/ckfinder/userfiles/files/robux-hack-2021_GM431946152.pdfIn PDF document text
- https://www.allsaints-denstone.staffs.sch.uk/admin/ckfinder/userfiles/files/is-there-an-actual-hack-that-work-for-coin-master_GM406889139.pdfIn PDF document text
- https://www.allsaints-denstone.staffs.sch.uk/admin/ckfinder/userfiles/files/free-robux-gift-card-codes_GM431946152.pdfIn PDF document text
- https://www.allsaints-denstone.staffs.sch.uk/admin/ckfinder/userfiles/files/free-spins-coin-master-app_GM406889139.pdfIn PDF document text
- https://www.allsaints-denstone.staffs.sch.uk/admin/ckfinder/userfiles/files/coin-master-free-spin-link-list_GM406889139.pdfIn PDF document text
- https://www.allsaints-denstone.staffs.sch.uk/admin/ckfinder/userfiles/files/coin-master-2021-free-spins-link-today_GM406889139.pdfIn PDF document text
- https://www.allsaints-denstone.staffs.sch.uk/admin/ckfinder/userfiles/files/free-robux-hack_GM431946152.pdfIn PDF document text
- https://www.allsaints-denstone.staffs.sch.uk/admin/ckfinder/userfiles/files/free-coin-master-glitches_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
`stream_003_off00004fba.bin`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x4FBA	24840 bytes
SHA-256: `b2a73530347f8b44ab76017fb13f6f6034885adf7c12c689da06b6f0e99e8d76`
`font_01_sfnt_off000088ab.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x88AB	18688 bytes
SHA-256: `c2d85703cc6a1447500036b33f7ea43eb33cd1174df43eac9260fbff62206025`

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