PDF malware analysis — malicious · e8bdc80d55f0c0a0

MALICIOUS

PDF

46.1 KB Created: 2021-06-04 05:20:39 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-16

MD5: bf497542a3cdc26578c9f3203300cac9 SHA-1: 3095e4fd5efdc8907be3970e3861fa9b5e24ea5a SHA-256: e8bdc80d55f0c0a03446726dc7a6491d9960e6735d8291c8ef04de5321eb8c85

200 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains multiple heuristics indicating it's a malicious redirector and credential phishing lure, specifically impersonating Facebook and offering game-related hacks. The embedded URL, https://netcdn.online/app/431946152/roblox-com-games-referrer-roblox-player-game-hack, is a known malicious redirector. The document body, though heavily obfuscated, contains references to Roblox and game hacks, aligning with the heuristic findings.

Machine Learning

Nyx PDF Classifier malicious score 0.9864

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.online/app/431946152/roblox-com-games-referrer-roblox-player-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.online/app/431946152/roblox-com-games-referrer-roblox-player-game-hack In PDF document text
- https://www.bridalguide.com/sites/default/files/files/free-spins-and-coins-blogspot-coin-master_GM406889139.pdfIn PDF document text
- https://www.bridalguide.com/sites/default/files/files/minecraft-account-hacked_GM479516143.pdfIn PDF document text
- https://www.bridalguide.com/sites/default/files/files/coin-master-link_GM406889139.pdfIn PDF document text
- https://www.bridalguide.com/sites/default/files/files/no-human-verification-hack-for-coin-master_GM406889139.pdfIn PDF document text
- https://www.bridalguide.com/sites/default/files/files/coin-master-free-cards_GM406889139.pdfIn PDF document text
- https://www.bridalguide.com/sites/default/files/files/roblox-hack-2021_GM431946152.pdfIn PDF document text
- https://www.bridalguide.com/sites/default/files/files/free-coin-master-spins-2021_GM406889139.pdfIn PDF document text
- https://www.bridalguide.com/sites/default/files/files/robux-matchcomfree-robux_GM431946152.pdfIn PDF document text
- https://www.bridalguide.com/sites/default/files/files/roblox-earn_GM431946152.pdfIn PDF document text
- https://www.bridalguide.com/sites/default/files/files/toolbox-mod_GM479516143.pdfIn PDF document text
- https://www.bridalguide.com/sites/default/files/files/mobihack-net-roblox-hack_GM431946152.pdfIn PDF document text
- https://www.bridalguide.com/sites/default/files/files/roblox-hack-scripts-pastebin_GM431946152.pdfIn PDF document text
- https://www.bridalguide.com/sites/default/files/files/free-roblox-account-generator_GM431946152.pdfIn PDF document text
- https://www.bridalguide.com/sites/default/files/files/coin-master-hack-mod-apk-unlimited-spins_GM406889139.pdfIn PDF document text
- https://www.bridalguide.com/sites/default/files/files/can-pubg-uc-be-hacked_GM1330123889.pdfIn PDF document text
- https://www.bridalguide.com/sites/default/files/files/is-roblox-studio-free_GM431946152.pdfIn PDF document text
- https://www.bridalguide.com/sites/default/files/files/free-promo-codes-for-robux_GM431946152.pdfIn PDF document text
- https://www.bridalguide.com/sites/default/files/files/coin-master-2021-free-spins_GM406889139.pdfIn PDF document text
- https://www.bridalguide.com/sites/default/files/files/coin-master-level-4_GM406889139.pdfIn PDF document text
- https://www.bridalguide.com/sites/default/files/files/free-minecraft-thumbnails_GM479516143.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_off000053c0.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x53C0	26552 bytes
SHA-256: `b2150046d1a7bac7362cae80969f3ec90a38ab871bc5a9e7032db5d685c188b6`
`font_01_sfnt_off000090bf.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x90BF	18608 bytes
SHA-256: `fe127bfd5ab6a4b2b53b099a15c551b8e40bc135ed62b4e782cd2911e4f76f6e`

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