PDF malware analysis — malicious · e485a72d0137332a

MALICIOUS

PDF

44.0 KB Created: 2021-05-11 03:51:43 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-27

MD5: 96522e8b25ef623c106be4dff5c5982c SHA-1: 5303c0f12de7fc29ed766c11847e8a5c8a9d2afc SHA-256: e485a72d0137332a34db47f8090e28076ac238dd82fbb29eaff1f55070e9d3ff

222 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links designed to appear as 'free generators' or 'game hacks' for popular platforms like Roblox, impersonating brands such as Microsoft. This strongly suggests a credential phishing or scamming attempt. The presence of a fake CAPTCHA lure further supports the malicious intent to trick users into interacting with malicious content. While no scripts were directly extracted, the PDF structure and embedded links indicate a high likelihood of leading to further malicious activity.

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/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
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/roblox-com-games-referrer-roblox-player-game-hack PDF link annotation
- http://pustaka.polbangtan-gowa.ac.id/repository/free-robux-no-human-verification-or-survey-2021_GM431946152.pdfIn PDF document text
- http://pustaka.polbangtan-gowa.ac.id//repository/ways-to-get-free-robux-2021_GM431946152.pdfIn PDF document text
- http://pustaka.polbangtan-gowa.ac.id/repository/coin-master-free-spins-that-really_GM406889139.pdfIn PDF document text
- http://pustaka.polbangtan-gowa.ac.id//repository/roblox-its-free_GM431946152.pdfIn PDF document text
- http://pustaka.polbangtan-gowa.ac.id/repository/roblox-free-play-no-download_GM431946152.pdfIn PDF document text
- http://pustaka.polbangtan-gowa.ac.id//repository/coin-master-free-spins-generator-no-human-verification_GM406889139.pdfIn PDF document text
- http://pustaka.polbangtan-gowa.ac.id/repository/free-attacks-on-coin-master_GM406889139.pdfIn PDF document text
- http://pustaka.polbangtan-gowa.ac.id/repository/free-robux-generator-2021_GM431946152.pdfIn PDF document text
- http://pustaka.polbangtan-gowa.ac.id/repository/mcpe-master-unlimited-coins-free-download_GM406889139.pdfIn PDF document text
- http://pustaka.polbangtan-gowa.ac.id//repository/hack-coin-master-iphone_GM406889139.pdfIn PDF document text
- http://pustaka.polbangtan-gowa.ac.id/repository/martian-lettuce-coin-master-free_GM406889139.pdfIn PDF document text
- http://pustaka.polbangtan-gowa.ac.id/repository/give-me-free-robux_GM431946152.pdfIn PDF document text
- http://pustaka.polbangtan-gowa.ac.id//repository/free-robux-no-human-verification-or-survey_GM431946152.pdfIn PDF document text
- http://pustaka.polbangtan-gowa.ac.id//repository/roblox-gang_GM431946152.pdfIn PDF document text
- http://pustaka.polbangtan-gowa.ac.id//repository/coin-master-coins_GM406889139.pdfIn PDF document text
- http://pustaka.polbangtan-gowa.ac.id//repository/coin-master-free-spins-link-2021_GM406889139.pdfIn PDF document text
- http://pustaka.polbangtan-gowa.ac.id/repository/coin-master-400-spin-link-today_GM406889139.pdfIn PDF document text
- http://pustaka.polbangtan-gowa.ac.id/repository/coin-master-hack-2021_GM406889139.pdfIn PDF document text
- http://pustaka.polbangtan-gowa.ac.id/repository/coin-master-hack-for-ios_GM406889139.pdfIn PDF document text
- http://pustaka.polbangtan-gowa.ac.id//repository/free-robux-hack-no-verification_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_off00004ca7.bin`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x4CA7	26360 bytes
SHA-256: `5a61f84647c4ab2ef9c9db3fccba66c99cc0d1aebd9756cac9a412d30dabacaa`
`font_01_sfnt_off000088e4.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x88E4	18608 bytes
SHA-256: `fe127bfd5ab6a4b2b53b099a15c551b8e40bc135ed62b4e782cd2911e4f76f6e`

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