PDF malware analysis — malicious · 8a33b108fea5c8ee

MALICIOUS

PDF

49.1 KB Created: 2021-06-10 13:37:59 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-08-25

MD5: 3e22d732577abbe5b80b4aed08f03625 SHA-1: 558d274925fba5252f3411b58008a9ad689fbd60 SHA-256: 8a33b108fea5c8ee3a8d78b895ea8179fb25aebf1dbb46748b5c12b7691e800e

200 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF document uses a fake CAPTCHA and a lure related to 'free Roblox game hacks' to trick users into clicking a link. This link redirects to known malicious infrastructure, indicating a phishing or credential harvesting attempt. The document's content and embedded links strongly suggest a social engineering attack designed to lead users to potentially harmful websites.

Machine Learning

Nyx PDF Classifier malicious score 0.9796

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.tw/app/431946152/free-login-roblox-game-hack In PDF document text
- https://brsolutions.pl/wp-content/uploads/fsqm-files/este-hack-de-robux-funciona-2021_GM431946152.pdfIn PDF document text
- https://brsolutions.pl/wp-content/uploads/fsqm-files/descargar-hack-phantom-forces-roblox_GM431946152.pdfIn PDF document text
- https://brsolutions.pl/wp-content/uploads/fsqm-files/how-to-hack-elemental-battlegrounds-roblox-2021_GM431946152.pdfIn PDF document text
- https://brsolutions.pl/wp-content/uploads/fsqm-files/free-not-fo-sale-roblox-templates_GM431946152.pdfIn PDF document text
- https://brsolutions.pl/wp-content/uploads/fsqm-files/roblox-murderer-mystery-2-gem-cheats_GM431946152.pdfIn PDF document text
- https://brsolutions.pl/wp-content/uploads/fsqm-files/roblox-free-download-pc-windows-10_GM431946152.pdfIn PDF document text
- https://brsolutions.pl/wp-content/uploads/fsqm-files/roblox-game-hack-download_GM431946152.pdfIn PDF document text
- https://brsolutions.pl/wp-content/uploads/fsqm-files/free-tiktok-video_GM835599320.pdfIn PDF document text
- https://brsolutions.pl/wp-content/uploads/fsqm-files/coin-master-free-spins-link-today-instagram_GM406889139.pdfIn PDF document text
- https://brsolutions.pl/wp-content/uploads/fsqm-files/free-robux-generator-no-human-verification_GM431946152.pdfIn PDF document text
- https://brsolutions.pl/wp-content/uploads/fsqm-files/roblox-is-giving-away-free-i-robux-at-rbxgift-cf_GM431946152.pdfIn PDF document text
- https://brsolutions.pl/wp-content/uploads/fsqm-files/minecraft-free-ios_GM479516143.pdfIn PDF document text
- https://brsolutions.pl/wp-content/uploads/fsqm-files/free-robux-without-information_GM431946152.pdfIn PDF document text
- https://brsolutions.pl/wp-content/uploads/fsqm-files/coin-master-hack-2021_GM406889139.pdfIn PDF document text
- https://brsolutions.pl/wp-content/uploads/fsqm-files/roblox-hack-com_GM431946152.pdfIn PDF document text
- https://brsolutions.pl/wp-content/uploads/fsqm-files/blue-stacks-robux-hack_GM431946152.pdfIn PDF document text
- https://brsolutions.pl/wp-content/uploads/fsqm-files/free-robux-gift-card-codes-2021_GM431946152.pdfIn PDF document text
- https://brsolutions.pl/wp-content/uploads/fsqm-files/how-to-make-dance-party-hack-roblox_GM431946152.pdfIn PDF document text
- https://brsolutions.pl/wp-content/uploads/fsqm-files/minecraft-marketplace-free_GM479516143.pdfIn PDF document text
- https://brsolutions.pl/wp-content/uploads/fsqm-files/how-to-hack-coins-in-reason-to-die-roblox_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_004_off000051db.bin`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x51DB	29496 bytes
SHA-256: `50f439cb9efee5a5d2661263316deab695a891c2cf5a38e38ec101ea8be226da`
`font_01_sfnt_off0000936c.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x936C	2832 bytes
SHA-256: `77ae1c4cffa647a8fd533dfa4102e94364989f9e80b9cd131876e9d1005899a2`
`font_02_sfnt_off00009d1d.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x9D1D	18356 bytes
SHA-256: `954a21ad548837f633d064e11cc2c0ea2d185e332f0fb9ff6c174ce263bef6f7`

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