PDF malware analysis — malicious · 633b0f07dd77b661

MALICIOUS

PDF

46.6 KB Created: 2021-06-01 11:11:45 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-24

MD5: d37da981b2d0c28b3c254dcdeb43ffba SHA-1: d96855d7fbeab62e6dc78ea94fbf993e2738233e SHA-256: 633b0f07dd77b661c0eb92793c9eedb1a27957429406e193ca4357f67f69fed8

188 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

This PDF document is designed to lure users into clicking on links that lead to malicious redirectors, disguised as free game currency generators. The document contains multiple embedded URLs pointing to these redirectors, and the ML classifier strongly indicates maliciousness. The primary malicious link identified is https://netcdn.xyz/app/431946152/50-robux-free-codes-game-hack.

Machine Learning

Nyx PDF Classifier malicious score 0.9748

Heuristics 6

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.
Callback phishing phone lure medium SE_CALLBACK_LURE

Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
Urgency / deadline lure low SE_URGENCY_LURE

Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
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/431946152/50-robux-free-codes-game-hack In PDF document text
- https://sktc.se/wp-content/uploads/fsqm-files/robux-free-com_GM431946152.pdfIn PDF document text
- https://sktc.se/wp-content/uploads/fsqm-files/get-free-rank-in-roblox-group_GM431946152.pdfIn PDF document text
- https://sktc.se/wp-content/uploads/fsqm-files/how-to-get-free-robux-on-roblox-on-a-computer_GM431946152.pdfIn PDF document text
- https://sktc.se/wp-content/uploads/fsqm-files/free-robux-working_GM431946152.pdfIn PDF document text
- https://sktc.se/wp-content/uploads/fsqm-files/how-to-get-free-robux-2021-october_GM431946152.pdfIn PDF document text
- https://sktc.se/wp-content/uploads/fsqm-files/free-roblox-accounts-june-2021_GM431946152.pdfIn PDF document text
- https://sktc.se/wp-content/uploads/fsqm-files/free-robux-no-human-verification-or-survey-2021_GM431946152.pdfIn PDF document text
- https://sktc.se/wp-content/uploads/fsqm-files/free-robux-giveaway_GM431946152.pdfIn PDF document text
- https://sktc.se/wp-content/uploads/fsqm-files/roblox-dbz-final-stand-hack_GM431946152.pdfIn PDF document text
- https://sktc.se/wp-content/uploads/fsqm-files/roblox-hub-free-fiv-server_GM431946152.pdfIn PDF document text
- https://sktc.se/wp-content/uploads/fsqm-files/secret-cheats-for-roblox_GM431946152.pdfIn PDF document text
- https://sktc.se/wp-content/uploads/fsqm-files/free-robux-websites-no-human-verification_GM431946152.pdfIn PDF document text
- https://sktc.se/wp-content/uploads/fsqm-files/free-tiktok-followers-app_GM835599320.pdfIn PDF document text
- https://sktc.se/wp-content/uploads/fsqm-files/free-codes-for-roblox-wild-revolvers_GM431946152.pdfIn PDF document text
- https://sktc.se/wp-content/uploads/fsqm-files/bypass-roblox-cheat-engine-2021_GM431946152.pdfIn PDF document text
- https://sktc.se/wp-content/uploads/fsqm-files/rblx-city-free-robux_GM431946152.pdfIn PDF document text
- https://sktc.se/wp-content/uploads/fsqm-files/coin-master-free-daily-spins-link_GM406889139.pdfIn PDF document text
- https://sktc.se/wp-content/uploads/fsqm-files/minecraft-windows-10-edition-free_GM479516143.pdfIn PDF document text
- https://sktc.se/wp-content/uploads/fsqm-files/how-to-hack-roblox-accounts-on-phone_GM431946152.pdfIn PDF document text
- https://sktc.se/wp-content/uploads/fsqm-files/free-minecraft-resource-packs_GM479516143.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_off00005082.bin`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x5082	24752 bytes
SHA-256: `4923cf947cdf3d3ac494f143825971e6b24079674879aa60fc0bc5852406dcaa`
`font_01_sfnt_off000088e8.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x88E8	2812 bytes
SHA-256: `fc92a80cefddbcc51cb4ecd7284aa73b746cbd66adcf1d96110f0323ec06b51f`
`font_02_sfnt_off00009289.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x9289	18496 bytes
SHA-256: `d93ea54294014936ab0309df1aff5ddc088bb97eab0a63dd8c8d193fa5861cff`

Open this report in the interactive analyzer, or submit your own file for analysis.