PDF malware analysis — malicious · f88508474389a54d

MALICIOUS

PDF

46.0 KB Created: 2021-05-14 06:37:35 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-16

MD5: c70984b9ff542599ccc95cb5879e4090 SHA-1: 5cf38ad7b33e74b20439f0e9e9f2107c0424f9e3 SHA-256: f88508474389a54d7ed1c9be6f317e83335605f754a33fe86521b3a1ae08590c

260 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are part of a link farm designed to appear as legitimate resources for game hacks and generators. One primary URL, 'https://netcdn.xyz/app/431946152/a-lot-of-robux-game-hack', is identified as a malicious redirector. The document also presents a fake CAPTCHA or human verification prompt to trick users into interacting further. While no scripts were explicitly extracted, the overall structure and link farm suggest a phishing or malware distribution attempt.

Machine Learning

Nyx PDF Classifier malicious score 0.9432

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.
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.
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/a-lot-of-robux-game-hack In PDF document text
- https://www.vireco.net/ckfinder/userfiles/files/smart-lodhi-coin-master-hack_GM406889139.pdfIn PDF document text
- https://www.vireco.net/ckfinder/userfiles/files/i-need-more-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
- https://www.vireco.net/ckfinder/userfiles/files/toolbox-premium-apk_GM479516143.pdfIn PDF document text
- https://www.vireco.net/ckfinder/userfiles/files/how-to-get-free-robux-2021-easy_GM431946152.pdfIn PDF document text
- https://www.vireco.net/ckfinder/userfiles/files/get-free-robux-2021_GM431946152.pdfIn PDF document text
- https://www.vireco.net/ckfinder/userfiles/files/coin-master-daily-free-spins-link-facebook_GM406889139.pdfIn PDF document text
- https://www.vireco.net/ckfinder/userfiles/files/how-to-get-free-robux-for-free_GM431946152.pdfIn PDF document text
- https://www.vireco.net/ckfinder/userfiles/files/roblox-games-to-play-for-free_GM431946152.pdfIn PDF document text
- https://www.vireco.net/ckfinder/userfiles/files/free-spins-october-28-2021-coin-master_GM406889139.pdfIn PDF document text
- https://www.vireco.net/ckfinder/userfiles/files/free-account-roblox-with-robux_GM431946152.pdfIn PDF document text
- https://www.vireco.net/ckfinder/userfiles/files/free-spin-links-coin-master-2021_GM406889139.pdfIn PDF document text
- https://www.vireco.net/ckfinder/userfiles/files/coin-master-hack-apk-april-12-2021_GM406889139.pdfIn PDF document text
- https://www.vireco.net/ckfinder/userfiles/files/coin-master-free-spins-2021_GM406889139.pdfIn PDF document text
- https://www.vireco.net/ckfinder/userfiles/files/coin-master-hack-tool-exe_GM406889139.pdfIn PDF document text
- https://www.vireco.net/ckfinder/userfiles/files/coin-master-free-spins-23-march-2021_GM406889139.pdfIn PDF document text
- https://www.vireco.net/ckfinder/userfiles/files/free-spin-app-coin-master_GM406889139.pdfIn PDF document text
- https://www.vireco.net/ckfinder/userfiles/files/roblox-hack-me_GM431946152.pdfIn PDF document text
- https://www.vireco.net/ckfinder/userfiles/files/coin-master-fun-hack_GM406889139.pdfIn PDF document text
- https://www.vireco.net/ckfinder/userfiles/files/rbx-hut_GM431946152.pdfIn PDF document text
- https://www.vireco.net/ckfinder/userfiles/files/coin-master-app-for-free-spins_GM406889139.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_003_off00004956.bin`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x4956	25956 bytes
SHA-256: `481d35150d954ba4a9cf607b371f66d691b342dfa163f675816db629f94851b2`
`font_01_sfnt_off00008501.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x8501	5696 bytes
SHA-256: `450e3ee45915afe13702bf1d587eb8b9ad88a8d2113419ac9f2fd116a828e139`
`font_02_sfnt_off00009213.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x9213	17952 bytes
SHA-256: `59ace597cf85b15723adf2883f87d3990bd92e723e57ffb30000155e26dd48af`

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