PDF malware analysis — malicious · da30fe2190a147db

MALICIOUS

PDF

35.6 KB Created: 2021-07-03 22:45:48 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-24

MD5: 5da6c9a7f907d6dad46d758cf16d1201 SHA-1: cc0c12c88b3820cb86c399840601d7918d55b49d SHA-256: da30fe2190a147dbe51ea4c4829645c94ce0b3238a7d32a30aa4be045cc508ee

180 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a malformed exploit stream and links to known malicious redirector infrastructure, specifically advertising 'free Roblox accounts' and 'game hacks'. The primary lure URL is http://netcdn.tw/app/431946152/free-roblox-accounts-that-work-game-hack, which is part of a pattern of redirecting users to potentially malicious sites. The ML classifier strongly indicates malicious intent.

Machine Learning

Nyx PDF Classifier malicious score 0.9984

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.
Malformed active-content stream length medium PDF_MALFORMED_EXPLOIT_STREAM_LENGTH

A PDF stream that carries active/exploit-looking content has a declared /Length that does not match the recovered stream body. Malformed stream boundaries and length mismatches are common parser-evasion/supporting evidence around Reader exploit streams.
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 http://netcdn.tw/app/431946152/free-roblox-accounts-that-work-game-hack In PDF document text
- http://e-learningman2wonosobo.my.id/__statics/gudangsoal/files/coin-master-links-2021_GM406889139.pdfIn PDF document text
- http://e-learningman2wonosobo.my.id/__statics/gudangsoal/files/roblox-shirt-texture-free-shipping_GM431946152.pdfIn PDF document text
- http://e-learningman2wonosobo.my.id/__statics/gudangsoal/files/how-to-make-clothes-on-roblox-for-free_GM431946152.pdfIn PDF document text
- http://e-learningman2wonosobo.my.id/__statics/gudangsoal/files/easy-how-to-get-free-robux_GM431946152.pdfIn PDF document text
- http://e-learningman2wonosobo.my.id/__statics/gudangsoal/files/robux-win_GM431946152.pdfIn PDF document text
- http://e-learningman2wonosobo.my.id/__statics/gudangsoal/files/free-robux-websites-2021_GM431946152.pdfIn PDF document text
- http://e-learningman2wonosobo.my.id/__statics/gudangsoal/files/coin-master-hack-without-verification-code_GM406889139.pdfIn PDF document text
- http://e-learningman2wonosobo.my.id/__statics/gudangsoal/files/how-to-get-free-shirts-on-roblox-no-hacks_GM431946152.pdfIn PDF document text
- http://e-learningman2wonosobo.my.id/__statics/gudangsoal/files/mcpe-master-hack-unlimited-coins-apk_GM406889139.pdfIn PDF document text
- http://e-learningman2wonosobo.my.id/__statics/gudangsoal/files/how-do-you-get-free-daily-spins-on-coin-master_GM406889139.pdfIn PDF document text
- http://e-learningman2wonosobo.my.id/__statics/gudangsoal/files/free-robux-script-tampermonkey-legit-works-no-scam-100_GM431946152.pdfIn PDF document text
- http://e-learningman2wonosobo.my.id/__statics/gudangsoal/files/coin-master-map_GM406889139.pdfIn PDF document text
- http://e-learningman2wonosobo.my.id/__statics/gudangsoal/files/www-mistplay-com-free-robux_GM431946152.pdfIn PDF document text
- http://e-learningman2wonosobo.my.id/__statics/gudangsoal/files/coin-master-free-gifts_GM406889139.pdfIn PDF document text
- http://e-learningman2wonosobo.my.id/__statics/gudangsoal/files/roblox-on-switch-is-it-free_GM431946152.pdfIn PDF document text
- http://e-learningman2wonosobo.my.id/__statics/gudangsoal/files/citizen-hacks-roblox_GM431946152.pdfIn PDF document text
- http://e-learningman2wonosobo.my.id/__statics/gudangsoal/files/cheat-engine-on-roblox-2021_GM431946152.pdfIn PDF document text
- http://e-learningman2wonosobo.my.id/__statics/gudangsoal/files/coin-master-free-spins-daily-1-ga_GM406889139.pdfIn PDF document text
- http://e-learningman2wonosobo.my.id/__statics/gudangsoal/files/rbxfree-com-free-robux_GM431946152.pdfIn PDF document text
- http://e-learningman2wonosobo.my.id/__statics/gudangsoal/files/how-to-get-a-free-minecraft-server_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_off00003274.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x3274	22576 bytes
SHA-256: `a630f0fe1a73469af749e9836bd10beb69091ce1a0ba0f033d0df1bcd7c8b16c`
`font_01_sfnt_off000064f3.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x64F3	19428 bytes
SHA-256: `6c1a5b624a84b2f7bc9c206b3657e31878d9065c8b01b8732ae124258ddd6011`

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