PDF malware analysis — malicious · 9cce4fe7f09bcf59

MALICIOUS

PDF

46.6 KB Created: 2021-05-15 14:00:25 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-24

MD5: f04c08f343e008ac29d791ed07686077 SHA-1: 49682b720452a470d77f8333d22031823ae3dbb3 SHA-256: 9cce4fe7f09bcf597373e591ab19771c8d8500b10d9f42f020b34e0d94600ccd

180 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a malformed stream and links to known malicious redirector infrastructure, specifically a lure for 'free spins' and 'game hacks'. The ML classifier also flagged this PDF as malicious. The primary IOC is the redirector URL, which likely leads to further malicious content or credential harvesting pages.

Machine Learning

Nyx PDF Classifier malicious score 0.8948

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 https://netcdn.xyz/app/406889139/daily-free-spins-coin-master-2021-game-hack In PDF document text
- https://e-learning.mtsn7kediri.sch.id/__statics/gudangsoal/files/coin-master-today_GM406889139.pdfIn PDF document text
- https://e-learning.mtsn7kediri.sch.id/__statics/gudangsoal/files/roblox-fun-com-robux_GM431946152.pdfIn PDF document text
- https://e-learning.mtsn7kediri.sch.id/__statics/gudangsoal/files/coin-master-free-spins-save_GM406889139.pdfIn PDF document text
- http://e-learning.mtsn7kediri.sch.id/__statics/gudangsoal/files/coin-master-daily-bonus_GM406889139.pdfIn PDF document text
- http://e-learning.mtsn7kediri.sch.id/__statics/gudangsoal/files/coin-master-free-coins-link-2021-today_GM406889139.pdfIn PDF document text
- https://e-learning.mtsn7kediri.sch.id/__statics/gudangsoal/files/rbxoffer-com-free-robux_GM431946152.pdfIn PDF document text
- https://e-learning.mtsn7kediri.sch.id/__statics/gudangsoal/files/minecraft-java-hacks_GM479516143.pdfIn PDF document text
- https://e-learning.mtsn7kediri.sch.id/__statics/gudangsoal/files/roblox-www-com_GM431946152.pdfIn PDF document text
- https://e-learning.mtsn7kediri.sch.id/__statics/gudangsoal/files/coin-master-hack-mod-apk-download_GM406889139.pdfIn PDF document text
- https://e-learning.mtsn7kediri.sch.id/__statics/gudangsoal/files/how-to-hack-someone-on-roblox_GM431946152.pdfIn PDF document text
- http://e-learning.mtsn7kediri.sch.id/__statics/gudangsoal/files/coin-master-hack-apk-android_GM406889139.pdfIn PDF document text
- https://e-learning.mtsn7kediri.sch.id/__statics/gudangsoal/files/free-coin-master-hacks-no-verification-or-survey_GM406889139.pdfIn PDF document text
- https://e-learning.mtsn7kediri.sch.id/__statics/gudangsoal/files/free-spins-coin-master-2021-glitch_GM406889139.pdfIn PDF document text
- https://e-learning.mtsn7kediri.sch.id/__statics/gudangsoal/files/rbx-com_GM431946152.pdfIn PDF document text
- https://e-learning.mtsn7kediri.sch.id/__statics/gudangsoal/files/free-google-play-promo-codes-coin-master_GM406889139.pdfIn PDF document text
- https://e-learning.mtsn7kediri.sch.id/__statics/gudangsoal/files/how-to-hack-in-arsenal_GM431946152.pdfIn PDF document text
- https://e-learning.mtsn7kediri.sch.id/__statics/gudangsoal/files/twitter-coin-master-free-spins-link_GM406889139.pdfIn PDF document text
- http://e-learning.mtsn7kediri.sch.id/__statics/gudangsoal/files/coin-master-free-spins-for-iphone_GM406889139.pdfIn PDF document text
- https://e-learning.mtsn7kediri.sch.id/__statics/gudangsoal/files/minecraft-xbox-free_GM479516143.pdfIn PDF document text
- https://e-learning.mtsn7kediri.sch.id/__statics/gudangsoal/files/free-robux-earn_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_003_off00004ac6.bin`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x4AC6	30148 bytes
SHA-256: `505204168b6905c0bacaf0438e369405ef2a5c8a261301dfeb03ffbc65b9ff12`
`font_01_sfnt_off000088a0.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x88A0	2840 bytes
SHA-256: `3fb127b764b9d10f5525bc4de5ec8316de704409ccb0cf21cff3ad8a30d11676`
`font_02_sfnt_off00009252.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x9252	18708 bytes
SHA-256: `76af36f54327e394f6a0995f5c1804c6d580e71cb7eebf938ec25838add40309`

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