PDF malware analysis — malicious · a0964ac3ed58b512

MALICIOUS

PDF

35.7 KB Created: 2021-07-04 17:25:51 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-04

MD5: 9c4574b6cc30a51d9e857f37d214eede SHA-1: 91f9611afac4de1cc0173fca69589669f421a396 SHA-256: a0964ac3ed58b51220fcabd346d65f06c4da0d0e158b9605d5e7fb52bc0d5629

142 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, routes users through malicious redirector infrastructure and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

Nyx PDF Classifier malicious score 0.9980

Heuristics 5

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.
PDF links to a 'free generator / game hack' redirector high 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.
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
External URI info PDF_URI

PDF contains an external URL action
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/406889139/coin-master-spin-link-today-2021-game-hack PDF link annotation
- https://elerning.mtsn1lampungtimur.com/__statics/gudangsoal/files/hack-para-dragon-ball-super-heroes-roblox_GM431946152.pdfIn PDF document text
- https://elerning.mtsn1lampungtimur.com/__statics/gudangsoal/files/uprobuxcom-free-robux_GM431946152.pdfIn PDF document text
- https://elerning.mtsn1lampungtimur.com/__statics/gudangsoal/files/public-enemy-sun-prairie-coin-master-free-spins_GM406889139.pdfIn PDF document text
- https://elerning.mtsn1lampungtimur.com/__statics/gudangsoal/files/apk-roblox-hack-games_GM431946152.pdfIn PDF document text
- https://elerning.mtsn1lampungtimur.com/__statics/gudangsoal/files/free-robux-generator-without-human-verification_GM431946152.pdfIn PDF document text
- https://elerning.mtsn1lampungtimur.com/__statics/gudangsoal/files/free-coin-master-spins-2021_GM406889139.pdfIn PDF document text
- https://elerning.mtsn1lampungtimur.com/__statics/gudangsoal/files/coin-master-free-spins-and-coins-2021_GM406889139.pdfIn PDF document text
- https://elerning.mtsn1lampungtimur.com/__statics/gudangsoal/files/coin-master-free-spins-and-coins-daily_GM406889139.pdfIn PDF document text
- https://elerning.mtsn1lampungtimur.com/__statics/gudangsoal/files/google-coin-master-free-spins_GM406889139.pdfIn PDF document text
- https://elerning.mtsn1lampungtimur.com/__statics/gudangsoal/files/roblox-robux-generator_GM431946152.pdfIn PDF document text
- https://elerning.mtsn1lampungtimur.com/__statics/gudangsoal/files/robux-free-c_GM431946152.pdfIn PDF document text
- https://elerning.mtsn1lampungtimur.com/__statics/gudangsoal/files/coin-master-hack-apk-2021-ios_GM406889139.pdfIn PDF document text
- https://elerning.mtsn1lampungtimur.com/__statics/gudangsoal/files/free-robux-no-human-verification-generator_GM431946152.pdfIn PDF document text
- https://elerning.mtsn1lampungtimur.com/__statics/gudangsoal/files/free-spins-coin-master-links-2021_GM406889139.pdfIn PDF document text
- https://elerning.mtsn1lampungtimur.com/__statics/gudangsoal/files/free-robux-generator-no-human-verification-2021_GM431946152.pdfIn PDF document text
- https://elerning.mtsn1lampungtimur.com/__statics/gudangsoal/files/_GM479516143.pdfIn PDF document text
- https://elerning.mtsn1lampungtimur.com/__statics/gudangsoal/files/free-coins-on-coin-master_GM406889139.pdfIn PDF document text
- https://elerning.mtsn1lampungtimur.com/__statics/gudangsoal/files/how-to-get-free-robux-without-verification-or-surveys_GM431946152.pdfIn PDF document text
- https://elerning.mtsn1lampungtimur.com/__statics/gudangsoal/files/how-to-hack-roblox-on-mobile_GM431946152.pdfIn PDF document text
- https://elerning.mtsn1lampungtimur.com/__statics/gudangsoal/files/pokemon-go-free-walk-android_GM1094591345.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
`stream_002_off0000320a.bin`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x320A	23324 bytes
SHA-256: `c07e80ee64357d3a53edf02941a103b68cbb617d668bb50c22dc568e10a7dd2a`
`font_01_sfnt_off00006696.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x6696	18936 bytes
SHA-256: `aefd4c8aa672ac6796493a30dc30ef33cbc4fc7ade9b0201b27009014c0c0cd8`

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