PDF malware analysis — malicious · b663bf1792d13925

MALICIOUS

PDF

46.4 KB Created: 2021-05-14 16:32:28 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-25

MD5: c7f389ec704021c859a72e6ae04cee21 SHA-1: daf1b963c45cff0abf275b5fb2717f295d023f65 SHA-256: b663bf1792d13925a4e243558b3c216e76a1331bb2983f4fd8808deba7e46819

182 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF document was flagged as malicious by an ML classifier. It uses a fake-CAPTCHA lure. 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 0.8948

Heuristics 6

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.
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
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 https://netcdn.xyz/app/479516143/play-minecraft-for-free-game-hack PDF link annotation
- https://elearningmts.alhidayahwanti.sch.id/__statics/gudangsoal/files/how-to-get-robux-for-free-2021_GM431946152.pdfIn PDF document text
- https://elearningmts.alhidayahwanti.sch.id/__statics/gudangsoal/files/coin-master-free-coins-today_GM406889139.pdfIn PDF document text
- https://elearningmts.alhidayahwanti.sch.id/__statics/gudangsoal/files/how-to-get-free-chest-in-coin-master_GM406889139.pdfIn PDF document text
- https://elearningmts.alhidayahwanti.sch.id/__statics/gudangsoal/files/robux-without-verification_GM431946152.pdfIn PDF document text
- https://elearningmts.alhidayahwanti.sch.id/__statics/gudangsoal/files/roblox-games-that-give-you-free-robux_GM431946152.pdfIn PDF document text
- https://elearningmts.alhidayahwanti.sch.id/__statics/gudangsoal/files/how-to-get-spins-for-free-on-coin-master_GM406889139.pdfIn PDF document text
- https://elearningmts.alhidayahwanti.sch.id/__statics/gudangsoal/files/hack-client_GM479516143.pdfIn PDF document text
- https://elearningmts.alhidayahwanti.sch.id/__statics/gudangsoal/files/mcpe-116_GM479516143.pdfIn PDF document text
- https://elearningmts.alhidayahwanti.sch.id/__statics/gudangsoal/files/spin-link_GM406889139.pdfIn PDF document text
- https://elearningmts.alhidayahwanti.sch.id/__statics/gudangsoal/files/how-to-hack-coin-master-pc_GM406889139.pdfIn PDF document text
- https://elearningmts.alhidayahwanti.sch.id/__statics/gudangsoal/files/classic-minecraft-net-hacks_GM479516143.pdfIn PDF document text
- https://elearningmts.alhidayahwanti.sch.id/__statics/gudangsoal/files/how-to-get-unlimited-robux_GM431946152.pdfIn PDF document text
- https://elearningmts.alhidayahwanti.sch.id/__statics/gudangsoal/files/daily-coin-master-link_GM406889139.pdfIn PDF document text
- https://elearningmts.alhidayahwanti.sch.id/__statics/gudangsoal/files/daily-coin-master-free-spin-link_GM406889139.pdfIn PDF document text
- https://elearningmts.alhidayahwanti.sch.id/__statics/gudangsoal/files/how-do-u-hack-roblox_GM431946152.pdfIn PDF document text
- https://elearningmts.alhidayahwanti.sch.id/__statics/gudangsoal/files/free-spin-coin-master-today_GM406889139.pdfIn PDF document text
- https://elearningmts.alhidayahwanti.sch.id/__statics/gudangsoal/files/free-minecraft-accounts-reddit_GM479516143.pdfIn PDF document text
- https://elearningmts.alhidayahwanti.sch.id/__statics/gudangsoal/files/how-to-hack-roblox-to-get-free-robux_GM431946152.pdfIn PDF document text
- https://elearningmts.alhidayahwanti.sch.id/__statics/gudangsoal/files/how-to-get-minecraft-for-free-on-android-device_GM479516143.pdfIn PDF document text
- https://elearningmts.alhidayahwanti.sch.id/__statics/gudangsoal/files/coin-master-free-spins-link-march-2021_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
`font_00_sfnt_off00005167.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x5167	24808 bytes
SHA-256: `e3d254475335a94c470754b7798a28a92ab1b54042df43f9eb4261a90d3cd40e`
`font_01_sfnt_off0000898c.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x898C	2880 bytes
SHA-256: `10d025f04f706eb71cdda4f99784df1b9ccb52e48080e43095e0398eaef6f132`
`font_02_sfnt_off00009377.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x9377	18116 bytes
SHA-256: `58506b39f0592aa293a22e76cdd5d8324130a94bf097dc81d26ff216ea8060f4`

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