PDF malware analysis — malicious · d7fdcb2a126b3461

MALICIOUS

PDF

35.3 KB Created: 2021-07-04 04:11:29 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-25

MD5: 1ae5272d47d2b574460ce6e0bb975913 SHA-1: dbdb72d2bbb41a37dab266941fef3be6dacf7092 SHA-256: d7fdcb2a126b3461dce5c532f44732261418f48414cddc982ba35e06eeed8e22

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/431946152/can-i-play-roblox-for-free-game-hack PDF link annotation
- https://www.astrospace.com.tw/upload/files/coin-master-rewards-free-spins_GM406889139.pdfIn PDF document text
- https://www.astrospace.com.tw/upload/files/daily-free-spin-coin-master-link_GM406889139.pdfIn PDF document text
- https://www.astrospace.com.tw/upload/files/coin-master-free-spins-twitter_GM406889139.pdfIn PDF document text
- https://www.astrospace.com.tw/upload/files/free-roblox-cards-no-survey_GM431946152.pdfIn PDF document text
- https://www.astrospace.com.tw/upload/files/minecraft-fly-hack_GM479516143.pdfIn PDF document text
- https://www.astrospace.com.tw/upload/files/free-promocodes-working-on-roblox_GM431946152.pdfIn PDF document text
- https://www.astrospace.com.tw/upload/files/notepad-hack-roblox-download_GM431946152.pdfIn PDF document text
- https://www.astrospace.com.tw/upload/files/is-there-any-way-to-get-free-robux_GM431946152.pdfIn PDF document text
- https://www.astrospace.com.tw/upload/files/how-do-u-speed-hack-in-mm2-roblox_GM431946152.pdfIn PDF document text
- https://www.astrospace.com.tw/upload/files/coin-master-official-fan-page_GM406889139.pdfIn PDF document text
- https://www.astrospace.com.tw/upload/files/how-to-make-a-minecraft-server-for-free-java_GM479516143.pdfIn PDF document text
- https://www.astrospace.com.tw/upload/files/how-to-get-free-robux-on-xbox-1_GM431946152.pdfIn PDF document text
- https://www.astrospace.com.tw/upload/files/free-coins-for-coin-master_GM406889139.pdfIn PDF document text
- https://www.astrospace.com.tw/upload/files/coin-master-free-spins-link-today-instagram_GM406889139.pdfIn PDF document text
- https://www.astrospace.com.tw/upload/files/free-coins-and-free-spins-coin-master-2021_GM406889139.pdfIn PDF document text
- https://www.astrospace.com.tw/upload/files/roblox-cheat-engine-64-money-hack_GM431946152.pdfIn PDF document text
- https://www.astrospace.com.tw/upload/files/coin-master-3533-android-hack_GM406889139.pdfIn PDF document text
- https://www.astrospace.com.tw/upload/files/tiktok-followers-free-no-verification_GM835599320.pdfIn PDF document text
- https://www.astrospace.com.tw/upload/files/april-fools-roblox-hacking-date_GM431946152.pdfIn PDF document text
- https://www.astrospace.com.tw/upload/files/get-roblox-free-online_GM431946152.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_off00003280.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x3280	22644 bytes
SHA-256: `cbc23b6c99e2927fcfb25c4fc5e0d486f621bb288fb02ac3e712c5bf1400ca1c`
`font_01_sfnt_off0000653c.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x653C	18984 bytes
SHA-256: `60c174e6a9acb6eaf6d75ac86851b75746a9043d08d3bbe18dd212e8d0b2f632`

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