PDF malware analysis — malicious · 4a9043b6aa5d56b1

MALICIOUS

PDF

33.5 KB Created: 2021-06-17 17:21:28 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-25

MD5: 17ab306d4c5a76cfea0103e923cb685c SHA-1: d64057378c0a019515fa848f97b8c6edf1af8165 SHA-256: 4a9043b6aa5d56b1ab68f1734fdcd58105f71d1330818e3a6a87615fee0945a4

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.co/app/431946152/hacks-roblox-lumber-tycoon-game-hack PDF link annotation
- https://www.astrospace.com.tw/upload/files/mad-city-roblox-hack-saison-4_GM431946152.pdfIn PDF document text
- https://www.astrospace.com.tw/upload/files/free-robux-with-developer-tools_GM431946152.pdfIn PDF document text
- https://www.astrospace.com.tw/upload/files/oprewards-free-robux_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/coin-master-daily-bonus-hack_GM406889139.pdfIn PDF document text
- https://www.astrospace.com.tw/upload/files/how-to-hack-a-roblox-account-2021_GM431946152.pdfIn PDF document text
- https://www.astrospace.com.tw/upload/files/how-to-get-free-spins-in-coin-master-2021_GM406889139.pdfIn PDF document text
- https://www.astrospace.com.tw/upload/files/who-type-of-roblox-hack-is-the-best_GM431946152.pdfIn PDF document text
- https://www.astrospace.com.tw/upload/files/legit-free-spins-coin-master_GM406889139.pdfIn PDF document text
- https://www.astrospace.com.tw/upload/files/free-robux-pastebin_GM431946152.pdfIn PDF document text
- https://www.astrospace.com.tw/upload/files/how-to-get-free-robux-without-surveys_GM431946152.pdfIn PDF document text
- https://www.astrospace.com.tw/upload/files/free-roblox-codes-2021_GM431946152.pdfIn PDF document text
- https://www.astrospace.com.tw/upload/files/robux-generator-no-human-verification_GM431946152.pdfIn PDF document text
- https://www.astrospace.com.tw/upload/files/free-robux-generator-com-roblox-hack_GM431946152.pdfIn PDF document text
- https://www.astrospace.com.tw/upload/files/free-clothing-on-roblox_GM431946152.pdfIn PDF document text
- https://www.astrospace.com.tw/upload/files/how-to-get-coins-on-tiktok-for-free_GM835599320.pdfIn PDF document text
- https://www.astrospace.com.tw/upload/files/roblox-hacks-2021_GM431946152.pdfIn PDF document text
- https://www.astrospace.com.tw/upload/files/how-to-get-free-robux-hack-2021_GM431946152.pdfIn PDF document text
- https://www.astrospace.com.tw/upload/files/free-minecraft-account-reddit_GM479516143.pdfIn PDF document text
- https://www.astrospace.com.tw/upload/files/mine-minecraft-games-for-free_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_off00002e34.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x2E34	21560 bytes
SHA-256: `2e5416f3afbad58a42b04c33de8824b78f7eecc404cb67d5bf3ed0f29c84c72f`
`font_01_sfnt_off00005da1.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x5DA1	19052 bytes
SHA-256: `f5326461626100346dc332216215fc300d61efc641573fd64cc5b5edf9e6a172`

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