PDF malware analysis — malicious · 42e3d9bc4784e6f3

MALICIOUS

PDF

51.5 KB Created: 2021-06-08 22:20:45 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-25

MD5: da54cfac453c87ee0a3de87abfea7220 SHA-1: 106995fd88c5411ac966b8af83da691894fad73a SHA-256: 42e3d9bc4784e6f30366e362c34c486b94a9d2c5978be6f39077857eee6faef7

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 0.9685

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 https://netcdn.tw/app/431946152/veste-free-game-roblox-game-hack PDF link annotation
- https://bibliopolis.be/wp-content/uploads/fsqm-files/rxfastml-free-robux-generator_GM431946152.pdfIn PDF document text
- https://bibliopolis.be/wp-content/uploads/fsqm-files/how-to-hack-your-friends-roblox-account-on-ipad_GM431946152.pdfIn PDF document text
- https://bibliopolis.be/wp-content/uploads/fsqm-files/free-spins-for-coin-master_GM406889139.pdfIn PDF document text
- https://bibliopolis.be/wp-content/uploads/fsqm-files/robux-codes-unused-free-robux_GM431946152.pdfIn PDF document text
- https://bibliopolis.be/wp-content/uploads/fsqm-files/how-to-hack-roblox-on-chromebook_GM431946152.pdfIn PDF document text
- https://bibliopolis.be/wp-content/uploads/fsqm-files/cringe-guys-trying-to-have-free-robux_GM431946152.pdfIn PDF document text
- https://bibliopolis.be/wp-content/uploads/fsqm-files/how-can-i-get-free-robux-without-doing-anything_GM431946152.pdfIn PDF document text
- https://bibliopolis.be/wp-content/uploads/fsqm-files/free-shirts-on-roblox-2021_GM431946152.pdfIn PDF document text
- https://bibliopolis.be/wp-content/uploads/fsqm-files/roblox-fun-hack_GM431946152.pdfIn PDF document text
- https://bibliopolis.be/wp-content/uploads/fsqm-files/robux-hack-no-app-download_GM431946152.pdfIn PDF document text
- https://bibliopolis.be/wp-content/uploads/fsqm-files/minecraft-free-no-download_GM479516143.pdfIn PDF document text
- https://bibliopolis.be/wp-content/uploads/fsqm-files/hack-de-roblox-para-alas-gratis_GM431946152.pdfIn PDF document text
- https://bibliopolis.be/wp-content/uploads/fsqm-files/cheats-for-elemental-battlegrounds-roblox_GM431946152.pdfIn PDF document text
- https://bibliopolis.be/wp-content/uploads/fsqm-files/how-to-get-money-for-free-on-roblox_GM431946152.pdfIn PDF document text
- https://bibliopolis.be/wp-content/uploads/fsqm-files/how-you-get-free-robux_GM431946152.pdfIn PDF document text
- https://bibliopolis.be/wp-content/uploads/fsqm-files/unlimited-robux-hack-for-computer_GM431946152.pdfIn PDF document text
- https://bibliopolis.be/wp-content/uploads/fsqm-files/free-minecraft-servers-to-join_GM479516143.pdfIn PDF document text
- https://bibliopolis.be/wp-content/uploads/fsqm-files/roblox-hack-and-cheats-for-exploit-free-download_GM431946152.pdfIn PDF document text
- https://bibliopolis.be/wp-content/uploads/fsqm-files/coin-master-free-spins-and-coins_GM406889139.pdfIn PDF document text
- https://bibliopolis.be/wp-content/uploads/fsqm-files/roblox-hack-robux-hack-no-human-verification_GM431946152.pdfIn PDF document text
- http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off00005471.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x5471	25272 bytes
SHA-256: `68503e7a958f29845b96243afe215ed1a8dafe4c217d99e6e518f49804e02c1a`
`font_01_sfnt_off00008e77.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x8E77	2824 bytes
SHA-256: `94c1b019735d7e491765340abe50b2897410e2ec65ecf141c08bd9f2220897c4`
`font_02_sfnt_off00009820.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x9820	5696 bytes
SHA-256: `450e3ee45915afe13702bf1d587eb8b9ad88a8d2113419ac9f2fd116a828e139`
`font_03_sfnt_off0000a531.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xA531	18672 bytes
SHA-256: `fb97ff36d2c5131e0fd05c1767d27cd37cb451caeb046968a6de3cab69bb202b`

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