PDF malware analysis — malicious · 909b5a380ef1461c

MALICIOUS

PDF

48.3 KB Created: 2021-05-12 16:01:55 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-04

MD5: 55c2208af3bbe4fd0a76bf7f5ee6c1cc SHA-1: e122939a052be869a37b663c33663ad7a5b3c89f SHA-256: 909b5a380ef1461ceef5ad10398c91bea98f979ef9689bb36a4f91d3c5218da7

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 0.9013

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.xyz/app/431946152/free-robux-codes-2021-game-hack PDF link annotation
- http://greasley.website/images/hack-coin-master-1_GM406889139.pdfIn PDF document text
- http://greasley.website/images/best-minecraft-hacked-client-2021_GM479516143.pdfIn PDF document text
- http://greasley.website/images/can-u-get-free-robux_GM431946152.pdfIn PDF document text
- http://greasley.website/images/coin-master-tricks_GM406889139.pdfIn PDF document text
- http://greasley.website/images/free-minecraft-account-and-password_GM479516143.pdfIn PDF document text
- http://greasley.website/images/coin-master-free-spinv1-0apkpure-com-apk_GM406889139.pdfIn PDF document text
- http://greasley.website/images/free-coin-link-coin-master_GM406889139.pdfIn PDF document text
- http://greasley.website/images/coin-master-free-spins-link-blogspot_GM406889139.pdfIn PDF document text
- http://greasley.website/images/online-hacking-tricks-coin-master_GM406889139.pdfIn PDF document text
- http://greasley.website/images/lots-of-robux_GM431946152.pdfIn PDF document text
- http://greasley.website/images/microsoft-rewards-roblox_GM431946152.pdfIn PDF document text
- http://greasley.website/images/how-long-is-the-minecraft-free-trial_GM479516143.pdfIn PDF document text
- http://greasley.website/images/coin-master-free-spin-codes_GM406889139.pdfIn PDF document text
- http://greasley.website/images/coin-master-email-free-spins_GM406889139.pdfIn PDF document text
- http://greasley.website/images/100-free-spins-for-coin-master_GM406889139.pdfIn PDF document text
- http://greasley.website/images/how-to-get-free-spins-in-coin-master_GM406889139.pdfIn PDF document text
- http://greasley.website/images/coin-master-daily-free-spins-and-coins_GM406889139.pdfIn PDF document text
- http://greasley.website/images/minecraft-that-you-can-play-for-free_GM479516143.pdfIn PDF document text
- http://greasley.website/images/free-robux-gen_GM431946152.pdfIn PDF document text
- http://greasley.website/images/how-to-make-a-minecraft-java-server-for-free_GM479516143.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
`stream_003_off00004be5.bin`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x4BE5	27400 bytes
SHA-256: `f1f405a75684f06dd87f952fa4ea9bb4c5257a685dee040c0e959368d1797664`
`font_01_sfnt_off00008c2f.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x8C2F	5696 bytes
SHA-256: `450e3ee45915afe13702bf1d587eb8b9ad88a8d2113419ac9f2fd116a828e139`
`font_02_sfnt_off00009940.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x9940	18588 bytes
SHA-256: `0c0011b59677f21f59199ad7d2a82948105ed154610022cedcbab6f052c91d55`

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