PDF malware analysis — malicious · e5183f52f4b3ce06

MALICIOUS

PDF

50.4 KB Created: 2021-06-03 15:52:43 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-25

MD5: 31033d80214ac3320707918135aa68d2 SHA-1: 1a180986c6ecabf9c80d72c7d1e920772b56a2db SHA-256: e5183f52f4b3ce069a49622385819f8b86fafad752a6545b631806b8943bf83d

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 0.9769

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.online/app/431946152/www-free-robux-com-game-hack PDF link annotation
- https://www.themerchantshouse.co.uk/uploads/files/files/jailbreak-script_GM431946152.pdfIn PDF document text
- https://www.themerchantshouse.co.uk/uploads/files/files/ways-to-get-free-robux-2021_GM431946152.pdfIn PDF document text
- https://www.themerchantshouse.co.uk/uploads/files/files/how-to-get-free-robux-games_GM431946152.pdfIn PDF document text
- https://www.themerchantshouse.co.uk/uploads/files/files/hack-coin-master-apk-31_GM406889139.pdfIn PDF document text
- https://www.themerchantshouse.co.uk/uploads/files/files/coin-master-free-daily-rewards_GM406889139.pdfIn PDF document text
- https://www.themerchantshouse.co.uk/uploads/files/files/roblox-hacked-com-2021_GM431946152.pdfIn PDF document text
- https://www.themerchantshouse.co.uk/uploads/files/files/free-spins-coin-master-daily_GM406889139.pdfIn PDF document text
- https://www.themerchantshouse.co.uk/uploads/files/files/free-robux-com-no-verification_GM431946152.pdfIn PDF document text
- https://www.themerchantshouse.co.uk/uploads/files/files/free-roblox-accounts-with-robux-that-work-2021_GM431946152.pdfIn PDF document text
- https://www.themerchantshouse.co.uk/uploads/files/files/roblox-script-hack_GM431946152.pdfIn PDF document text
- https://www.themerchantshouse.co.uk/uploads/files/files/roblox-robux-generator-2021_GM431946152.pdfIn PDF document text
- https://www.themerchantshouse.co.uk/uploads/files/files/free-robux-hack-no-human-verification_GM431946152.pdfIn PDF document text
- https://www.themerchantshouse.co.uk/uploads/files/files/moonactive-coin-master-free-spins-link_GM406889139.pdfIn PDF document text
- https://www.themerchantshouse.co.uk/uploads/files/files/what-do-roblox-points-do_GM431946152.pdfIn PDF document text
- https://www.themerchantshouse.co.uk/uploads/files/files/free-robux-without-doing-anything_GM431946152.pdfIn PDF document text
- https://www.themerchantshouse.co.uk/uploads/files/files/free-role-in-coin-master_GM406889139.pdfIn PDF document text
- https://www.themerchantshouse.co.uk/uploads/files/files/www-roblox-com-robux-free_GM431946152.pdfIn PDF document text
- https://www.themerchantshouse.co.uk/uploads/files/files/how-to-get-free-robux-without-verification_GM431946152.pdfIn PDF document text
- https://www.themerchantshouse.co.uk/uploads/files/files/how-to-get-free-robux-2021_GM431946152.pdfIn PDF document text
- https://www.themerchantshouse.co.uk/uploads/files/files/minecraft-iphone-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_004_off0000536a.bin`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x536A	29508 bytes
SHA-256: `713938e57a20794ad92795e68c30a73562eeebe4e119b1d8af318101d7c7f01a`
`font_01_sfnt_off000094b3.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x94B3	3884 bytes
SHA-256: `40b61f8938bd710dc29dc58ba3fde91c245a6a69596ec569b4d27c769ca417cf`
`font_02_sfnt_off0000a15a.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xA15A	18636 bytes
SHA-256: `9f7262e815bd0044d2d3715e2ef4b4760a787eb7fc9de28673ce11fb32ae2f7d`

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