PDF malware analysis — malicious · 1dcb4e36429c6201

MALICIOUS

PDF

45.2 KB Created: 2021-05-13 15:32:15 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-25

MD5: f04bac83083493a77daaa7fee4180afc SHA-1: 93826ccda4dedc84313783779dc4d20c53c8f186 SHA-256: 1dcb4e36429c6201cd431de6b880009cb69a8de92f987281219336f5d62f54d8

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 0.9621

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-no-download-game-hack PDF link annotation
- http://installer-m.ru/images/coin-master-free-spins-and-free-coins_GM406889139.pdfIn PDF document text
- http://installer-m.ru/images/games-that-give-free-robux_GM431946152.pdfIn PDF document text
- http://installer-m.ru/images/master-coin-master-free-spin_GM406889139.pdfIn PDF document text
- http://installer-m.ru/images/best-site-for-free-coin-master-free-spins_GM406889139.pdfIn PDF document text
- http://installer-m.ru/images/free-spin-link-of-coin-master_GM406889139.pdfIn PDF document text
- http://installer-m.ru/images/minecraft-skins-download-free_GM479516143.pdfIn PDF document text
- http://installer-m.ru/images/coin-master-free-coins-and-spins-link_GM406889139.pdfIn PDF document text
- http://installer-m.ru/images/minecraft-pocket-edition-mods-for-free_GM479516143.pdfIn PDF document text
- http://installer-m.ru/images/free-modded-minecraft-server_GM479516143.pdfIn PDF document text
- http://installer-m.ru/images/coin-master-free-spins-link-october-2021_GM406889139.pdfIn PDF document text
- http://installer-m.ru/images/roblox-arsenal-hack_GM431946152.pdfIn PDF document text
- http://installer-m.ru/images/free-roblox-hair-codes_GM431946152.pdfIn PDF document text
- http://installer-m.ru/images/village-4-coin-master_GM406889139.pdfIn PDF document text
- http://installer-m.ru/images/free-robux-real-2021_GM431946152.pdfIn PDF document text
- http://installer-m.ru/images/free-roebucks-no-human-verification_GM431946152.pdfIn PDF document text
- http://installer-m.ru/images/minecraft-hacks-18-9_GM479516143.pdfIn PDF document text
- http://installer-m.ru/images/coin-master-free-spin-link-app_GM406889139.pdfIn PDF document text
- http://installer-m.ru/images/www-roblox-robux_GM431946152.pdfIn PDF document text
- http://installer-m.ru/images/my-roblox-account-was-hacked_GM431946152.pdfIn PDF document text
- http://installer-m.ru/images/free-coin-master-spins-2021_GM406889139.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_off00004770.bin`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x4770	25312 bytes
SHA-256: `18a35c8afdf858fde39ee50cd9b571a6627948939f5583830dc074314656edce`
`font_01_sfnt_off000081f8.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x81F8	3044 bytes
SHA-256: `93851eeb806d3025a8b1b6b1bfec2b295747015d1373ac8385966112bbd16bef`
`font_02_sfnt_off00008c63.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x8C63	18824 bytes
SHA-256: `a83584a15d83770571e134086905248a9fe783ccc3b424d06d308178a7ec7f42`

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