PDF malware analysis — malicious · bc78602e35ec6e08

MALICIOUS

PDF

53.8 KB Created: 2021-06-03 18:18:56 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-25

MD5: 88b8b12f7a110ad56c4105b2dc6679d9 SHA-1: 1a495ebe70061240ee9536ed9554157e36ddf6ec SHA-256: bc78602e35ec6e08824351d52dc335ffd3c14d0548d8dcd42af3852af84ace30

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 0.9636

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/robux-scam-game-hack PDF link annotation
- https://www.talakeel.com/uploaded_files/userfiles/files/free-spins-coin-master-hack-2021_GM406889139.pdfIn PDF document text
- https://www.talakeel.com/uploaded_files/userfiles/files/coin-master-link_GM406889139.pdfIn PDF document text
- https://www.talakeel.com/uploaded_files/userfiles/files/how-do-you-get-free-robux-without-doing-anything_GM431946152.pdfIn PDF document text
- https://www.talakeel.com/uploaded_files/userfiles/files/how-to-get-free-robux-2021-easy_GM431946152.pdfIn PDF document text
- https://www.talakeel.com/uploaded_files/userfiles/files/minecraft-115-2-hacks_GM479516143.pdfIn PDF document text
- https://www.talakeel.com/uploaded_files/userfiles/files/free-robux-hack-no-human-verification-or-survey_GM431946152.pdfIn PDF document text
- https://www.talakeel.com/uploaded_files/userfiles/files/best-free-spins-link-coin-master_GM406889139.pdfIn PDF document text
- https://www.talakeel.com/uploaded_files/userfiles/files/how-to-hack-someone-on-roblox_GM431946152.pdfIn PDF document text
- https://www.talakeel.com/uploaded_files/userfiles/files/coin-master-tricks_GM406889139.pdfIn PDF document text
- https://www.talakeel.com/uploaded_files/userfiles/files/100-free-spins-coin-master-2021_GM406889139.pdfIn PDF document text
- https://www.talakeel.com/uploaded_files/userfiles/files/bad-minecraft-free_GM479516143.pdfIn PDF document text
- https://www.talakeel.com/uploaded_files/userfiles/files/coin-master-tiradas-gratis_GM406889139.pdfIn PDF document text
- https://www.talakeel.com/uploaded_files/userfiles/files/coin-master-hack-app-ios_GM406889139.pdfIn PDF document text
- https://www.talakeel.com/uploaded_files/userfiles/files/free-promo-codes-for-robux_GM431946152.pdfIn PDF document text
- https://www.talakeel.com/uploaded_files/userfiles/files/coin-master-free-spins-1-coin-master_GM406889139.pdfIn PDF document text
- https://www.talakeel.com/uploaded_files/userfiles/files/roblox-free-robux-com_GM431946152.pdfIn PDF document text
- https://www.talakeel.com/uploaded_files/userfiles/files/free-robux-generator-no-survey_GM431946152.pdfIn PDF document text
- https://www.talakeel.com/uploaded_files/userfiles/files/how-to-hack-coin-master-root_GM406889139.pdfIn PDF document text
- https://www.talakeel.com/uploaded_files/userfiles/files/coin-master-new-link-free-spin_GM406889139.pdfIn PDF document text
- https://www.talakeel.com/uploaded_files/userfiles/files/hacks-for-coin-master-game_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_004_off000053a1.bin`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x53A1	28152 bytes
SHA-256: `54e9d30c01123201437c5e06f1c55cf361b39b2094e3309c1e59cae5726c4bbc`
`font_01_sfnt_off0000949d.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x949D	8184 bytes
SHA-256: `5267349969336ffb76dd86a8b8b8900374687728d925be5be1ea414fa0de7d23`
`font_02_sfnt_off0000afbc.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xAFBC	18340 bytes
SHA-256: `383b1d6f347944e20328288fe5cf1d6e6525012059e3a3c68a0557f2d1f0cd2f`

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