PDF malware analysis — malicious · de553bb3a843dbc3

MALICIOUS

PDF

46.4 KB Created: 2021-05-13 17:33:25 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-02

MD5: e0e8acf2646e90dff789a04f33866bdc SHA-1: b49c19cb61311fb9d481f84c8678a856c720a7a3 SHA-256: de553bb3a843dbc3334c147510742d09285468b2b059775ff5a75d8f9e7d984d

182 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 0.8948

Heuristics 6

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.
Payment redirection / bank-detail change lure high SE_PAYMENT_REDIRECT_LURE

Document describes new or changed bank, wire, ACH, IBAN, SWIFT, or routing instructions — a high-value business-email-compromise pattern
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-real-game-hack PDF link annotation
- http://www.highlandernepal.com/assets/ckfinder/userfiles/files/free-downloads-for-coin-master-daily-rewards_GM406889139.pdfIn PDF document text
- http://www.highlandernepal.com/assets/ckfinder/userfiles/files/free-robux-place_GM431946152.pdfIn PDF document text
- http://www.highlandernepal.com/assets/ckfinder/userfiles/files/how-do-you-get-free-robux-2021_GM431946152.pdfIn PDF document text
- http://www.highlandernepal.com/assets/ckfinder/userfiles/files/oprewards-login_GM431946152.pdfIn PDF document text
- http://www.highlandernepal.com/assets/ckfinder/userfiles/files/how-to-get-1-million-robux-for-free-2021_GM431946152.pdfIn PDF document text
- http://www.highlandernepal.com/assets/ckfinder/userfiles/files/roblox-free-clothes-codes_GM431946152.pdfIn PDF document text
- http://www.highlandernepal.com/assets/ckfinder/userfiles/files/coin-master-heaven-free-spins-today_GM406889139.pdfIn PDF document text
- http://www.highlandernepal.com/assets/ckfinder/userfiles/files/master-free-spin-and-coin-links-html-m-1_GM406889139.pdfIn PDF document text
- http://www.highlandernepal.com/assets/ckfinder/userfiles/files/free-spin-link-coin-master-today_GM406889139.pdfIn PDF document text
- http://www.highlandernepal.com/assets/ckfinder/userfiles/files/how-to-get-free-spins-on-coin-master-2021_GM406889139.pdfIn PDF document text
- http://www.highlandernepal.com/assets/ckfinder/userfiles/files/coin-master-hack-without-verification-code_GM406889139.pdfIn PDF document text
- http://www.highlandernepal.com/assets/ckfinder/userfiles/files/free-spins-for-coin-master_GM406889139.pdfIn PDF document text
- http://www.highlandernepal.com/assets/ckfinder/userfiles/files/free-domain-for-minecraft-server_GM479516143.pdfIn PDF document text
- http://www.highlandernepal.com/assets/ckfinder/userfiles/files/robux-gift-card-free_GM431946152.pdfIn PDF document text
- http://www.highlandernepal.com/assets/ckfinder/userfiles/files/coin-master-hack-version-33-2_GM406889139.pdfIn PDF document text
- http://www.highlandernepal.com/assets/ckfinder/userfiles/files/coin-master-club-hack_GM406889139.pdfIn PDF document text
- http://www.highlandernepal.com/assets/ckfinder/userfiles/files/daily-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
- http://www.highlandernepal.com/assets/ckfinder/userfiles/files/coin-master-hack-without-verification_GM406889139.pdfIn PDF document text
- http://www.highlandernepal.com/assets/ckfinder/userfiles/files/coin-master-heaven-daily-free-spins-link-today_GM406889139.pdfIn PDF document text
- http://www.highlandernepal.com/assets/ckfinder/userfiles/files/how-to-get-free-robux-fast-and-easy_GM431946152.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_off00004ca9.bin`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x4CA9	25844 bytes
SHA-256: `7bb68ba6e5d40c7d47739ea7fd258c5b437d8fc7ecb48af8a92f30e982bf6592`
`font_01_sfnt_off00008934.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x8934	2832 bytes
SHA-256: `77ae1c4cffa647a8fd533dfa4102e94364989f9e80b9cd131876e9d1005899a2`
`font_02_sfnt_off000092e5.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x92E5	18316 bytes
SHA-256: `0bff543ee19f4ca1641aaad3399cdc0a52c610caf2abd08cd8655404047fbeff`

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