PDF malware analysis — malicious · 9b1b4c3798fa2da8

MALICIOUS

PDF

50.8 KB Created: 2021-05-11 15:30:40 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-22

MD5: 50ef056de3bb77e193ffe5bc96aeb500 SHA-1: e2abc43fed20f0751a50f2fc20ffefe86525da29 SHA-256: 9b1b4c3798fa2da8f5abc16691f45d5962a79bdf2d7131e59d43eb5f8f589f5f

220 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF contains numerous links to websites that appear to be part of a link farm designed to attract users searching for game-related cheats or currency. The primary redirector URL, https://netcdn.xyz/app/431946152/free-robux-images-game-hack, is flagged as malicious. The document body, though heavily obfuscated, contains references to these lures and embedded URLs, suggesting a social engineering tactic to drive traffic to potentially malicious sites. No scripts were extracted, but the overall structure and linked content indicate a phishing or malware distribution attempt.

Machine Learning

Nyx PDF Classifier malicious score 0.9349

Heuristics 5

PDF links to a 'free generator / game hack' redirector critical 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. CRITICAL on its own: the /app/<id>/<slug>-game-hack path shape is unambiguous scam infra, and the host rotates so a host-list match can't be relied on.
PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK

PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
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.
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
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-images-game-hack In PDF document text
- http://www.bestbist.com/assets/uploads/pages/files/is-free-robux-real_GM431946152.pdfIn PDF document text
- http://www.bestbist.com/assets/uploads/pages/files/how-to-get-more-spins-on-coin-master-hack_GM406889139.pdfIn PDF document text
- http://www.bestbist.com/assets/uploads/pages/files/mcpe_GM479516143.pdfIn PDF document text
- http://www.bestbist.com/assets/uploads/pages/files/coin-master-free-spins-and-coins-today-gift-reward_GM406889139.pdfIn PDF document text
- http://www.bestbist.com/assets/uploads/pages/files/coin-master-free-spins-hack_GM406889139.pdfIn PDF document text
- http://www.bestbist.com/assets/uploads/pages/files/roblox-free-draw_GM431946152.pdfIn PDF document text
- http://www.bestbist.com/assets/uploads/pages/files/coin-master-free-spins-link-download-for-iphone_GM406889139.pdfIn PDF document text
- http://www.bestbist.com/assets/uploads/pages/files/coin-master-free-daily-spins-link_GM406889139.pdfIn PDF document text
- http://www.bestbist.com/assets/uploads/pages/files/how-to-get-java-minecraft-free_GM479516143.pdfIn PDF document text
- http://www.bestbist.com/assets/uploads/pages/files/google-coin-master-free-spins_GM406889139.pdfIn PDF document text
- http://www.bestbist.com/assets/uploads/pages/files/how-to-get-robux-for-free-2021_GM431946152.pdfIn PDF document text
- http://www.bestbist.com/assets/uploads/pages/files/how-to-get-minecraft-windows-10-for-free-2021_GM479516143.pdfIn PDF document text
- http://www.bestbist.com/assets/uploads/pages/files/coin-master-daily-free-spins-and-coins_GM406889139.pdfIn PDF document text
- http://www.bestbist.com/assets/uploads/pages/files/coin-master-free-spins-2021-app-download_GM406889139.pdfIn PDF document text
- http://www.bestbist.com/assets/uploads/pages/files/how-to-get-free-coins-on-coin-master_GM406889139.pdfIn PDF document text
- http://www.bestbist.com/assets/uploads/pages/files/coin-master-hack-app_GM406889139.pdfIn PDF document text
- http://www.bestbist.com/assets/uploads/pages/files/how-to-get-minecraft-for-free-on-mac_GM479516143.pdfIn PDF document text
- http://www.bestbist.com/assets/uploads/pages/files/coin-master-free-stuff-links_GM406889139.pdfIn PDF document text
- http://www.bestbist.com/assets/uploads/pages/files/www-claim-gg-to-earn-free-robux_GM431946152.pdfIn PDF document text
- http://www.bestbist.com/assets/uploads/pages/files/hack-coin-master-using-pc_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
`font_00_sfnt_off00004d81.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x4D81	26008 bytes
SHA-256: `8b4a4dcbc3140cc71a71f03eac6ec9dd6d08a514d0cec3aa3d1e800df115ef19`
`font_01_sfnt_off000087ca.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x87CA	8252 bytes
SHA-256: `7ebedd6b182173c8e55836cb0d114b2c4a0ac85c96a51b9f0706c935f8415fea`
`font_02_sfnt_off0000a2df.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xA2DF	18792 bytes
SHA-256: `a2580c58451f3b1d88c8ceab1016c43f7244c9e681afad5968b7c22bbe0132ae`

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