Malicious PDF — malware analysis report

Static analysis result for SHA-256 251bd10314d63d97…

MALICIOUS

PDF

34.0 KB Created: 2021-07-06 08:23:15 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 5825b7e239edfa9ec921aed8b76fa02b SHA-1: cd74f9a664480ca968815b42f1bdf73c420beda2 SHA-256: 251bd10314d63d97faace8f47b715394cb5ba5944d45e612b9284dab59a52925
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to known malicious redirectors, specifically advertising free game hacks and generators for popular games like Roblox and Coin Master. The document body and heuristics indicate a lure to download or access these "hacks", which ultimately redirects to the malicious URL http://netcdn.tw/app/431946152/actual-free-robux-game-hack. No scripts were extracted, but the primary attack vector is social engineering via a malicious link embedded within the document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 4

  • 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.
  • 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 http://netcdn.tw/app/431946152/actual-free-robux-game-hack In PDF document text
    • https://alimi.com.tw/upload/files/coin-master-daily-free-spins-link-facebook_GM406889139.pdfIn PDF document text
    • https://alimi.com.tw/upload/files/free-spins-coin-master-hack-2021_GM406889139.pdfIn PDF document text
    • https://alimi.com.tw/upload/files/how-to-win-free-robux-on-chest-open-in-roblox_GM431946152.pdfIn PDF document text
    • https://alimi.com.tw/upload/files/coin-master-hack-coins_GM406889139.pdfIn PDF document text
    • https://alimi.com.tw/upload/files/roblox-a340-free_GM431946152.pdfIn PDF document text
    • https://alimi.com.tw/upload/files/roblox-hair-girl-free_GM431946152.pdfIn PDF document text
    • https://alimi.com.tw/upload/files/free-admin-roblox-2021_GM431946152.pdfIn PDF document text
    • https://alimi.com.tw/upload/files/coin-master-free-spin-and-coin-link-today_GM406889139.pdfIn PDF document text
    • https://alimi.com.tw/upload/files/how-to-open-cheat-engine-in-roblox-2021_GM431946152.pdfIn PDF document text
    • https://alimi.com.tw/upload/files/free-spins-coin-master-app_GM406889139.pdfIn PDF document text
    • https://alimi.com.tw/upload/files/roblox-hackers-list_GM431946152.pdfIn PDF document text
    • https://alimi.com.tw/upload/files/free-coins-on-coin-master_GM406889139.pdfIn PDF document text
    • https://alimi.com.tw/upload/files/roblox-ninja-legends-free-vip-server_GM431946152.pdfIn PDF document text
    • https://alimi.com.tw/upload/files/www-robux_GM431946152.pdfIn PDF document text
    • https://alimi.com.tw/upload/files/how-to-change-roblox-name-for-free_GM431946152.pdfIn PDF document text
    • https://alimi.com.tw/upload/files/descargar-hacks-para-roblox-2021-sin-parchear_GM431946152.pdfIn PDF document text
    • https://alimi.com.tw/upload/files/how-to-get-free-robux-without-verification_GM431946152.pdfIn PDF document text
    • https://alimi.com.tw/upload/files/how-to-hack-on-roblox-teacup-hack_GM431946152.pdfIn PDF document text
    • https://alimi.com.tw/upload/files/roblox-hacks-vermillion_GM431946152.pdfIn PDF document text
    • https://alimi.com.tw/upload/files/free-attacks-on-coin-master_GM406889139.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00002e66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2E66 22352 bytes
SHA-256: 884095436170ff852884649989cca96c5e014e0f772ee572ae074f59b2e2ee6e
font_01_sfnt_off0000601d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x601D 18896 bytes
SHA-256: bd3de038992f776bb75c9d87ab01591e9a87ca5e55efa1086dfb4f2335c858c6

Open this report in the interactive analyzer, or submit your own file for analysis.