Malicious PDF — malware analysis report

Static analysis result for SHA-256 8774fb0369ebcecb…

MALICIOUS

PDF

34.6 KB Created: 2021-07-03 14:11:31 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 1d8284a642fedc4342c6b36de7f4da2e SHA-1: 08ee4c600c5f4bda07c5732b3f57d7b64bce7d5e SHA-256: 8774fb0369ebcecba298f05ebaee4b28ae4058ccae72c21ef6772a409f28e12c
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a lure for a "free generator / game hack" which links to a known malicious redirector. The embedded URL is designed to trick users into downloading further malicious content or visiting phishing sites. The ML classifier also strongly indicated maliciousness.

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/free-robux-without-any-verification-game-hack In PDF document text
    • https://delsys.com.tw/image/data/files/free-admin-roblox-2021_GM431946152.pdfIn PDF document text
    • https://delsys.com.tw/image/data/files/free-admin-hack-roblox-kazok_GM431946152.pdfIn PDF document text
    • https://delsys.com.tw/image/data/files/roblox-booga-booga-hack_GM431946152.pdfIn PDF document text
    • https://delsys.com.tw/image/data/files/microsoft-free-robux_GM431946152.pdfIn PDF document text
    • https://delsys.com.tw/image/data/files/free-vip-in-roblox_GM431946152.pdfIn PDF document text
    • https://delsys.com.tw/image/data/files/free-exploits-website-downloads-roblox_GM431946152.pdfIn PDF document text
    • https://delsys.com.tw/image/data/files/1x1x1x1-hacker-roblox_GM431946152.pdfIn PDF document text
    • https://delsys.com.tw/image/data/files/free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • https://delsys.com.tw/image/data/files/coin-master-free-online-game_GM406889139.pdfIn PDF document text
    • https://delsys.com.tw/image/data/files/free-robux-stream_GM431946152.pdfIn PDF document text
    • https://delsys.com.tw/image/data/files/how-to-get-free-robux-without-verification-or-surveys_GM431946152.pdfIn PDF document text
    • https://delsys.com.tw/image/data/files/best-free-robux-sites_GM431946152.pdfIn PDF document text
    • https://delsys.com.tw/image/data/files/free-robux-legit-works_GM431946152.pdfIn PDF document text
    • https://delsys.com.tw/image/data/files/freerobuxhack-us_GM431946152.pdfIn PDF document text
    • https://delsys.com.tw/image/data/files/coin-master-hack-version-download_GM406889139.pdfIn PDF document text
    • https://delsys.com.tw/image/data/files/robux-promocodes-no-hacking_GM431946152.pdfIn PDF document text
    • https://delsys.com.tw/image/data/files/roblox-admin-commands-hack-2021_GM431946152.pdfIn PDF document text
    • https://delsys.com.tw/image/data/files/how-to-hack-coin-master-ios-jailbreak_GM406889139.pdfIn PDF document text
    • https://delsys.com.tw/image/data/files/coin-master-hack-generator-tool_GM406889139.pdfIn PDF document text
    • https://delsys.com.tw/image/data/files/free-robux-giveaway_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00002ea5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2EA5 22444 bytes
SHA-256: a832b094b72916c0fcf020cdd12aa94d623007554dffa784ff921cd6618e6695
font_01_sfnt_off00006099.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6099 19620 bytes
SHA-256: 98e25ba6f0db8882549c0e371305563de57acb07d7fce2330b7496bf897a2717

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