Malicious PDF — malware analysis report

Static analysis result for SHA-256 2d68d14a76c95d0b…

MALICIOUS

PDF

43.4 KB Created: 2021-05-12 06:39:14 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-24
MD5: d27eefd0b5af021fc756f88c75d43c14 SHA-1: 10bf53de6b125eec6dc65e5bed26f7ade318e3ad SHA-256: 2d68d14a76c95d0b074a8ce581e10d08b82ae73b2a1fc6ba44ba4308659bb20f
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links designed to appear as free generators or game hacks, with one prominent URL leading to a known malicious redirector. The document body and embedded links strongly suggest a phishing or scam attempt to trick users into visiting potentially harmful sites. No scripts were extracted, but the PDF structure and embedded URLs indicate a malicious intent to redirect users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

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/how-to-get-free-clothes-on-roblox-game-hack In PDF document text
    • https://humansci.kyst.com.tw/image/data/files/coin-master-free-2021-spin-link_GM406889139.pdfIn PDF document text
    • https://humansci.kyst.com.tw/image/data/files/coin-master-free-raid-link_GM406889139.pdfIn PDF document text
    • https://humansci.kyst.com.tw/image/data/files/how-to-hack-coin-master-with-game-guardian_GM406889139.pdfIn PDF document text
    • https://humansci.kyst.com.tw/image/data/files/free-coin-master-androd-cheats-2021_GM406889139.pdfIn PDF document text
    • https://humansci.kyst.com.tw/image/data/files/free-roblox-app_GM431946152.pdfIn PDF document text
    • https://humansci.kyst.com.tw/image/data/files/how-to-get-free-robux-without-downloading-any-apps_GM431946152.pdfIn PDF document text
    • https://humansci.kyst.com.tw/image/data/files/coin-master-hack-no-download_GM406889139.pdfIn PDF document text
    • https://humansci.kyst.com.tw/image/data/files/minecraft-java-edition-free-trial_GM479516143.pdfIn PDF document text
    • https://humansci.kyst.com.tw/image/data/files/how-to-hack-coin-master-game-2021_GM406889139.pdfIn PDF document text
    • https://humansci.kyst.com.tw/image/data/files/roblox-lawsuit_GM431946152.pdfIn PDF document text
    • https://humansci.kyst.com.tw/image/data/files/coin-master-hack-apk-35-33_GM406889139.pdfIn PDF document text
    • https://humansci.kyst.com.tw/image/data/files/real-robux_GM431946152.pdfIn PDF document text
    • https://humansci.kyst.com.tw/image/data/files/free-robux-codes-2021-real_GM431946152.pdfIn PDF document text
    • https://humansci.kyst.com.tw/image/data/files/coin-master-free-spins-11-01-2021_GM406889139.pdfIn PDF document text
    • https://humansci.kyst.com.tw/image/data/files/free-robux-sites-that-work_GM431946152.pdfIn PDF document text
    • https://humansci.kyst.com.tw/image/data/files/how-to-hack-roblox-accounts-2021_GM431946152.pdfIn PDF document text
    • https://humansci.kyst.com.tw/image/data/files/hack-coin-master-download_GM406889139.pdfIn PDF document text
    • https://humansci.kyst.com.tw/image/data/files/free-robux-generator-no-verification_GM431946152.pdfIn PDF document text
    • https://humansci.kyst.com.tw/image/data/files/roblox-free-robux-com_GM431946152.pdfIn PDF document text
    • https://humansci.kyst.com.tw/image/data/files/free-minecraft-printables-food-labels_GM479516143.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
stream_003_off00004b0b.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4B0B 26132 bytes
SHA-256: 3bd6f5a23c97dcd072a3196f048db32eb9bda08a29691c2057c22c119a3464cd
font_01_sfnt_off00008731.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8731 18384 bytes
SHA-256: 27f4650814c4f3019db148b37ee61815def53d60a0d59245006e52e54048c2c0

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