Malicious PDF — malware analysis report

Static analysis result for SHA-256 acc59b5e2456ae66…

MALICIOUS

PDF

34.4 KB Created: 2021-06-23 05:36:37 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 94a6f88fa9cf46391d7b50b8d77dee5e SHA-1: bdd025a65d1f2daad14405e0ed264c977aabdb9d SHA-256: acc59b5e2456ae66b3ebbbc185d9774858835e94088444ffbe196bbb9a71ea75
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple embedded links that redirect to sites offering game hacks and free currency, a common lure for malicious activity. The heuristic firings indicate these links point to known malicious redirector infrastructure. While no scripts were explicitly extracted, the document's structure and embedded URLs suggest it's designed to lead the user to download potentially malicious content or engage in phishing.

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.co/app/431946152/how-to-hack-theme-park-tycoon-2-roblox-game-hack In PDF document text
    • http://ycstamping.com.tw/image/data/files/coin-master-hack-version_GM406889139.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/how-to-get-free-pet-food-in-coin-master_GM406889139.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/coin-master-free-link-today_GM406889139.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/how-to-get-free-robux-without-downloading-anything_GM431946152.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/how-to-get-free-robux-on-roblox_GM431946152.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/legit-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/pubg-uc-redeem-code_GM1330123889.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/roblox-hacks-2021_GM431946152.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/codes-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/how-to-get-a-lot-of-robux_GM431946152.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/how-do-you-get-free-roblox-money_GM431946152.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/2021-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/free-spins-coin-master-legit_GM406889139.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/how-to-get-minecraft-java-edition-for-free_GM479516143.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/roblox-images_GM431946152.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/roblox-conins-free_GM431946152.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/free-tiktok-like_GM835599320.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/labyrinth-roblox-hacks_GM431946152.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/coin-master-hack-spins-ios_GM406889139.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/coin-master-free-spins-link-app-download_GM406889139.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_002_off00002dce.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x2DCE 22448 bytes
SHA-256: 98b5493cac01045898e4c6900dddd44545ab3149c734de54ddcb1037fed65266
font_01_sfnt_off00005fa2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5FA2 19704 bytes
SHA-256: 7576594db783eb29ae2e7f111bac6d725ceb7422d4de7e4f91f378566848c3b0

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