Malicious PDF — malware analysis report

Static analysis result for SHA-256 54b396731fedc2a5…

MALICIOUS

PDF

35.9 KB Created: 2021-06-27 00:14:29 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-15
MD5: f5f2a5a40fe732cc85b3f2bc73daa037 SHA-1: 95625369c4b2b5aaf0359580bc0aa50bb6c70228 SHA-256: 54b396731fedc2a5e6cb9a25ac0372e5f424beb275b3ff3da5e294df4cc10a2a
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links, including one to a known malicious redirector infrastructure at http://netcdn.co/app/431946152/hack-script-download-roblox-game-hack. The document body and embedded links suggest a lure for users seeking game hacks or cheats, likely leading to the download of a malicious script. 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.co/app/431946152/hack-script-download-roblox-game-hack In PDF document text
    • http://ycstamping.com.tw/image/data/files/win-free-robux_GM431946152.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/do-you-get-minecraft-windows-10-for-free_GM479516143.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/roblox-robux-hack_GM431946152.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/coin-master-hack-without-human-verification-2021_GM406889139.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/roblox-hack-1000000-robux_GM431946152.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/robux-cheat_GM431946152.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/download-minecraft-free-hiapphere_GM479516143.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/roblox-free-robux-no-verification_GM431946152.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/get-free-spins-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/minecraft-pe-server-hosting-free_GM479516143.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/how-to-get-free-coins-on-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/coin-master-rewards-free-spins_GM406889139.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/free-robux-generator-no-human-verification-2021_GM431946152.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/free-robux-3-steps_GM431946152.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/free-hair-roblox_GM431946152.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/cheat-codes-for-bank-tycoon-roblox_GM431946152.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/roblox-map-editor-hack_GM431946152.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/get-free-robux-now_GM431946152.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/coin-master-hack-mod-apk-android-1_GM406889139.pdfIn PDF document text
    • http://ycstamping.com.tw/image/data/files/get-free-robux-no-verification_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Related samples 7

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
stream_002_off0000302f.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x302F 23508 bytes
SHA-256: f0ee002a2238b9557fcd4033562bb22122a2071fca76bef51bc06d6c493ae7e7
font_01_sfnt_off0000658e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x658E 19564 bytes
SHA-256: 7cc9f031208e8cc36142b6f99f57c91c18f535b285dbff7b465acfbdb084eeca

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