Malicious PDF — malware analysis report

Static analysis result for SHA-256 439bb1e8679a634b…

MALICIOUS

PDF

44.6 KB Created: 2021-06-09 15:38:40 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-24
MD5: 21a3216894c7d3e4b8743f07fe30042b SHA-1: 095976a5c373f2ef5e5f94cde4b516b4a7f4bec7 SHA-256: 439bb1e8679a634b0da5c56ab51ac3892d7f4c0cff91ee86e8f03a0b2a5abba9
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF document contains multiple links that redirect to malicious infrastructure, specifically promoting 'free generator / game hack' lures. The primary malicious URL identified is https://netcdn.tw/app/431946152/roblox-hacks-pc-game-hack. The document body and embedded artifacts suggest a lure designed to trick users into clicking these links, likely leading to further malware downloads or phishing attempts. The presence of multiple redirector links and the ML classifier's high confidence score support this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9865

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 https://netcdn.tw/app/431946152/roblox-hacks-pc-game-hack In PDF document text
    • http://perpus.smkn1pemangkat.sch.id//repository/vip-roblox-free_GM431946152.pdfIn PDF document text
    • http://perpus.smkn1pemangkat.sch.id/repository/free-printable-minecraft-coloring-pages_GM479516143.pdfIn PDF document text
    • http://perpus.smkn1pemangkat.sch.id/repository/free-robux-website_GM431946152.pdfIn PDF document text
    • http://perpus.smkn1pemangkat.sch.id/repository/free-coin-master-spins-links-2021_GM406889139.pdfIn PDF document text
    • http://perpus.smkn1pemangkat.sch.id/repository/free-robux-codes-no-verification_GM431946152.pdfIn PDF document text
    • http://perpus.smkn1pemangkat.sch.id/repository/can-you-download-minecraft-for-free_GM479516143.pdfIn PDF document text
    • http://perpus.smkn1pemangkat.sch.id/repository/8bp-hack-coin-master_GM406889139.pdfIn PDF document text
    • http://perpus.smkn1pemangkat.sch.id/repository/robux-com-free-robux_GM431946152.pdfIn PDF document text
    • http://perpus.smkn1pemangkat.sch.id/repository/coin-master-daily-free-spins-link-today-2021_GM406889139.pdfIn PDF document text
    • http://perpus.smkn1pemangkat.sch.id//repository/minecraft-free-download-mobile_GM479516143.pdfIn PDF document text
    • http://perpus.smkn1pemangkat.sch.id/repository/free-robux-no-verification_GM431946152.pdfIn PDF document text
    • http://perpus.smkn1pemangkat.sch.id/repository/freecoins_GM406889139.pdfIn PDF document text
    • http://perpus.smkn1pemangkat.sch.id//repository/wurst-18_GM479516143.pdfIn PDF document text
    • http://perpus.smkn1pemangkat.sch.id/repository/coin-master-hack-app-for-iphone_GM406889139.pdfIn PDF document text
    • http://perpus.smkn1pemangkat.sch.id/repository/hack-pour-level-dragon-ball-super-2-roblox_GM431946152.pdfIn PDF document text
    • http://perpus.smkn1pemangkat.sch.id//repository/80-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://perpus.smkn1pemangkat.sch.id/repository/how-to-get-free-roblox-card-codes-hack_GM431946152.pdfIn PDF document text
    • http://perpus.smkn1pemangkat.sch.id/repository/roblox-hack-codes_GM431946152.pdfIn PDF document text
    • http://perpus.smkn1pemangkat.sch.id//repository/coin-master-free-spins-link-blogspot-today_GM406889139.pdfIn PDF document text
    • http://perpus.smkn1pemangkat.sch.id//repository/can-you-make-a-minecraft-server-for-free_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_004_off00005243.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5243 25028 bytes
SHA-256: e7016ed41a10146ea357d5f51dda6d4a142c5954b2cf6f46bc39d2096b66c1a8
font_01_sfnt_off00008b60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8B60 18336 bytes
SHA-256: 18e847d53a202b50239fa087d615240fab8ef1ed8f788c31c98e99a7942b5f2e

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