Malicious PDF — malware analysis report

Static analysis result for SHA-256 8187ffa835620012…

MALICIOUS

PDF

35.9 KB Created: 2021-07-08 17:52:02 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 62d011dc342a5e9653260b5b10a3061b SHA-1: 819d804304f08db4d24b785af6e456982ed2e79a SHA-256: 8187ffa835620012a711da7e105bff0d9ac1c7a069eae5eb8172de39e713fa71
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains embedded links that redirect to malicious infrastructure, specifically promoting game hacks and generators. The ML classifier strongly indicated maliciousness, and the document body confirms the lure of 'Coin Master Mod Apk Free Download'. The primary attack pattern involves social engineering to trick users into visiting these malicious URLs, likely leading to further malware downloads or phishing attempts.

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/406889139/coin-master-mod-apk-free-download-for-android-game-hack In PDF document text
    • http://perpus.smkn1pemangkat.sch.id/repository/coin-master-free-spins-and-coins-daily_GM406889139.pdfIn PDF document text
    • http://perpus.smkn1pemangkat.sch.id/repository/how-to-hack-minecraft_GM479516143.pdfIn PDF document text
    • http://perpus.smkn1pemangkat.sch.id/repository/free-roblox-accoiunt_GM431946152.pdfIn PDF document text
    • http://perpus.smkn1pemangkat.sch.id/repository/roblox-free-executor-2021_GM431946152.pdfIn PDF document text
    • http://perpus.smkn1pemangkat.sch.id//repository/coin-master-hacked-apk-download-for-android_GM406889139.pdfIn PDF document text
    • http://perpus.smkn1pemangkat.sch.id//repository/cool-minecraft-hacks_GM479516143.pdfIn PDF document text
    • http://perpus.smkn1pemangkat.sch.id/repository/se-puede-hackear-coin-master_GM406889139.pdfIn PDF document text
    • http://perpus.smkn1pemangkat.sch.id/repository/how-to-get-more-spins-on-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://perpus.smkn1pemangkat.sch.id/repository/roblox-how-to-hack-accounts-with-cookie-editor_GM431946152.pdfIn PDF document text
    • http://perpus.smkn1pemangkat.sch.id//repository/robux-offer-wall_GM431946152.pdfIn PDF document text
    • http://perpus.smkn1pemangkat.sch.id/repository/free-generator_GM431946152.pdfIn PDF document text
    • http://perpus.smkn1pemangkat.sch.id//repository/how-to-hack-roblox-passwords_GM431946152.pdfIn PDF document text
    • http://perpus.smkn1pemangkat.sch.id//repository/daily-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://perpus.smkn1pemangkat.sch.id/repository/coin-master-free-spins-and-free-coins_GM406889139.pdfIn PDF document text
    • http://perpus.smkn1pemangkat.sch.id//repository/daily-coin-master-free-spin-link_GM406889139.pdfIn PDF document text
    • http://perpus.smkn1pemangkat.sch.id/repository/free-coin-master-links_GM406889139.pdfIn PDF document text
    • http://perpus.smkn1pemangkat.sch.id/repository/roblox-cbr-free-weekend-glitch_GM431946152.pdfIn PDF document text
    • http://perpus.smkn1pemangkat.sch.id//repository/www-roblox-com-robux_GM431946152.pdfIn PDF document text
    • http://perpus.smkn1pemangkat.sch.id/repository/how-to-cheat-noclip-in-roblox-2021_GM431946152.pdfIn PDF document text
    • http://perpus.smkn1pemangkat.sch.id/repository/roblox-hack-someone-39_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
stream_002_off00003460.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x3460 22944 bytes
SHA-256: 3b6691eeb4fd02b251416174d0683a2b632cd57889fbe39ae6a72bae2805a7c1
font_01_sfnt_off000067e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x67E2 18924 bytes
SHA-256: 9c48e35ea9a5dc8e10dc41a2ce9881e75ec73337895d61689671ae319a04d3e6

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