Malicious PDF — malware analysis report

Static analysis result for SHA-256 55c8758b03a5018c…

MALICIOUS

PDF

34.6 KB Created: 2021-07-06 13:10:06 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-16
MD5: ff9abd823fd380a96b6a1d2c1b4c60a0 SHA-1: 0e7a0e98940e186f6fce97a09d75e611ff25236a SHA-256: 55c8758b03a5018c823e770d6f2571fdfcdd4813d9c35e2d0ab59f70b7f14a70
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document contains multiple links, including one to a known malicious redirector at http://netcdn.tw/app/406889139/coin-master-free-spins-youthnow-game-hack. The document body and embedded URLs suggest a lure for game cheats or free resources, which is a common tactic for phishing and malware distribution. 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.tw/app/406889139/coin-master-free-spins-youthnow-game-hack In PDF document text
    • https://www.man2samarinda.com/__statics/gudangsoal/files/coin-master-links-for-free-spins-2021_GM406889139.pdfIn PDF document text
    • https://man2samarinda.com/__statics/gudangsoal/files/blogger-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • https://man2samarinda.com/__statics/gudangsoal/files/free-robux-promo-codes-2021_GM431946152.pdfIn PDF document text
    • https://www.man2samarinda.com/__statics/gudangsoal/files/tiktok-free-80_GM835599320.pdfIn PDF document text
    • https://www.man2samarinda.com/__statics/gudangsoal/files/free-minecraft-account-generator_GM479516143.pdfIn PDF document text
    • https://man2samarinda.com/__statics/gudangsoal/files/is-roblox-free-on-ps4_GM431946152.pdfIn PDF document text
    • https://man2samarinda.com/__statics/gudangsoal/files/airplane-2-hack-roblox_GM431946152.pdfIn PDF document text
    • https://www.man2samarinda.com/__statics/gudangsoal/files/coin-master-fan-page-facebook_GM406889139.pdfIn PDF document text
    • https://www.man2samarinda.com/__statics/gudangsoal/files/roblox-hacks-trial_GM431946152.pdfIn PDF document text
    • https://www.man2samarinda.com/__statics/gudangsoal/files/free-spins-coin-master-hack_GM406889139.pdfIn PDF document text
    • https://man2samarinda.com/__statics/gudangsoal/files/how-to-get-free-robux-2021_GM431946152.pdfIn PDF document text
    • https://www.man2samarinda.com/__statics/gudangsoal/files/get-free-tiktok-likes_GM835599320.pdfIn PDF document text
    • https://man2samarinda.com/__statics/gudangsoal/files/how-to-get-free-robux-clothes_GM431946152.pdfIn PDF document text
    • https://man2samarinda.com/__statics/gudangsoal/files/how-to-get-free-robux-not-a-scam_GM431946152.pdfIn PDF document text
    • https://www.man2samarinda.com/__statics/gudangsoal/files/haktutsin-2021-09-coinmaster50freespinandcoinlinkhtml-m-1_GM406889139.pdfIn PDF document text
    • https://man2samarinda.com/__statics/gudangsoal/files/haktuts-coin-master-free-spin-link_GM406889139.pdfIn PDF document text
    • https://www.man2samarinda.com/__statics/gudangsoal/files/coin-master-free-spins-app-for-iphone_GM406889139.pdfIn PDF document text
    • https://www.man2samarinda.com/__statics/gudangsoal/files/coin-master-apk-mod_GM406889139.pdfIn PDF document text
    • https://man2samarinda.com/__statics/gudangsoal/files/coin-master-attack-hack-apk_GM406889139.pdfIn PDF document text
    • https://man2samarinda.com/__statics/gudangsoal/files/how-to-get-hacks-on-roblox_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_off00003055.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x3055 22676 bytes
SHA-256: d1ff122a9f669c4c13e115d23f40690018970c216ed023945796538bca72e21c
font_01_sfnt_off000062e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x62E2 18808 bytes
SHA-256: c55b3dffd290e9a0589896d87f4add06f602089722db7dbef51869cc81ac9e31

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