Malicious PDF — malware analysis report

Static analysis result for SHA-256 40dd2ef48174eedf…

MALICIOUS

PDF

33.6 KB Created: 2021-07-20 02:45:18 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 28e676d785ea29ebe99c8f33bd7377b3 SHA-1: bff4d96cd7977bd271ff1d58fddbf8b7de5c16a8 SHA-256: 40dd2ef48174eedf622cfcbd329e59a62930e04db9270ac5f91bd19aa170dbb0
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document contains multiple links that redirect to malicious infrastructure, specifically promoting 'free generators' or 'game hacks' for popular games. The primary lure URL is http://netcdn.tw/app/406889139/coin-master-daily-free-spins-game-hack. While no scripts were extracted, the document's structure and embedded URLs strongly indicate a phishing or scam attempt designed to lead users to potentially harmful content or further malicious downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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-daily-free-spins-game-hack In PDF document text
    • https://morishita-tc.com.tw/image/data/files/coin-master-daily-free-spins-link-app_GM406889139.pdfIn PDF document text
    • https://morishita-tc.com.tw/image/data/files/free-robux-quiz_GM431946152.pdfIn PDF document text
    • https://morishita-tc.com.tw/image/data/files/free-robux-gift-card_GM431946152.pdfIn PDF document text
    • https://morishita-tc.com.tw/image/data/files/free-coins-on-coin-master_GM406889139.pdfIn PDF document text
    • https://morishita-tc.com.tw/image/data/files/minecraft-free-ios_GM479516143.pdfIn PDF document text
    • https://morishita-tc.com.tw/image/data/files/free-minecraft-resource-packs_GM479516143.pdfIn PDF document text
    • https://morishita-tc.com.tw/image/data/files/how-to-get-free-tiktok-followers-without-human-verification_GM835599320.pdfIn PDF document text
    • https://morishita-tc.com.tw/image/data/files/free-fans-on-tiktok_GM835599320.pdfIn PDF document text
    • https://morishita-tc.com.tw/image/data/files/minecraft-hacked-client_GM479516143.pdfIn PDF document text
    • https://morishita-tc.com.tw/image/data/files/how-to-get-robux-for-free-2021_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_off00002d5c.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x2D5C 23028 bytes
SHA-256: d50e76d8eca156a73d51c46cb7d86ab04eac651ff801118dc8b2dc19b4c43ce9
font_01_sfnt_off00006129.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6129 18308 bytes
SHA-256: e42bde5f0ce420544e36e42831a39ceefa2103814e02a0c87b67b282abd28734