Malicious PDF — malware analysis report

Static analysis result for SHA-256 1723f50964dd52dc…

MALICIOUS

PDF

42.0 KB Created: 2021-05-17 14:13:27 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 41436f16b74368428436ba5dc6435cdf SHA-1: 8b6cdccbeb5d4c70b3161abd521414206804c2d7 SHA-256: 1723f50964dd52dc7137bc802e2ceb1df92281292c0caaeea02c464cfc0c9db4
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to websites that claim to offer game hacks and free spins, indicating a lure for users to visit potentially malicious sites. The heuristic firings confirm these links point to known malicious redirectors and a link farm designed for SEO manipulation. While no scripts were extracted, the document's structure and embedded links strongly suggest a phishing or scam attempt, likely leading to malware download or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

Heuristics 5

  • 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.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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.xyz/app/406889139/coin-master-free-spins-2021-today-game-hack In PDF document text
    • https://www.manmed.info:443/images/coin-master-free-spins-hack-without-human-verification_GM406889139.pdfIn PDF document text
    • https://www.manmed.info:443/images/coin-master-free-spins-cheat_GM406889139.pdfIn PDF document text
    • https://www.manmed.info:443/images/coin-master-spin-hack_GM406889139.pdfIn PDF document text
    • https://www.manmed.info:443/images/how-to-get-hacks-on-minecraft_GM479516143.pdfIn PDF document text
    • https://www.manmed.info:443/images/gameoffice-net-hack-coin-master_GM406889139.pdfIn PDF document text
    • https://www.manmed.info:443/images/robux-com-free-robux_GM431946152.pdfIn PDF document text
    • https://www.manmed.info:443/images/coin-master-free-spins-link-today-twitter_GM406889139.pdfIn PDF document text
    • https://www.manmed.info:443/images/free-robux-generator-for-roblox-2021_GM431946152.pdfIn PDF document text
    • https://www.manmed.info:443/images/coin-master-daily-free-spins-25_GM406889139.pdfIn PDF document text
    • https://www.manmed.info:443/images/spin-free-coin-master_GM406889139.pdfIn PDF document text
    • https://www.manmed.info:443/images/coin-master-hack-spin_GM406889139.pdfIn PDF document text
    • https://www.manmed.info:443/images/minecraft-free-download-android-apk_GM479516143.pdfIn PDF document text
    • https://www.manmed.info:443/images/coin-master-free-coins-2021_GM406889139.pdfIn PDF document text
    • https://www.manmed.info:443/images/free-script-executor-roblox_GM431946152.pdfIn PDF document text
    • https://www.manmed.info:443/images/how-to-use-scripts-in-roblox-hack_GM431946152.pdfIn PDF document text
    • https://www.manmed.info:443/images/how-to-get-free-robux-fast-and-easy_GM431946152.pdfIn PDF document text
    • https://www.manmed.info:443/images/how-to-get-free-spins-on-coin-master-game_GM406889139.pdfIn PDF document text
    • https://www.manmed.info:443/images/free-robux-no-verification-2021-android_GM431946152.pdfIn PDF document text
    • https://www.manmed.info:443/images/free-spins-coin-master-android_GM406889139.pdfIn PDF document text
    • https://www.manmed.info:443/images/free-cheat-codes-for-coin-master_GM406889139.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_003_off0000491b.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x491B 24224 bytes
SHA-256: d0e26431759a6f417dcbc8f90ed6d5d14f1ae34014df805845916e55346aa4f2
font_01_sfnt_off0000809d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x809D 18644 bytes
SHA-256: d7949929735619194fc75e12c0f3ae3f795649f1857edc5f48659c3a35b254e1

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