Malicious PDF — malware analysis report

Static analysis result for SHA-256 321d5053d0a8f52a…

MALICIOUS

PDF

43.2 KB Created: 2021-05-11 07:08:43 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 9f274fb72b320532086f6e86ecc30289 SHA-1: c9b65824adb0dd8324961066235c6249fe4b074d SHA-256: 321d5053d0a8f52abebcc34798912631f81fe2046cb233126c609873ff739bc7
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

This PDF document contains multiple external links, identified as a 'link farm' and 'game hack' lure. The primary URL redirects to a page offering 'free spin and coin links', suggesting a scam or phishing attempt. While no scripts were directly extracted, the PDF structure and embedded links indicate an attempt to redirect users to potentially malicious content, possibly for SEO manipulation or to deliver a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

Heuristics 5

  • 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.
  • PDF links to a 'free generator / game hack' redirector high 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.
  • 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
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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/master-free-spin-and-coin-links-html-m-1-game-hack PDF link annotation
    • http://elearning.man1indramayu.sch.id/__statics/gudangsoal/files/free-coins-for-flip-master-online_GM406889139.pdfIn PDF document text
    • https://elearning.man1indramayu.sch.id/__statics/gudangsoal/files/free-robux-com-2021_GM431946152.pdfIn PDF document text
    • https://elearning.man1indramayu.sch.id/__statics/gudangsoal/files/coin-master-online-hack-link_GM406889139.pdfIn PDF document text
    • https://elearning.man1indramayu.sch.id/__statics/gudangsoal/files/free-robux-games-that-actually-work_GM431946152.pdfIn PDF document text
    • http://elearning.man1indramayu.sch.id/__statics/gudangsoal/files/can-i-play-roblox-for-free_GM431946152.pdfIn PDF document text
    • https://elearning.man1indramayu.sch.id/__statics/gudangsoal/files/robux-hack-2021_GM431946152.pdfIn PDF document text
    • https://elearning.man1indramayu.sch.id/__statics/gudangsoal/files/coin-master-free-spins-hack-link_GM406889139.pdfIn PDF document text
    • https://elearning.man1indramayu.sch.id/__statics/gudangsoal/files/how-to-get-free-roblox-hair_GM431946152.pdfIn PDF document text
    • https://elearning.man1indramayu.sch.id/__statics/gudangsoal/files/coin-master-time-speed-hack_GM406889139.pdfIn PDF document text
    • https://elearning.man1indramayu.sch.id/__statics/gudangsoal/files/how-to-sue-roblox_GM431946152.pdfIn PDF document text
    • http://elearning.man1indramayu.sch.id/__statics/gudangsoal/files/cone-master_GM406889139.pdfIn PDF document text
    • http://elearning.man1indramayu.sch.id/__statics/gudangsoal/files/minecraft-free-download-android-apk-014-0_GM479516143.pdfIn PDF document text
    • http://elearning.man1indramayu.sch.id/__statics/gudangsoal/files/hackear-coin-master-sin-verificacion_GM406889139.pdfIn PDF document text
    • http://elearning.man1indramayu.sch.id/__statics/gudangsoal/files/coin-master-hack-android_GM406889139.pdfIn PDF document text
    • http://elearning.man1indramayu.sch.id/__statics/gudangsoal/files/free-robux-without-any-verification_GM431946152.pdfIn PDF document text
    • http://elearning.man1indramayu.sch.id/__statics/gudangsoal/files/how-do-i-get-free-robux-on-roblox_GM431946152.pdfIn PDF document text
    • http://elearning.man1indramayu.sch.id/__statics/gudangsoal/files/free-spins-coin-master-hack-2021_GM406889139.pdfIn PDF document text
    • https://elearning.man1indramayu.sch.id/__statics/gudangsoal/files/how-much-robux-can-you-get-with-1-million-dollars_GM431946152.pdfIn PDF document text
    • https://elearning.man1indramayu.sch.id/__statics/gudangsoal/files/roblox-com-free_GM431946152.pdfIn PDF document text
    • https://elearning.man1indramayu.sch.id/__statics/gudangsoal/files/free-robux-hacker-us_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_003_off00004d94.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4D94 24368 bytes
SHA-256: 6a6bc62130d45299818d2207b31a06aa6e6d4cd3ce5cdc5c8fc6079e1ce5d8f8
font_01_sfnt_off0000857c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x857C 18672 bytes
SHA-256: e8e5c78a3c75332e87dcced76b09371611da69ae485f860408bab2f18198baf8

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