Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a54d1c17549da1b…

MALICIOUS

PDF

34.9 KB Created: 2021-07-08 17:10:22 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-27
MD5: d68d3dfa31fe02be6794a1fb775a80d9 SHA-1: c24c10b665446193f7a5798fdff6c4d573504ae8 SHA-256: 3a54d1c17549da1ba82dbca6682527aa02b135030078a789988bc953c8bd8b51
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to known malicious redirectors, disguised as "free generator / game hack" lures. The document body explicitly mentions "how-to-find-coin-master-free-spin-link-game-hack" and includes a primary malicious URL. The presence of embedded URLs and the nature of the lures strongly suggest this document is intended to lead users to potentially harmful websites, likely for further exploitation or phishing. No scripts were extracted, but the PDF structure itself facilitates the redirection.

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/how-to-find-coin-master-free-spin-link-game-hack In PDF document text
    • http://razredna-nastava.net/files/free-robux-codes-2021-live_GM431946152.pdfIn PDF document text
    • http://razredna-nastava.net/files/obby-for-free-robux-real_GM431946152.pdfIn PDF document text
    • http://razredna-nastava.net/files/sites-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://razredna-nastava.net/files/free-robux-no-hack-no-download-no-survey_GM431946152.pdfIn PDF document text
    • http://razredna-nastava.net/files/free-roblox-toy-codes-not-used_GM431946152.pdfIn PDF document text
    • http://razredna-nastava.net/files/get-free-robux-gigicom_GM431946152.pdfIn PDF document text
    • https://razredna-nastava.net/files/how-to-get-free-spins-and-coins-on-coin-master_GM406889139.pdfIn PDF document text
    • https://razredna-nastava.net/files/minecraft-for-macbook-free_GM479516143.pdfIn PDF document text
    • http://razredna-nastava.net/files/wurst-18_GM479516143.pdfIn PDF document text
    • http://razredna-nastava.net/files/free-daily-spin-coin-master-game_GM406889139.pdfIn PDF document text
    • http://razredna-nastava.net/files/free-daily-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://razredna-nastava.net/files/how-to-get-free-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://razredna-nastava.net/files/bubble-gum-simulator-roblox-hack_GM431946152.pdfIn PDF document text
    • http://razredna-nastava.net/files/cheat-engine-wont-work-on-roblox_GM431946152.pdfIn PDF document text
    • http://razredna-nastava.net/files/coin-master-card-link-free_GM406889139.pdfIn PDF document text
    • https://razredna-nastava.net/files/free-robux-without-human-verification_GM431946152.pdfIn PDF document text
    • https://razredna-nastava.net/files/mobihack-roblox-hack_GM431946152.pdfIn PDF document text
    • https://razredna-nastava.net/files/free-robux-accounts-2021_GM431946152.pdfIn PDF document text
    • http://razredna-nastava.net/files/hacking-laurenzside-roblox_GM431946152.pdfIn PDF document text
    • https://razredna-nastava.net/files/free-robux-free-hack_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_off0000307b.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x307B 23308 bytes
SHA-256: 8f597da55fdabc8edf6ec2b7cfc9c62ff3fe8f162f6e2ffd64510d395402629d
font_01_sfnt_off000064b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x64B6 18680 bytes
SHA-256: a0d94fd422aef03acd4c9f33d48efa0ddca3b5d0b297c609026c47b93f7cc900

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