Malicious PDF — malware analysis report

Static analysis result for SHA-256 415c1bbcdde2e423…

MALICIOUS

PDF

37.3 KB Created: 2021-07-04 22:17:48 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-24
MD5: 764102b0fac302e254f75b04b3f1208d SHA-1: 67d17f855b89da5319a299e2d96908d7e9d3afc4 SHA-256: 415c1bbcdde2e4231583fe94d94a8f72cb4de9bcea0206b64b1aec8dbfd5aafc
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 game hacks and free in-game currency. The primary lure is the URL http://netcdn.tw/app/406889139/coin-master-free-spins-blogspot-game-hack, which is flagged as a malicious redirector. The document's content and embedded links suggest a social engineering tactic to trick users into visiting potentially harmful websites, likely for further malware delivery or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9886

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-blogspot-game-hack In PDF document text
    • https://flyingchalks.com/ckfinder/userfiles/files/how-to-get-free-robux-as-a-kid_GM431946152.pdfIn PDF document text
    • https://flyingchalks.com/ckfinder/userfiles/files/free-robux-hack-2021_GM431946152.pdfIn PDF document text
    • https://flyingchalks.com/ckfinder/userfiles/files/muscle-simulater-roblox-cheat-codes_GM431946152.pdfIn PDF document text
    • https://flyingchalks.com/ckfinder/userfiles/files/free-spins-coin-master-2021-no-verification_GM406889139.pdfIn PDF document text
    • https://flyingchalks.com/ckfinder/userfiles/files/roblox-free-robux-legit_GM431946152.pdfIn PDF document text
    • https://flyingchalks.com/ckfinder/userfiles/files/coin-master-facebook-page_GM406889139.pdfIn PDF document text
    • https://flyingchalks.com/ckfinder/userfiles/files/avatar-the-last-airbender-roblox_GM431946152.pdfIn PDF document text
    • https://flyingchalks.com/ckfinder/userfiles/files/free-robux-master_GM431946152.pdfIn PDF document text
    • https://flyingchalks.com/ckfinder/userfiles/files/free-roblox-avatar-ideas_GM431946152.pdfIn PDF document text
    • https://flyingchalks.com/ckfinder/userfiles/files/roblox-hack-download-link_GM431946152.pdfIn PDF document text
    • https://flyingchalks.com/ckfinder/userfiles/files/buy-robux-hack_GM431946152.pdfIn PDF document text
    • https://flyingchalks.com/ckfinder/userfiles/files/smart-lodhi-coin-master-hack_GM406889139.pdfIn PDF document text
    • https://flyingchalks.com/ckfinder/userfiles/files/free-robux-codes-generator-no-verification_GM431946152.pdfIn PDF document text
    • https://flyingchalks.com/ckfinder/userfiles/files/free-coin-master-coins-and-spins_GM406889139.pdfIn PDF document text
    • https://flyingchalks.com/ckfinder/userfiles/files/roblox-free-models_GM431946152.pdfIn PDF document text
    • https://flyingchalks.com/ckfinder/userfiles/files/robloxcom-avatar-free_GM431946152.pdfIn PDF document text
    • https://flyingchalks.com/ckfinder/userfiles/files/coin-mast-hacks_GM406889139.pdfIn PDF document text
    • https://flyingchalks.com/ckfinder/userfiles/files/how-to-get-free-robux-easy-hack_GM431946152.pdfIn PDF document text
    • https://flyingchalks.com/ckfinder/userfiles/files/roblox-credit-card-hack_GM431946152.pdfIn PDF document text
    • https://flyingchalks.com/ckfinder/userfiles/files/free-roblox-codes-toys_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000303c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x303C 23212 bytes
SHA-256: b1cbd6dd54b88c5ef49968078252a9d2e9e75af4bf2500284d85700aa14ac091
font_01_sfnt_off0000647a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x647A 2896 bytes
SHA-256: c1a618813a64314343402b2ec738fc11c4c912460a4c7ae3029924d2f9a229cd
font_02_sfnt_off00006e5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6E5F 18464 bytes
SHA-256: 05a87c5e5a55dd1cacb71415224dc1225f286447460dff7243b727236e2d7549

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