Malicious PDF — malware analysis report

Static analysis result for SHA-256 82d46e5e397d43a6…

MALICIOUS

PDF

46.1 KB Created: 2021-06-03 20:36:35 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-12
MD5: d1e9956b713bd14fd0e3bf6dc4e66dd0 SHA-1: eab63cc094af9b110d4be1f7a8adf28f80036c21 SHA-256: 82d46e5e397d43a67fb33eab5f57fe79d8324c42729f9dbbb95e57e292531141
160 Risk Score

Malware Insights

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

The PDF document contains multiple links designed to lure users with promises of free game currency or hacks. These links redirect to malicious infrastructure, indicating a phishing or scam attempt. The ML classifier also flagged this PDF as malicious, supporting the observed malicious behavior.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9864

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 https://netcdn.online/app/431946152/how-to-hack-roblox-for-robux-game-hack In PDF document text
    • https://www.denpasarinstitute.com/new/public/ckfinder/userfiles/files/roblox-free-robux-generator_GM431946152.pdfIn PDF document text
    • https://www.denpasarinstitute.com/new/public/ckfinder/userfiles/files/make-free-robux_GM431946152.pdfIn PDF document text
    • https://www.denpasarinstitute.com/new/public/ckfinder/userfiles/files/how-do-you-get-free-robux-2021_GM431946152.pdfIn PDF document text
    • https://www.denpasarinstitute.com/new/public/ckfinder/userfiles/files/how-to-get-free-robux-codes_GM431946152.pdfIn PDF document text
    • https://www.denpasarinstitute.com/new/public/ckfinder/userfiles/files/get-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • https://www.denpasarinstitute.com/new/public/ckfinder/userfiles/files/minecraft-free-ios-no-verification_GM479516143.pdfIn PDF document text
    • https://www.denpasarinstitute.com/new/public/ckfinder/userfiles/files/free-coins-coin-master-2021_GM406889139.pdfIn PDF document text
    • https://www.denpasarinstitute.com/new/public/ckfinder/userfiles/files/hackear-coin-master_GM406889139.pdfIn PDF document text
    • https://www.denpasarinstitute.com/new/public/ckfinder/userfiles/files/roblox-comcom_GM431946152.pdfIn PDF document text
    • https://www.denpasarinstitute.com/new/public/ckfinder/userfiles/files/minecraft-pe-hacks_GM479516143.pdfIn PDF document text
    • https://www.denpasarinstitute.com/new/public/ckfinder/userfiles/files/free-spins-coin-master-2021-no-verification_GM406889139.pdfIn PDF document text
    • https://www.denpasarinstitute.com/new/public/ckfinder/userfiles/files/coin-master-spin-hack_GM406889139.pdfIn PDF document text
    • https://www.denpasarinstitute.com/new/public/ckfinder/userfiles/files/give-me-free-robux_GM431946152.pdfIn PDF document text
    • https://www.denpasarinstitute.com/new/public/ckfinder/userfiles/files/coin-master-download_GM406889139.pdfIn PDF document text
    • https://www.denpasarinstitute.com/new/public/ckfinder/userfiles/files/chisel-and-bits-mod-minecraft-pe_GM479516143.pdfIn PDF document text
    • https://www.denpasarinstitute.com/new/public/ckfinder/userfiles/files/free-roblox-accounts-2021-with-robux_GM431946152.pdfIn PDF document text
    • https://www.denpasarinstitute.com/new/public/ckfinder/userfiles/files/coin-master-free-coins-link-facebook_GM406889139.pdfIn PDF document text
    • https://www.denpasarinstitute.com/new/public/ckfinder/userfiles/files/is-there-any-way-to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://www.denpasarinstitute.com/new/public/ckfinder/userfiles/files/how-to-get-free-spins-in-coin-master_GM406889139.pdfIn PDF document text
    • https://www.denpasarinstitute.com/new/public/ckfinder/userfiles/files/free-coin-master-spins-no-verification_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_004_off00005330.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5330 26644 bytes
SHA-256: d23b0c48c0e857ea91cae8ae07264dce054316e2b7f0c6b3bd77db8844f44a61
font_01_sfnt_off00009082.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9082 18648 bytes
SHA-256: 7689b6731d47fc176aef925fc5194a10a34d162e90d7014a3ccea13949bcaf7e

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