Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba99082947dcb430…

MALICIOUS

PDF

43.6 KB Created: 2021-06-03 06:09:51 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 6da4ef1d2f678987fa4e54caad70f543 SHA-1: 2a8850c6a6e735552c6d6c22fd90ec5fab4ff680 SHA-256: ba99082947dcb430cf8f0eaab92ec282b68c8bc5120cbf13b1068b782deacea6
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to external websites, including a known malicious redirector, disguised as game hacks and generators. The document body and heuristics indicate a lure to click these links, which likely leads to malicious content or further compromise. No scripts were extracted, but the PDF structure and embedded URLs strongly suggest a phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9865

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.online/app/406889139/free-coin-spin-daily-link-coin-master-game-hack In PDF document text
    • https://opac.umrah.ac.id/repository/mcpe-master-unlimited-coins-free-download_GM406889139.pdfIn PDF document text
    • https://opac.umrah.ac.id/repository/free-daily-spins-and-coins-for-coin-master_GM406889139.pdfIn PDF document text
    • https://opac.umrah.ac.id/repository/free-tiktok-editor_GM835599320.pdfIn PDF document text
    • https://opac.umrah.ac.id/repository/hacker-coin-master_GM406889139.pdfIn PDF document text
    • https://opac.umrah.ac.id/repository/roblox-robux-generator-no-human-verification_GM431946152.pdfIn PDF document text
    • https://opac.umrah.ac.id/repository/free-robux-codes-no-verification-2021_GM431946152.pdfIn PDF document text
    • https://opac.umrah.ac.id/repository/free-robux-websites-that-actually-work-2021_GM431946152.pdfIn PDF document text
    • https://opac.umrah.ac.id/repository/easypoints-gg-roblox_GM431946152.pdfIn PDF document text
    • https://opac.umrah.ac.id/repository/free-robux-no-verification-required_GM431946152.pdfIn PDF document text
    • https://opac.umrah.ac.id/repository/coin-master-stop-attack-hack_GM406889139.pdfIn PDF document text
    • https://opac.umrah.ac.id/repository/daily-free-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • https://opac.umrah.ac.id/repository/coin-master-free-spin-and-coins-fbid-links_GM406889139.pdfIn PDF document text
    • https://opac.umrah.ac.id/repository/minecraft-windows-10-edition-unlock-full-game-free_GM479516143.pdfIn PDF document text
    • https://opac.umrah.ac.id/repository/robux-hack-free-robux_GM431946152.pdfIn PDF document text
    • https://opac.umrah.ac.id/repository/my-minecraft-account-was-hacked_GM479516143.pdfIn PDF document text
    • https://opac.umrah.ac.id/repository/free-custom-minecraft-skins_GM479516143.pdfIn PDF document text
    • https://opac.umrah.ac.id/repository/free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • https://opac.umrah.ac.id/repository/minecraft-hacks-for-2b2t_GM479516143.pdfIn PDF document text
    • https://opac.umrah.ac.id/repository/roblox-hack-unlimited-robux_GM431946152.pdfIn PDF document text
    • https://opac.umrah.ac.id/repository/coin-master-hack-2021-without-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_off00004ece.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4ECE 24500 bytes
SHA-256: 21504f8d6bf72106c4590bf80c885667d16eea558ad667f56b5de2392441f9c6
font_01_sfnt_off0000874f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x874F 18476 bytes
SHA-256: 9d60a2e782eeb8051ddff45576a6e1a66ba7dfa86d66828505d8c060f58b239a

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