Malicious PDF — malware analysis report

Static analysis result for SHA-256 385d5f007ca274be…

MALICIOUS

PDF

49.5 KB Created: 2021-06-07 05:14:30 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-24
MD5: 0807f8d4bb57cec44849097653d0cfea SHA-1: b7a42186a0451b224743f5f7bed32323ec5d830f SHA-256: 385d5f007ca274bea60f97499c651bcb4b0a689796dee9cb5dc2fd8505a7ce87
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a lure for free game currency, directing users to a malicious redirector URL. The document body and embedded links suggest a scam aimed at tricking users into visiting potentially harmful sites. While no scripts were explicitly extracted, the PDF structure and embedded URLs indicate a malicious intent to redirect users to malicious infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9796

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.tw/app/431946152/free-robux-advert-game-hack In PDF document text
    • http://library.fikes.upnvj.ac.id/repository/free-minecraft-website_GM479516143.pdfIn PDF document text
    • http://library.fikes.upnvj.ac.id/repository/free-spins-coins-coin-master_GM406889139.pdfIn PDF document text
    • http://library.fikes.upnvj.ac.id/repository/can-you-download-minecraft-for-free_GM479516143.pdfIn PDF document text
    • http://library.fikes.upnvj.ac.id/repository/coin-master-free-spins-link-2021_GM406889139.pdfIn PDF document text
    • http://library.fikes.upnvj.ac.id/repository/coin-master-free-coins-amp_GM406889139.pdfIn PDF document text
    • http://library.fikes.upnvj.ac.id/repository/minecraft-free-download-no-virus_GM479516143.pdfIn PDF document text
    • http://library.fikes.upnvj.ac.id/repository/free-roblox-accessories_GM431946152.pdfIn PDF document text
    • http://library.fikes.upnvj.ac.id/repository/is-there-a-way-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://library.fikes.upnvj.ac.id/repository/how-to-get-free-robux-easy-hack_GM431946152.pdfIn PDF document text
    • http://library.fikes.upnvj.ac.id/repository/free-spin-link-for-coin-master_GM406889139.pdfIn PDF document text
    • http://library.fikes.upnvj.ac.id/repository/coin-master-free-spins-link-2021-april_GM406889139.pdfIn PDF document text
    • http://library.fikes.upnvj.ac.id/repository/games-in-roblox-that-give-you-robux_GM431946152.pdfIn PDF document text
    • http://library.fikes.upnvj.ac.id/repository/wurst-hacked-client-112-2_GM479516143.pdfIn PDF document text
    • http://library.fikes.upnvj.ac.id/repository/robux-fun-hack_GM431946152.pdfIn PDF document text
    • http://library.fikes.upnvj.ac.id/repository/free-roblox-printables_GM431946152.pdfIn PDF document text
    • http://library.fikes.upnvj.ac.id/repository/how-to-get-free-robux-without-human-verification_GM431946152.pdfIn PDF document text
    • http://library.fikes.upnvj.ac.id/repository/minecraft-bedrock-free-download-pc_GM479516143.pdfIn PDF document text
    • http://library.fikes.upnvj.ac.id/repository/free-robux-2021_GM431946152.pdfIn PDF document text
    • http://library.fikes.upnvj.ac.id/repository/coin-master-links-for-free-spins-2021_GM406889139.pdfIn PDF document text
    • http://library.fikes.upnvj.ac.id/repository/coin-master-hack-september-2021_GM406889139.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
stream_004_off00005452.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5452 27500 bytes
SHA-256: 1a9b52247e52be50d3dde89670a641fb72ba6a7b9ab39c076ffb6035c01f5a23
font_01_sfnt_off000094a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x94A3 2876 bytes
SHA-256: 0f99604d55dac6626711b4d750768ca349af54a6e3d7fe8709188b59b2479d46
font_02_sfnt_off00009e8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9E8C 18408 bytes
SHA-256: 4cc9a6c4b09999cf38e600525008155406b036b1a1f77a4e3265c596bf694e0e

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