Malicious PDF — malware analysis report

Static analysis result for SHA-256 db072762aa848439…

MALICIOUS

PDF

35.2 KB Created: 2021-07-05 09:46:06 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 8e080b5214215b84d7c16af17ccebb2d SHA-1: 4a31c1a7d2b23d24a85cd1ba130fedf12e53569b SHA-256: db072762aa8484395542228228ca824b1238bff41ce5965b5f1a6ac04455279f
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document contains numerous links to external resources, including a known malicious redirector at http://netcdn.tw/app/406889139/spinuri-gratis-coin-master-game-hack. The document body and heuristics indicate a lure for 'free generators' and 'game hacks', suggesting a phishing or scam attempt. The presence of multiple PDF links further supports the classification as a link farm designed to drive traffic to potentially malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 http://netcdn.tw/app/406889139/spinuri-gratis-coin-master-game-hack In PDF document text
    • http://perpustakaan.ipts.ac.id/repository/free-robux-generator_GM431946152.pdfIn PDF document text
    • http://perpustakaan.ipts.ac.id/repository/get-free-robux-without-human-verification_GM431946152.pdfIn PDF document text
    • http://perpustakaan.ipts.ac.id/repository/latest-roblox-hacks-2021_GM431946152.pdfIn PDF document text
    • http://perpustakaan.ipts.ac.id/repository/roblox-super-jump-hack-cheat-engine_GM431946152.pdfIn PDF document text
    • http://perpustakaan.ipts.ac.id/repository/youtube-fly-hack-roblox-2021-feb_GM431946152.pdfIn PDF document text
    • http://perpustakaan.ipts.ac.id/repository/www-roblox-com-free-robux_GM431946152.pdfIn PDF document text
    • http://perpustakaan.ipts.ac.id/repository/free-key-cards-roblox_GM431946152.pdfIn PDF document text
    • http://perpustakaan.ipts.ac.id/repository/roblox-hack-khol-admin-perm_GM431946152.pdfIn PDF document text
    • http://perpustakaan.ipts.ac.id/repository/what-is-the-the-robux-hack-command_GM431946152.pdfIn PDF document text
    • http://perpustakaan.ipts.ac.id/repository/free-minecraft-resource-packs_GM479516143.pdfIn PDF document text
    • http://perpustakaan.ipts.ac.id/repository/how-to-hack-roblox-for-robux_GM431946152.pdfIn PDF document text
    • http://perpustakaan.ipts.ac.id/repository/get-free-spins-on-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://perpustakaan.ipts.ac.id/repository/how-to-hack-robux-2021-may_GM431946152.pdfIn PDF document text
    • http://perpustakaan.ipts.ac.id/repository/free-robux-hack-no-human-verification_GM431946152.pdfIn PDF document text
    • http://perpustakaan.ipts.ac.id/repository/free-download-roblox-for-windows-10_GM431946152.pdfIn PDF document text
    • http://perpustakaan.ipts.ac.id/repository/minecraft-windows-free_GM479516143.pdfIn PDF document text
    • http://perpustakaan.ipts.ac.id/repository/free-to-use-roblox-ads_GM431946152.pdfIn PDF document text
    • http://perpustakaan.ipts.ac.id/repository/best-minecraft-hacks_GM479516143.pdfIn PDF document text
    • http://perpustakaan.ipts.ac.id/repository/hawt-sauce-roblox-hack-download_GM431946152.pdfIn PDF document text
    • http://perpustakaan.ipts.ac.id/repository/como-hackear-cuentas-de-roblox-sin-contrasea_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
font_00_sfnt_off000032b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x32B1 23280 bytes
SHA-256: a0377bd4839b3adc1f0be684f0a4f0384ee4e8860e8e0d0b0736d937f23db1fc
font_01_sfnt_off00006721.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6721 18152 bytes
SHA-256: a6076e1b303454bb30c70a8673d91eb0bd319a08e3fc25c4d679c7bcf2342b8b

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