Malicious PDF — malware analysis report

Static analysis result for SHA-256 12f7ba80ba909417…

MALICIOUS

PDF

35.4 KB Created: 2021-07-02 06:44:50 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-15
MD5: c204410302b4b5b9a931fa15e81fb7d7 SHA-1: 981570a7eec74394e772f171850b04b82d646806 SHA-256: 12f7ba80ba909417facf479e20a30acbbb643a5a502dc097d456c44aa2a47ab3
142 Risk Score

Malware Insights

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

The PDF document contains numerous links to external websites, many of which are SEO-optimized and related to game hacks and in-game currency. The document body explicitly mentions "How To Get Free Robux Simple And Easy" and includes a URL that appears to be a direct download or landing page. The presence of a "Password-protected archive handoff" heuristic suggests that the linked content may be an archive requiring a password, often used to bypass security scanners. The ML classifier also flagged this PDF as malicious with high confidence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 5

  • 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.
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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.co/app/431946152/how-to-get-free-robux-simple-and-easy-game-hack PDF link annotation
    • http://smkn1salatiga.sch.id/library/repository/offers-to-complete-and-get-free-spins-in-coin-master_GM406889139.pdfIn PDF document text
    • http://smkn1salatiga.sch.id/library/repository/free-minecraft-capes-no-mods_GM479516143.pdfIn PDF document text
    • http://smkn1salatiga.sch.id/library/repository/how-to-get-free-coins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://smkn1salatiga.sch.id/library/repository/free-minecraft-server_GM479516143.pdfIn PDF document text
    • http://smkn1salatiga.sch.id/library/repository/pubg-uc-low-price_GM1330123889.pdfIn PDF document text
    • http://smkn1salatiga.sch.id/library/repository/how-do-u-hack-roblox_GM431946152.pdfIn PDF document text
    • http://smkn1salatiga.sch.id/library/repository/coin-master-get-free-spins_GM406889139.pdfIn PDF document text
    • http://smkn1salatiga.sch.id/library/repository/free-robux-pastebin-no-subscribe-2021_GM431946152.pdfIn PDF document text
    • http://smkn1salatiga.sch.id/library/repository/get-me-robux-for-free_GM431946152.pdfIn PDF document text
    • http://smkn1salatiga.sch.id/library/repository/coin-master-free-spins-8-14-2021_GM406889139.pdfIn PDF document text
    • http://smkn1salatiga.sch.id/library/repository/coin-master-free-spins-promo-code_GM406889139.pdfIn PDF document text
    • http://smkn1salatiga.sch.id/library/repository/roblox-unlimited-health-hack_GM431946152.pdfIn PDF document text
    • http://smkn1salatiga.sch.id/library/repository/get-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://smkn1salatiga.sch.id/library/repository/how-to-hack-roblox_GM431946152.pdfIn PDF document text
    • http://smkn1salatiga.sch.id/library/repository/how-to-hack-peoples-password-on-roblox_GM431946152.pdfIn PDF document text
    • http://smkn1salatiga.sch.id/library/repository/roblox-hacount-hack_GM431946152.pdfIn PDF document text
    • http://smkn1salatiga.sch.id/library/repository/rbxfree-com-free-robux_GM431946152.pdfIn PDF document text
    • http://smkn1salatiga.sch.id/library/repository/coin-master-free-spins-link-today-hack_GM406889139.pdfIn PDF document text
    • http://smkn1salatiga.sch.id/library/repository/roblox-hack-reason-2-die_GM431946152.pdfIn PDF document text
    • http://smkn1salatiga.sch.id/library/repository/roblox-why-free-clothes-are-unavailable_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
stream_002_off000030a8.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x30A8 22388 bytes
SHA-256: a6b64a7e1b38aef3a47216db167017598e47c8bfc2a567e7a63f65ff69e7b20c
font_01_sfnt_off00006285.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6285 19968 bytes
SHA-256: 2f62d1d2342988cf4d781bbdea843319f05265a4353c00c7c7f4691966597c21

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