Malicious PDF — malware analysis report

Static analysis result for SHA-256 3886bda9ebc41f16…

MALICIOUS

PDF

48.0 KB Created: 2021-06-09 04:14:33 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-24
MD5: b240d4db6cbd631e9911a71a17b20c28 SHA-1: cff3658a4ca4880bbb848d9512cf1c14f0afcbbb SHA-256: 3886bda9ebc41f16b168822eaf9669e24c22cd596256e9bb818517826a6b5c53
160 Risk Score

Malware Insights

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

The PDF document contains multiple links that redirect to malicious infrastructure, specifically promoting 'game hacks' and 'free generators'. The heuristic firings indicate that these links lead to known malicious redirectors and are designed as a lure. While no scripts were explicitly extracted, the nature of the links suggests an attempt to download or execute a second-stage payload, likely exploiting a client execution vulnerability.

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/download-roblox-hack-filesblue-game-hack In PDF document text
    • http://pspmrsmbpj.com/opac/repository/free-coins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://www.pspmrsmbpj.com/opac/repository/hacks-for-coin-master_GM406889139.pdfIn PDF document text
    • http://pspmrsmbpj.com/opac/repository/free-robux-pastebin_GM431946152.pdfIn PDF document text
    • http://pspmrsmbpj.com/opac/repository/how-to-get-free-robux-2021-february_GM431946152.pdfIn PDF document text
    • http://pspmrsmbpj.com/opac/repository/best-free-roblox-outfits_GM431946152.pdfIn PDF document text
    • http://pspmrsmbpj.com/opac/repository/free-minecraft-addons_GM479516143.pdfIn PDF document text
    • http://www.pspmrsmbpj.com/opac/repository/minecraft-free-download-mac-full-version-2021_GM479516143.pdfIn PDF document text
    • http://pspmrsmbpj.com/opac/repository/hack-version-of-coin-master-apk-download_GM406889139.pdfIn PDF document text
    • http://www.pspmrsmbpj.com/opac/repository/freespinandcoin-blogspot_GM406889139.pdfIn PDF document text
    • http://pspmrsmbpj.com/opac/repository/how-to-get-free-coins-in-coin-master_GM406889139.pdfIn PDF document text
    • http://www.pspmrsmbpj.com/opac/repository/how-to-get-free-robux-2021_GM431946152.pdfIn PDF document text
    • http://pspmrsmbpj.com/opac/repository/coin-master-spin-hack_GM406889139.pdfIn PDF document text
    • http://pspmrsmbpj.com/opac/repository/free-coin-master-hacks-no-verification_GM406889139.pdfIn PDF document text
    • http://pspmrsmbpj.com/opac/repository/coin-master-daily-bonus_GM406889139.pdfIn PDF document text
    • http://pspmrsmbpj.com/opac/repository/free-coin-link-for-coin-master_GM406889139.pdfIn PDF document text
    • http://pspmrsmbpj.com/opac/repository/gold-card-coin-master-free_GM406889139.pdfIn PDF document text
    • http://pspmrsmbpj.com/opac/repository/ways-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://www.pspmrsmbpj.com/opac/repository/how-to-get-free-robux-without-verification-or-surveys_GM431946152.pdfIn PDF document text
    • http://www.pspmrsmbpj.com/opac/repository/hack-coin-master-using-cheat-engine_GM406889139.pdfIn PDF document text
    • http://www.pspmrsmbpj.com/opac/repository/free-robux-kid-friendly-no-human-verification_GM431946152.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_off00005145.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5145 25084 bytes
SHA-256: 8316e14a63d91c725d3adebfdc8ce895d5eeef69801d30a9c04dffd05204c8ad
font_01_sfnt_off00008b44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8B44 3400 bytes
SHA-256: 4b3e0f36ad1e0c7e3ea5c178fd2b4f097d1e01575fc6a4101a8b520db34dfe07
font_02_sfnt_off0000966d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x966D 19112 bytes
SHA-256: 55623af949ada25e2758a692d98c1c2b282371a38dffb85fa0abad4c54a71b76

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