Malicious PDF — malware analysis report

Static analysis result for SHA-256 d285766a56edfa38…

MALICIOUS

PDF

45.9 KB Created: 2021-06-03 13:21:06 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-16
MD5: b947989842a0fd201f48417846356ce5 SHA-1: e9c39bce9d2dd6a499a4cdab499c5991998db300 SHA-256: d285766a56edfa3862d5700f94dcb53368a1751cbef49dfd48c44ba505db6379
200 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF document contains embedded links that redirect to malicious infrastructure, specifically promoting a "free generator / game hack" lure. The 'SE_CLICKFIX' heuristic indicates the document likely instructs the user to press Win+R or paste a command, a common social engineering tactic to bypass security measures. The ML classifier also flagged this PDF as malicious with high confidence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9864

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.
  • ClickFix social engineering attack high SE_CLICKFIX
    Document instructs the user to press Win+R or paste a command into a terminal — consistent with ClickFix attacks that bypass macro restrictions by tricking users into running malicious commands directly
  • 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/479516143/minecraft-java-for-free-game-hack In PDF document text
    • https://library.sman1berau.sch.id/repository/free-spins-coin-master-2021-hack_GM406889139.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/legit-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/coin-master-pc-hack-tool_GM406889139.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/minecraft-ps4-free_GM479516143.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/www-roblox-com-robux-free_GM431946152.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/free-robux-gift-card-codes-2021_GM431946152.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/coin-master-hack-without-human-verification_GM406889139.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/free-robux-hack-no-human-verification-or-survey_GM431946152.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/claimrbx-free-robux_GM431946152.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/tiktok-free-download-for-windows-10_GM835599320.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/coinmaster-fan-page_GM406889139.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/pokemon-go-free-battle-pass_GM1094591345.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/free-robux-no-human-verification-or-survey-2021_GM431946152.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/coin-master-daily-free-spins-blog_GM406889139.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/hacks-para-roblox_GM431946152.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/free-spin-link-for-coin-master-game_GM406889139.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/free-robux-websites-that-actually-work_GM431946152.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/coin-master-free-coins-link-2021_GM406889139.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/coin-master-free-spins-gratis_GM406889139.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/master-coin-free-spin_GM406889139.pdfIn PDF document text
    • https://youtuIn 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_off000056c4.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x56C4 26236 bytes
SHA-256: da4fac73bebe472324563f8a2f83cd65e404b55a93f30b9783cb3d43c3824b47
font_01_sfnt_off000091cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x91CB 17992 bytes
SHA-256: 877a408be013f078917fd76a4bbe40e25113e750108d1b6ebc83b07ab96d646a

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