Malicious PDF — malware analysis report

Static analysis result for SHA-256 521ae7c369abf678…

MALICIOUS

PDF

34.8 KB Created: 2021-07-04 08:23:45 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 8edb514171e117e6e4452414f2588159 SHA-1: 438f0e466ff702ec2692176cde115afe8e890223 SHA-256: 521ae7c369abf678098a728bf87f0ce366631e1b438bc29831e9fc76847b6410
160 Risk Score

Malware Insights

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

The PDF document contains multiple links to a known malicious redirector, specifically advertising game hacks and generators. The document body and heuristics indicate a lure to download potentially unwanted or malicious software. The ML classifier also strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 http://netcdn.tw/app/479516143/how-to-download-minecraft-hacks-game-hack In PDF document text
    • http://smkn1kutaselatan.sch.id/new/public/ckfinder/userfiles/files/pubg-uc-2021_GM1330123889.pdfIn PDF document text
    • http://www.smkn1kutaselatan.sch.id/new/public/ckfinder/userfiles/files/coin-master-hack-tool-v1-9-download_GM406889139.pdfIn PDF document text
    • http://www.smkn1kutaselatan.sch.id/new/public/ckfinder/userfiles/files/free-robux-2021-no-human-verification_GM431946152.pdfIn PDF document text
    • http://www.smkn1kutaselatan.sch.id/new/public/ckfinder/userfiles/files/coin-master-mod-version-free-download-ios_GM406889139.pdfIn PDF document text
    • http://www.smkn1kutaselatan.sch.id/new/public/ckfinder/userfiles/files/free-roblox-accounts-with-robux-that-work-not-banned_GM431946152.pdfIn PDF document text
    • http://www.smkn1kutaselatan.sch.id/new/public/ckfinder/userfiles/files/coin-master-daily-free-spins-link-haktuts_GM406889139.pdfIn PDF document text
    • http://smkn1kutaselatan.sch.id/new/public/ckfinder/userfiles/files/free-links-for-free-coins-and-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://smkn1kutaselatan.sch.id/new/public/ckfinder/userfiles/files/coin-master-hack-2021-iphone_GM406889139.pdfIn PDF document text
    • http://www.smkn1kutaselatan.sch.id/new/public/ckfinder/userfiles/files/free-spins-coin-master-app_GM406889139.pdfIn PDF document text
    • http://www.smkn1kutaselatan.sch.id/new/public/ckfinder/userfiles/files/pubg-uc-price-in-pakistan_GM1330123889.pdfIn PDF document text
    • http://www.smkn1kutaselatan.sch.id/new/public/ckfinder/userfiles/files/how-to-make-sure-your-roblox-account-doesnt-get-hacked_GM431946152.pdfIn PDF document text
    • http://smkn1kutaselatan.sch.id/new/public/ckfinder/userfiles/files/roblox-hackfree-robux-and-membership-hackaron_GM431946152.pdfIn PDF document text
    • http://smkn1kutaselatan.sch.id/new/public/ckfinder/userfiles/files/coin-master-free-spins-hack-apk-download_GM406889139.pdfIn PDF document text
    • http://www.smkn1kutaselatan.sch.id/new/public/ckfinder/userfiles/files/free-robux-generator-2021_GM431946152.pdfIn PDF document text
    • http://www.smkn1kutaselatan.sch.id/new/public/ckfinder/userfiles/files/minecraft-gun-games-free_GM479516143.pdfIn PDF document text
    • http://www.smkn1kutaselatan.sch.id/new/public/ckfinder/userfiles/files/coin-master-free-coins-2021_GM406889139.pdfIn PDF document text
    • http://www.smkn1kutaselatan.sch.id/new/public/ckfinder/userfiles/files/coin-master-free-pet-food_GM406889139.pdfIn PDF document text
    • http://www.smkn1kutaselatan.sch.id/new/public/ckfinder/userfiles/files/free-admin-roblox-any-game_GM431946152.pdfIn PDF document text
    • http://www.smkn1kutaselatan.sch.id/new/public/ckfinder/userfiles/files/how-to-get-unlimited-xp-in-pokemon-go_GM1094591345.pdfIn PDF document text
    • http://www.smkn1kutaselatan.sch.id/new/public/ckfinder/userfiles/files/robux-free-infini_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_off000032c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x32C1 22432 bytes
SHA-256: 1393afa07de30deeb68abb9aba2a54657b6e2590914cfc40a849ee18c668b678
font_01_sfnt_off000063eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x63EB 18748 bytes
SHA-256: d3c6952994d6e24d3bacf5184ddbc3a45400015c11867e6fcafaa525ffd68a7f

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