Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c1c7ed17169b9a7…

MALICIOUS

PDF

34.8 KB Created: 2021-07-05 10:53:20 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-14
MD5: e6fbfb3a7720374766383bd5b799fbb2 SHA-1: c6e31dcc8bed89444552debeb7f3f1d91fbde9bf SHA-256: 7c1c7ed17169b9a7403a8913a5a167825642fd181f34f7a77209b3045fbc11a9
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links to known malicious redirectors and scam-related content, specifically targeting users seeking 'free Robux' or 'game hacks'. The presence of these links, combined with the ML classifier flagging it as malicious, strongly indicates a phishing or scam attempt designed to lead users to potentially harmful websites. No scripts were extracted, but the document's structure and embedded URLs point towards a social engineering attack.

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/431946152/how-to-get-free-robux-without-human-verification-game-hack In PDF document text
    • http://cintabaca.org/katalog//repository/coin-master-free-spins-link-2021-hack_GM406889139.pdfIn PDF document text
    • http://cintabaca.org/katalog//repository/how-to-get-free-robux-com_GM431946152.pdfIn PDF document text
    • http://cintabaca.org/katalog/repository/roblox-jailbreak-hack_GM431946152.pdfIn PDF document text
    • http://cintabaca.org/katalog/repository/roblox-robux-hack-free-generator_GM431946152.pdfIn PDF document text
    • http://cintabaca.org/katalog/repository/como-hackear-roblox-robux-gratis_GM431946152.pdfIn PDF document text
    • http://cintabaca.org/katalog/repository/coin-master-hacks-xyz_GM406889139.pdfIn PDF document text
    • http://cintabaca.org/katalog/repository/how-to-get-free-money-in-mad-city-roblox_GM431946152.pdfIn PDF document text
    • http://cintabaca.org/katalog/repository/coin-master-free-coins-and-spins-2021_GM406889139.pdfIn PDF document text
    • http://cintabaca.org/katalog/repository/roblox-get-free-online_GM431946152.pdfIn PDF document text
    • http://cintabaca.org/katalog/repository/free-spins-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://cintabaca.org/katalog//repository/coin-master-hack-club_GM406889139.pdfIn PDF document text
    • http://cintabaca.org/katalog//repository/www-coin-master_GM406889139.pdfIn PDF document text
    • http://cintabaca.org/katalog/repository/how-to-change-a-name-in-roblox-for-free-2021_GM431946152.pdfIn PDF document text
    • http://cintabaca.org/katalog/repository/roblox-login-hack_GM431946152.pdfIn PDF document text
    • http://cintabaca.org/katalog/repository/how-to-get-free-roblox-gift-card-codes-2021_GM431946152.pdfIn PDF document text
    • http://cintabaca.org/katalog/repository/coin-master-free-spins-no-generator_GM406889139.pdfIn PDF document text
    • http://cintabaca.org/katalog//repository/free-roblox-outfits_GM431946152.pdfIn PDF document text
    • http://cintabaca.org/katalog/repository/youtube-roblox-broken-bones-cheat_GM431946152.pdfIn PDF document text
    • http://cintabaca.org/katalog//repository/how-to-get-minecraft-for-free-on-tablet_GM479516143.pdfIn PDF document text
    • http://cintabaca.org/katalog//repository/daily-free-spins-coin-master_GM406889139.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_off00003113.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3113 21736 bytes
SHA-256: 01d73ef429f32c939394ebdd2a7d2f4a1e18a2205ce1a83ac9e771247e1ebb71
font_01_sfnt_off00006090.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6090 19860 bytes
SHA-256: 495fe8ab67ccc92980b130970b14ca59a4055a895de5252c8ccba287623abf67

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