Malicious PDF — malware analysis report

Static analysis result for SHA-256 1926b85c78d3dd8a…

MALICIOUS

PDF

34.3 KB Created: 2021-07-04 02:32:22 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-23
MD5: 13174602e4f59377e0b18b42e5277ac3 SHA-1: 3655148e272d090efa5483d664d909fea5bd9f8e SHA-256: 1926b85c78d3dd8ada847be8272b050d47197f5059c29ca751baf081a761cd63
200 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple lures related to game hacks and free currency generators, directing users to malicious redirectors and CAPTCHA pages. The presence of invisible and CAPTCHA-themed links, along with a critical heuristic firing for malicious redirector infrastructure, strongly suggests a phishing or malware distribution attempt. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a social engineering attack designed to lead users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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.
  • Invisible PDF links to CAPTCHA-themed web lure high PDF_CAPTCHA_LINK_LURE
    PDF contains invisible clickable link annotations that point to a CAPTCHA/capcha-themed web path. This is a common phishing and ClickFix-style routing pattern: the PDF itself is inert, while the linked page performs the credential prompt or fake verification.
  • 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/406889139/free-coin-master-cards-game-hack In PDF document text
    • https://library.iuli.ac.id/repository/robux-free-promo-codes_GM431946152.pdfIn PDF document text
    • https://library.iuli.ac.id/repository/best-free-minecraft-hacked-client_GM479516143.pdfIn PDF document text
    • https://library.iuli.ac.id/repository/get-free-robux-now_GM431946152.pdfIn PDF document text
    • https://library.iuli.ac.id/repository/guess-the-drawing-roblox-hack_GM431946152.pdfIn PDF document text
    • https://library.iuli.ac.id/repository/roblox-skywars-hack-download_GM431946152.pdfIn PDF document text
    • https://library.iuli.ac.id/repository/roblox-hack-generator-club_GM431946152.pdfIn PDF document text
    • https://library.iuli.ac.id/repository/huskybuckscom-free-robux_GM431946152.pdfIn PDF document text
    • https://library.iuli.ac.id/repository/how-to-use-cheat-engine-on-roblox-without-shutdown-2021_GM431946152.pdfIn PDF document text
    • https://library.iuli.ac.id/repository/how-to-get-free-things-on-roblox_GM431946152.pdfIn PDF document text
    • https://library.iuli.ac.id/repository/free-robux-com-real_GM431946152.pdfIn PDF document text
    • https://library.iuli.ac.id/repository/today-free-spin-coin-master_GM406889139.pdfIn PDF document text
    • https://library.iuli.ac.id/repository/hack-for-free-robux-2021_GM431946152.pdfIn PDF document text
    • https://library.iuli.ac.id/repository/coin-master-free-link_GM406889139.pdfIn PDF document text
    • https://library.iuli.ac.id/repository/how-to-hack-coin-master-spin-in-hindi_GM406889139.pdfIn PDF document text
    • https://library.iuli.ac.id/repository/swat-simulator-roblox-hack_GM431946152.pdfIn PDF document text
    • https://library.iuli.ac.id/repository/get-free-robux-without-doing-anything_GM431946152.pdfIn PDF document text
    • https://library.iuli.ac.id/repository/icebreaker-roblox-hacks_GM431946152.pdfIn PDF document text
    • https://library.iuli.ac.id/repository/roblox-game-pass-free_GM431946152.pdfIn PDF document text
    • https://library.iuli.ac.id/repository/free-robux-generator-no-survey-or-captcha_GM431946152.pdfIn PDF document text
    • https://library.iuli.ac.id/repository/roblox-cheat-engine-scripts-2021_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_off000031d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x31D7 22352 bytes
SHA-256: aad13fa194f838bc2d4408d4406a490701609ee882f4ef2a1d334f85aec87be0
font_01_sfnt_off00006382.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6382 18172 bytes
SHA-256: 2fc47c4066dd28e3547f22ef08ec611cc49326c2517731f27ce49f34897b6455

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