Malicious PDF — malware analysis report

Static analysis result for SHA-256 a73eefce31c3ea45…

MALICIOUS

PDF

34.5 KB Created: 2021-07-05 22:20:03 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 592d5f9ff7b5bc383dde13d513206954 SHA-1: 5ce11061e5af876210eccd0005bdb26cad903b57 SHA-256: a73eefce31c3ea45d5f7a2fc7e571d89548ca4cf9bc1aec4600265ca784835ee
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links designed to lure users into clicking on what appears to be a 'free Robux' generator or game hack. These links redirect to malicious infrastructure, indicating a phishing or scam attempt. The presence of numerous SEO-optimized PDF links further suggests an attempt to distribute malicious content broadly. No scripts were extracted from this sample.

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.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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/claim-free-robux-button-game-hack In PDF document text
    • http://lib.untad.ac.id/repository/blogger-free-spins-and-coins_GM406889139.pdfIn PDF document text
    • http://lib.untad.ac.id/repository/fan-page-coin-master_GM406889139.pdfIn PDF document text
    • http://lib.untad.ac.id/repository/get-back-my-hacked-account-roblox_GM431946152.pdfIn PDF document text
    • http://lib.untad.ac.id/repository/su-tart-sad-story-free-mod-roblox_GM431946152.pdfIn PDF document text
    • http://lib.untad.ac.id//repository/how-to-get-2021-robux-for-free_GM431946152.pdfIn PDF document text
    • http://lib.untad.ac.id/repository/how-to-earn-robux-fast_GM431946152.pdfIn PDF document text
    • http://lib.untad.ac.id/repository/get-free-robux-in-roblox-2021_GM431946152.pdfIn PDF document text
    • http://lib.untad.ac.id/repository/free-robux-easy-for-kids-fof-noobs_GM431946152.pdfIn PDF document text
    • http://lib.untad.ac.id/repository/free-vip-server-roblox_GM431946152.pdfIn PDF document text
    • http://lib.untad.ac.id/repository/hack-to-get-1-billion-robux-in-roblox_GM431946152.pdfIn PDF document text
    • http://lib.untad.ac.id/repository/roblox-how-to-hack-prison-life-202-2021_GM431946152.pdfIn PDF document text
    • http://lib.untad.ac.id/repository/mcpe-master-coin-hack-apk_GM406889139.pdfIn PDF document text
    • http://lib.untad.ac.id/repository/neon-hacks-roblox-account-generator_GM431946152.pdfIn PDF document text
    • http://lib.untad.ac.id/repository/get-minecraft-windows-10-free_GM479516143.pdfIn PDF document text
    • http://lib.untad.ac.id/repository/youtube-how-to-hack-free-robux-using-pastebin_GM431946152.pdfIn PDF document text
    • http://lib.untad.ac.id/repository/free-robux-without-survey-or-verification_GM431946152.pdfIn PDF document text
    • http://lib.untad.ac.id/repository/free-spins-coin-master-links_GM406889139.pdfIn PDF document text
    • http://lib.untad.ac.id/repository/hacks-for-roblox-murder-mystery-2_GM431946152.pdfIn PDF document text
    • http://lib.untad.ac.id/repository/free-robux-glitch-2021_GM431946152.pdfIn PDF document text
    • http://lib.untad.ac.id/repository/unlimited-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_off0000300f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x300F 22224 bytes
SHA-256: c5088db6eb223d146cdf6cc5c34c5837f76c6c6f4e9193cb1abcdecbc5ec51a1
font_01_sfnt_off0000616f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x616F 19276 bytes
SHA-256: 5ca6afd9ef6654ecee97696be31186890f5d02b6a4e0562937dffc5a9068c4b8

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