Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb40e2508193d97b…

MALICIOUS

PDF

34.5 KB Created: 2021-07-04 04:55:15 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 65d2469d546af2be0be73597a243c74c SHA-1: 0dc2eb18159586f4c65b307572ccd9bae06012bd SHA-256: fb40e2508193d97b0cb5968ae0a48b568cc9230375b640f94e30429b0f889262
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links, including one pointing to known malicious redirector infrastructure at http://netcdn.tw/app/406889139/free-400-spins-coin-master-game-hack. This lure, combined with the 'free generator / game hack' theme, strongly suggests a phishing or scam attempt. The document body and embedded URLs reinforce this, indicating the primary goal is to redirect users to potentially harmful sites. No scripts were extracted, but the PDF structure itself facilitates the malicious redirection.

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/406889139/free-400-spins-coin-master-game-hack In PDF document text
    • https://tena-g.hr/files/prison-life-roblox-hacks_GM431946152.pdfIn PDF document text
    • https://www.tena-g.hr/files/bloxawards-com-earn-free-robux_GM431946152.pdfIn PDF document text
    • https://www.tena-g.hr/files/free-code-roblox-card-with-no-risk_GM431946152.pdfIn PDF document text
    • https://tena-g.hr/files/how-to-get-free-robux-easy-on-android_GM431946152.pdfIn PDF document text
    • https://www.tena-g.hr/files/minecraft-fly-hack_GM479516143.pdfIn PDF document text
    • https://tena-g.hr/files/free-robux-er_GM431946152.pdfIn PDF document text
    • https://tena-g.hr/files/free-minecraft-wallpaper_GM479516143.pdfIn PDF document text
    • https://www.tena-g.hr/files/coin-master-hack-apk-35-18_GM406889139.pdfIn PDF document text
    • https://www.tena-g.hr/files/roblox-free-robux-copy-paste_GM431946152.pdfIn PDF document text
    • https://www.tena-g.hr/files/coin-master-hacker-club_GM406889139.pdfIn PDF document text
    • https://www.tena-g.hr/files/free-robux-not-fake_GM431946152.pdfIn PDF document text
    • https://www.tena-g.hr/files/juegos-para-hackear-en-roblox_GM431946152.pdfIn PDF document text
    • https://tena-g.hr/files/robuxy-com-free-robux_GM431946152.pdfIn PDF document text
    • https://www.tena-g.hr/files/coin-master-free-spin-redeem-code_GM406889139.pdfIn PDF document text
    • https://www.tena-g.hr/files/free-roblox-toy-codes-2021_GM431946152.pdfIn PDF document text
    • https://tena-g.hr/files/www-robux-cheat-us_GM431946152.pdfIn PDF document text
    • https://tena-g.hr/files/roblox-spiderman-package-full-suit-free_GM431946152.pdfIn PDF document text
    • https://tena-g.hr/files/roblox-fudz-five-ways-to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://www.tena-g.hr/files/roblox-free-robux-hack_GM431946152.pdfIn PDF document text
    • https://tena-g.hr/files/free-robux-no-verification-no-survey_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_002_off00002f82.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x2F82 23104 bytes
SHA-256: 665b6fdfcc96f6ce54a1ea5bfff5584bdceeda849939f34c902807d30e7babe7
font_01_sfnt_off0000639c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x639C 18408 bytes
SHA-256: 4e66a57bfe738047e6df63fd9189a21fbdddd8af32605bc7d5792be520b928d4

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