Malicious PDF — malware analysis report

Static analysis result for SHA-256 449169ff2f5d5a9b…

MALICIOUS

PDF

35.1 KB Created: 2021-07-04 09:23:21 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-08-25
MD5: b8c19a05c889e60dab62885c4fb71def SHA-1: 00cfa87e73a32d1db74d39f839cd3628b031175a SHA-256: 449169ff2f5d5a9ba787b747ff8318516d39d6013e384ae64c124327eb5d2c43
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains multiple heuristics indicating it's a malicious redirector, specifically targeting users interested in game hacks and free currency like Robux. The document body and embedded URLs point to a known malicious redirector infrastructure at http://netcdn.tw/app/431946152/free-robux-game-hack, which is designed to lure users into clicking malicious links. No scripts were extracted, but the overall pattern suggests a phishing or scam attempt.

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/free-robux-game-hack In PDF document text
    • https://www.serraw.com/uploaded_files/userfiles/files/software-for-cheat-engine-66-to-not-make-roblox-crash_GM431946152.pdfIn PDF document text
    • https://www.serraw.com/uploaded_files/userfiles/files/cat-ears-roblox-free_GM431946152.pdfIn PDF document text
    • https://www.serraw.com/uploaded_files/userfiles/files/earn-free-robux-easy_GM431946152.pdfIn PDF document text
    • https://www.serraw.com/uploaded_files/userfiles/files/coin-master-15-free-spin-link-of-last-5-days_GM406889139.pdfIn PDF document text
    • https://www.serraw.com/uploaded_files/userfiles/files/change-roblox-username-free_GM431946152.pdfIn PDF document text
    • https://www.serraw.com/uploaded_files/userfiles/files/rich-free-roblox-accounts_GM431946152.pdfIn PDF document text
    • https://www.serraw.com/uploaded_files/userfiles/files/free-robux-pastebin_GM431946152.pdfIn PDF document text
    • https://www.serraw.com/uploaded_files/userfiles/files/original-roblox_GM431946152.pdfIn PDF document text
    • https://www.serraw.com/uploaded_files/userfiles/files/coin-master-free-spins-link-2021_GM406889139.pdfIn PDF document text
    • https://www.serraw.com/uploaded_files/userfiles/files/fashion-frenzy-roblox-game-free-download_GM431946152.pdfIn PDF document text
    • https://www.serraw.com/uploaded_files/userfiles/files/hack-de-game-pass-para-horse-world-roblox_GM431946152.pdfIn PDF document text
    • https://www.serraw.com/uploaded_files/userfiles/files/roblox-account-pin-hack_GM431946152.pdfIn PDF document text
    • https://www.serraw.com/uploaded_files/userfiles/files/card-hack-in-coin-master_GM406889139.pdfIn PDF document text
    • https://www.serraw.com/uploaded_files/userfiles/files/hack-coin-master-343-apk_GM406889139.pdfIn PDF document text
    • https://www.serraw.com/uploaded_files/userfiles/files/best-free-roblox-outfits_GM431946152.pdfIn PDF document text
    • https://www.serraw.com/uploaded_files/userfiles/files/free-robux-please_GM431946152.pdfIn PDF document text
    • https://www.serraw.com/uploaded_files/userfiles/files/coin-master-free-spin-software_GM406889139.pdfIn PDF document text
    • https://www.serraw.com/uploaded_files/userfiles/files/roblox-troll-outfits-free_GM431946152.pdfIn PDF document text
    • https://www.serraw.com/uploaded_files/userfiles/files/roblox-dbor-how-to-hack-levels_GM431946152.pdfIn PDF document text
    • https://www.serraw.com/uploaded_files/userfiles/files/roblox-jailbreak-speed-hack-codes_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
font_00_sfnt_off0000324c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x324C 22908 bytes
SHA-256: 2b87b1a526e004bc541da748d77877c130cccfac77ec0ef0cc64ff17a5544289
font_01_sfnt_off00006507.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6507 18716 bytes
SHA-256: ae86725dd70d168e8b5a24377d7effb3bd88f81667aa3e091abc0f5759eb354b

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