Malicious PDF — malware analysis report

Static analysis result for SHA-256 621eae15e7dbef54…

MALICIOUS

PDF

34.4 KB Created: 2021-07-09 04:43:41 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 6512791695005041e87d9dfa412f758b SHA-1: f0bcea83b2481d407a1fb4a7f17c974533d7d131 SHA-256: 621eae15e7dbef54dcab7534b278b7be653b96af96f8d0cb23ef15104bbb6d06
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, including a critical redirector link to 'netcdn.tw', which is associated with malicious activity. The document body and heuristics indicate a lure for free Robux or game hacks, a common social engineering tactic. While no scripts were explicitly extracted, the PDF structure and embedded links suggest it's designed to redirect users to potentially malicious sites, likely as part of a phishing or scam campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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/free-robux-no-human-verification-and-no-survey-game-hack In PDF document text
    • https://traveljogja.net/ckfinder/userfiles/files/how-to-get-free-robux-without-downloading-apps_GM431946152.pdfIn PDF document text
    • https://traveljogja.net/ckfinder/userfiles/files/how-to-get-free-robux-100-real-pc_GM431946152.pdfIn PDF document text
    • https://traveljogja.net/ckfinder/userfiles/files/roblox-free-body_GM431946152.pdfIn PDF document text
    • https://traveljogja.net/ckfinder/userfiles/files/coin-master-heaven-free-spins-link-2021_GM406889139.pdfIn PDF document text
    • https://traveljogja.net/ckfinder/userfiles/files/minecraft-free-download-windows-10_GM479516143.pdfIn PDF document text
    • https://traveljogja.net/ckfinder/userfiles/files/minecraft-realms-free-trial_GM479516143.pdfIn PDF document text
    • https://traveljogja.net/ckfinder/userfiles/files/free-spins-generated-from-coin-master_GM406889139.pdfIn PDF document text
    • https://traveljogja.net/ckfinder/userfiles/files/coin-master-hack-ios-2021_GM406889139.pdfIn PDF document text
    • https://traveljogja.net/ckfinder/userfiles/files/how-do-you-get-free-robux-on-a-phone_GM431946152.pdfIn PDF document text
    • https://traveljogja.net/ckfinder/userfiles/files/how-to-buy-robux-for-free_GM431946152.pdfIn PDF document text
    • https://traveljogja.net/ckfinder/userfiles/files/roblox-cheats-to-get-robux_GM431946152.pdfIn PDF document text
    • https://traveljogja.net/ckfinder/userfiles/files/free-old-roblox-accounts-2021_GM431946152.pdfIn PDF document text
    • https://traveljogja.net/ckfinder/userfiles/files/how-to-sell-a-shirt-for-free-on-roblox_GM431946152.pdfIn PDF document text
    • https://traveljogja.net/ckfinder/userfiles/files/minecraft-free-online_GM479516143.pdfIn PDF document text
    • https://traveljogja.net/ckfinder/userfiles/files/how-to-get-free-robux-no-human-verification-2021_GM431946152.pdfIn PDF document text
    • https://traveljogja.net/ckfinder/userfiles/files/free-spin-hack-coin-master-2021_GM406889139.pdfIn PDF document text
    • https://traveljogja.net/ckfinder/userfiles/files/free-robux-codes-no-human-verification_GM431946152.pdfIn PDF document text
    • https://traveljogja.net/ckfinder/userfiles/files/free-coin-master-spins-without-human-verification_GM406889139.pdfIn PDF document text
    • https://traveljogja.net/ckfinder/userfiles/files/https-growbux-net-free-robux_GM431946152.pdfIn PDF document text
    • https://traveljogja.net/ckfinder/userfiles/files/how-to-hack-a-roblox-account-easy_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_off00002e21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2E21 22184 bytes
SHA-256: 4fbc2e388a83899bb0c21c57b18caf70d92f750f4506fe6906fd2638b49996b9
font_01_sfnt_off00005ef0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5EF0 19800 bytes
SHA-256: fcd4d125090859beb8b270f882485097339e29693181c3776c14839bc9dcd643

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