Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8d7978b416de116…

MALICIOUS

PDF

35.1 KB Created: 2021-07-04 03:31:16 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 7ec9dfe3228082460d8659103cca024b SHA-1: 757fb1d8d3da681153f73173e3dd234031839176 SHA-256: d8d7978b416de1169739333479768e0aea90142f01719c24b6dcacef1bc65b8f
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document contains multiple links to redirector infrastructure, specifically advertising free Robux or game hacks. The primary link, http://netcdn.tw/app/431946152/is-there-any-way-to-get-free-robux-game-hack, is flagged as a malicious redirector. The document body and embedded URLs suggest a lure for users seeking in-game currency, which is a common tactic for phishing or malware distribution.

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/is-there-any-way-to-get-free-robux-game-hack In PDF document text
    • https://ourlady-elearning.com/userfiles/files/how-to-get-free-robux-hack-2021_GM431946152.pdfIn PDF document text
    • https://ourlady-elearning.com/userfiles/files/coin-master-free-daily-spins-link_GM406889139.pdfIn PDF document text
    • https://ourlady-elearning.com/userfiles/files/pastebincom-free-robux-code_GM431946152.pdfIn PDF document text
    • https://ourlady-elearning.com/userfiles/files/easy-way-to-get-robux_GM431946152.pdfIn PDF document text
    • https://ourlady-elearning.com/userfiles/files/free-robux-no-verification-or-survey-2021_GM431946152.pdfIn PDF document text
    • https://ourlady-elearning.com/userfiles/files/free-spin-coin-master-link-2021_GM406889139.pdfIn PDF document text
    • https://ourlady-elearning.com/userfiles/files/tiktok-comments-free_GM835599320.pdfIn PDF document text
    • https://ourlady-elearning.com/userfiles/files/free-robux-ad_GM431946152.pdfIn PDF document text
    • https://ourlady-elearning.com/userfiles/files/free-daily-spins-coin-master_GM406889139.pdfIn PDF document text
    • https://ourlady-elearning.com/userfiles/files/coin-master-hack-2021_GM406889139.pdfIn PDF document text
    • https://ourlady-elearning.com/userfiles/files/free-roblox-accounts-2021_GM431946152.pdfIn PDF document text
    • https://ourlady-elearning.com/userfiles/files/roblox-adopt-me-money-hack_GM431946152.pdfIn PDF document text
    • https://ourlady-elearning.com/userfiles/files/how-to-hack-roblox-with-roblox-plus_GM431946152.pdfIn PDF document text
    • https://ourlady-elearning.com/userfiles/files/roblox36com-free-robux_GM431946152.pdfIn PDF document text
    • https://ourlady-elearning.com/userfiles/files/rbx-gg-free-robux_GM431946152.pdfIn PDF document text
    • https://ourlady-elearning.com/userfiles/files/coin-master-no-download-app-but-play-for-free_GM406889139.pdfIn PDF document text
    • https://ourlady-elearning.com/userfiles/files/coin-master-stop-attack-hack_GM406889139.pdfIn PDF document text
    • https://ourlady-elearning.com/userfiles/files/coin-master-100-free-spins-link_GM406889139.pdfIn PDF document text
    • https://ourlady-elearning.com/userfiles/files/free-coins-and-spins-in-coin-master_GM406889139.pdfIn PDF document text
    • https://ourlady-elearning.com/userfiles/files/pokemon-go-free-coins-hack-2021_GM1094591345.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_off000030e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x30E6 22500 bytes
SHA-256: 4e9c7a7045c480ab0a67cc34cdc44933d548cd90ee490574359f6e0911536f50
font_01_sfnt_off00006343.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6343 19364 bytes
SHA-256: 80b6394bfb37edc2ea14afbfa24f605699f6492fbe141c801abd30e44507c20a

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