Malicious PDF — malware analysis report

Static analysis result for SHA-256 b2de830f37b9ecb8…

MALICIOUS

PDF

34.1 KB Created: 2021-07-09 21:21:48 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 2b58a82c8ebd51516d66eb94b67a130a SHA-1: 28c624f5970a76cbc3e9c25226a8fee7d4b5ebf2 SHA-256: b2de830f37b9ecb886a3f83a4895cae77a82931d73547b53a254c2b1d1e0fe0c
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links, including one to 'netcdn.tw', which is identified as a malicious redirector. The document body explicitly mentions 'Free Robux With No Verification' and includes numerous URLs related to game hacks and free currency, indicating a phishing or scam lure. The presence of embedded URLs and the ML classifier's high confidence score support this assessment.

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-with-no-verification-game-hack In PDF document text
    • https://www.mb-alati.hr/files/coin-master-free-spins-hack_GM406889139.pdfIn PDF document text
    • https://www.mb-alati.hr/files/free-minecraft-printables-food-labels_GM479516143.pdfIn PDF document text
    • http://mb-alati.hr/files/free-robux-without-survey_GM431946152.pdfIn PDF document text
    • https://www.mb-alati.hr/files/free-robux-no-survey-or-human-verification_GM431946152.pdfIn PDF document text
    • https://www.mb-alati.hr/files/how-do-you-earn-robux-in-roblox-for-free_GM431946152.pdfIn PDF document text
    • http://mb-alati.hr/files/free-robux-glitch-2021_GM431946152.pdfIn PDF document text
    • http://mb-alati.hr/files/has-roblox-been-hacked-2021_GM431946152.pdfIn PDF document text
    • http://mb-alati.hr/files/free-animations-roblox-catalog_GM431946152.pdfIn PDF document text
    • https://www.mb-alati.hr/files/how-to-get-minecraft-on-chromebook-for-free_GM479516143.pdfIn PDF document text
    • http://mb-alati.hr/files/is-minecraft-vr-free_GM479516143.pdfIn PDF document text
    • http://mb-alati.hr/files/john-doe-roblox-hacker_GM431946152.pdfIn PDF document text
    • https://www.mb-alati.hr/files/free-modded-minecraft-server_GM479516143.pdfIn PDF document text
    • https://www.mb-alati.hr/files/how-to-get-free-robux-no-human-verification_GM431946152.pdfIn PDF document text
    • http://mb-alati.hr/files/roblox-hack-unlimited-robux_GM431946152.pdfIn PDF document text
    • https://www.mb-alati.hr/files/free-robux-no-survey-2021-android_GM431946152.pdfIn PDF document text
    • http://mb-alati.hr/files/free-stuff-on-roblox_GM431946152.pdfIn PDF document text
    • https://www.mb-alati.hr/files/free-robux-hack-no-human-verification_GM431946152.pdfIn PDF document text
    • https://www.mb-alati.hr/files/coin-master-link-daily-get-free-spins-and-coins_GM406889139.pdfIn PDF document text
    • http://mb-alati.hr/files/oprewards-com-earn_GM431946152.pdfIn PDF document text
    • https://www.mb-alati.hr/files/hack-server-vip-robux-gratis_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_off00002e6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2E6E 21912 bytes
SHA-256: ca43a09a9e025ac3245d2805a18f9dd2cd986d23ebe759f76e382310cfab92a3
font_01_sfnt_off00005eeb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5EEB 19436 bytes
SHA-256: 152779ac3709d5a43144f85cc286cfc78713a2961a87782e1bc06cce99e4fdaa

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