Malicious PDF — malware analysis report

Static analysis result for SHA-256 b44b2793cff12573…

MALICIOUS

PDF

34.5 KB Created: 2021-07-03 20:36:26 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 4f836547a920c6ec4c0c9f292c813cb7 SHA-1: 58d9c69d355df6bfac69eb21d5fb7f1bf2dfcfe4 SHA-256: b44b2793cff12573defce13af66ebf5f353bd05c2132d8415e3745e5da95b6bb
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links that are flagged as malicious redirectors, specifically targeting users with lures for free in-game items like 'Robux' and 'Coin Master' spins. The document body and extracted URLs strongly suggest a phishing or scam attempt designed to drive traffic to potentially harmful websites. No scripts were extracted, but the presence of malicious links and the 'game hack' lure indicate a high likelihood of user redirection to exploit or scam pages.

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-survey-game-hack In PDF document text
    • http://itc-nekretnine.hr/files/free-admin-on-roblox-free-robux-2021_GM431946152.pdfIn PDF document text
    • http://itc-nekretnine.hr/files/how-to-get-free-robux-without-verifying_GM431946152.pdfIn PDF document text
    • https://www.itc-nekretnine.hr/files/free-roblox-hack_GM431946152.pdfIn PDF document text
    • https://www.itc-nekretnine.hr/files/rare-free-links-to-coin-master_GM406889139.pdfIn PDF document text
    • http://itc-nekretnine.hr/files/roblox-invisible-pants-free_GM431946152.pdfIn PDF document text
    • http://itc-nekretnine.hr/files/tiktok-famous-club-free-followers_GM835599320.pdfIn PDF document text
    • https://www.itc-nekretnine.hr/files/free-roblox-game-codes_GM431946152.pdfIn PDF document text
    • https://www.itc-nekretnine.hr/files/extra-free-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • https://www.itc-nekretnine.hr/files/minecraft-pocket-edition-free-apk_GM479516143.pdfIn PDF document text
    • http://itc-nekretnine.hr/files/minecraft-free-unblocked_GM479516143.pdfIn PDF document text
    • https://www.itc-nekretnine.hr/files/how-to-get-free-tiktok-likes_GM835599320.pdfIn PDF document text
    • https://www.itc-nekretnine.hr/files/vehicle-simulator-roblox-hack_GM431946152.pdfIn PDF document text
    • http://itc-nekretnine.hr/files/roblox-exploit-scripts_GM431946152.pdfIn PDF document text
    • http://itc-nekretnine.hr/files/free-spins-and-coins-coin-master_GM406889139.pdfIn PDF document text
    • http://itc-nekretnine.hr/files/cheats-coin-master-free_GM406889139.pdfIn PDF document text
    • https://www.itc-nekretnine.hr/files/coin-master-redeem-code-free_GM406889139.pdfIn PDF document text
    • http://itc-nekretnine.hr/files/how-to-hack-coin-master-spin-ios_GM406889139.pdfIn PDF document text
    • http://itc-nekretnine.hr/files/how-to-hack-robux-into-your-user_GM431946152.pdfIn PDF document text
    • http://itc-nekretnine.hr/files/hacks-para-roblox_GM431946152.pdfIn PDF document text
    • http://itc-nekretnine.hr/files/free-roblox-accounts-with-life-time-obc_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_off00002f2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2F2C 22208 bytes
SHA-256: 5f83f753c1ad54c9548208d702f0527929fb290c60f247f8428aa29b36bd8797
font_01_sfnt_off00006051.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6051 19600 bytes
SHA-256: ca7a388806d592ab2d8315d83d492e3246b9fd008add48962cfd3e7e10a7156d

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