Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b71e1d69e6abdf0…

MALICIOUS

PDF

43.5 KB Created: 2021-06-08 17:46:35 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-24
MD5: a6593e13611f5a61e8d687253b52925d SHA-1: 547a8a8e6c0081b25b00510401315822c1760186 SHA-256: 0b71e1d69e6abdf0c7188f7f4489a5dac9544439da59fe4db17e15d921a84be6
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links that are flagged as malicious redirectors, leading to websites promising game hacks and free currency. The document body and embedded links suggest a lure for users seeking in-game advantages, which is a common tactic for phishing or malware delivery. No scripts were extracted, but the presence of malicious links and the ML classifier's high confidence indicate a high likelihood of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9865

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 https://netcdn.tw/app/431946152/how-to-get-free-robux-no-tix-game-hack In PDF document text
    • http://mbbs.hr/files/coin-master-free-coins-link_GM406889139.pdfIn PDF document text
    • http://mbbs.hr/files/robux-com-free-robux_GM431946152.pdfIn PDF document text
    • https://mbbs.hr/files/facebook-coin-master_GM406889139.pdfIn PDF document text
    • http://mbbs.hr/files/coin-master-hack-pro-gamers_GM406889139.pdfIn PDF document text
    • http://mbbs.hr/files/free-tiktok-coins_GM835599320.pdfIn PDF document text
    • https://mbbs.hr/files/coun-master_GM406889139.pdfIn PDF document text
    • https://mbbs.hr/files/roblox-april-fools-hack_GM431946152.pdfIn PDF document text
    • https://mbbs.hr/files/roblox-skins-boy-free_GM431946152.pdfIn PDF document text
    • https://mbbs.hr/files/coin-master-free-spins-glitch_GM406889139.pdfIn PDF document text
    • http://mbbs.hr/files/robux-generator-without-verification_GM431946152.pdfIn PDF document text
    • https://mbbs.hr/files/free-robux-2021_GM431946152.pdfIn PDF document text
    • https://mbbs.hr/files/how-to-hack-robux_GM431946152.pdfIn PDF document text
    • https://mbbs.hr/files/pubg-uc-esp-hack_GM1330123889.pdfIn PDF document text
    • https://mbbs.hr/files/how-to-get-free-airpods-tiktok_GM835599320.pdfIn PDF document text
    • https://mbbs.hr/files/how-to-get-free-robux-on-phone_GM431946152.pdfIn PDF document text
    • https://mbbs.hr/files/bux-gg-robux-free_GM431946152.pdfIn PDF document text
    • http://mbbs.hr/files/actual-free-robux_GM431946152.pdfIn PDF document text
    • https://mbbs.hr/files/25-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • https://mbbs.hr/files/minecraft-hacked-client_GM479516143.pdfIn PDF document text
    • https://mbbs.hr/files/free-spins-coin-master-november-2021_GM406889139.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
stream_004_off00004ba6.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4BA6 26136 bytes
SHA-256: 8d3d69862a39da7ae6d618b7a5f2ec6a2f23deaae2b2c4bb39ebe0ff1383a54f
font_01_sfnt_off0000870b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x870B 18404 bytes
SHA-256: 2adbdb4b22947009d058beef38b91c964f92861d74731f8b082ac48fa0db7707

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