Malicious PDF — malware analysis report

Static analysis result for SHA-256 73f26b8e0fa0b317…

MALICIOUS

PDF

36.2 KB Created: 2021-07-09 19:34:02 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-02
MD5: 1421bf2238bd9b80db72dad862de4c7d SHA-1: 5d0762fd106da6c033f6285c84cbf7f1d475eca8 SHA-256: 73f26b8e0fa0b317900cd9f649b4833c09bdd61e7362c9abf86b5efd4aa72507
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document employs a lure of free Robux and game hacks to trick users into clicking malicious links. The primary link directs to a known malicious redirector infrastructure, likely serving as a gateway to further malicious content or exploits. The ML classifier strongly indicated maliciousness, and the PDF structure itself contains multiple links to potentially harmful content.

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/robuxlove-net-free-robux-game-hack In PDF document text
    • https://www.titastar.com/uploaded_files/userfiles/files/free-appsfor-coin-master-daily-rewards_GM406889139.pdfIn PDF document text
    • https://www.titastar.com/uploaded_files/userfiles/files/free-minecraft-printables_GM479516143.pdfIn PDF document text
    • https://www.titastar.com/uploaded_files/userfiles/files/roblox-birthday-invitations-free-printable_GM431946152.pdfIn PDF document text
    • https://www.titastar.com/uploaded_files/userfiles/files/get-robux_GM431946152.pdfIn PDF document text
    • https://www.titastar.com/uploaded_files/userfiles/files/coin-master-daily-free-spins-link-today-haktuts_GM406889139.pdfIn PDF document text
    • https://www.titastar.com/uploaded_files/userfiles/files/mcpe-master-hack-unlimited-coins-latest-version_GM406889139.pdfIn PDF document text
    • https://www.titastar.com/uploaded_files/userfiles/files/coin-master-mod-apk-2021_GM406889139.pdfIn PDF document text
    • https://www.titastar.com/uploaded_files/userfiles/files/coin-and-spin-link_GM406889139.pdfIn PDF document text
    • https://www.titastar.com/uploaded_files/userfiles/files/roblox-hacks-that-actually-work_GM431946152.pdfIn PDF document text
    • https://www.titastar.com/uploaded_files/userfiles/files/202100-robux-hack_GM431946152.pdfIn PDF document text
    • https://www.titastar.com/uploaded_files/userfiles/files/coin-master-daily-free-spins-today_GM406889139.pdfIn PDF document text
    • https://www.titastar.com/uploaded_files/userfiles/files/free-robux-if-you-join-my-group_GM431946152.pdfIn PDF document text
    • https://www.titastar.com/uploaded_files/userfiles/files/how-to-hack-roblox-treasure-hunt-simulator-get-rebirth_GM431946152.pdfIn PDF document text
    • https://www.titastar.com/uploaded_files/userfiles/files/roblox-robux-hack-no-survey-no-download-2021_GM431946152.pdfIn PDF document text
    • https://www.titastar.com/uploaded_files/userfiles/files/free-robux-advertisement_GM431946152.pdfIn PDF document text
    • https://www.titastar.com/uploaded_files/userfiles/files/gold-cards-coin-master-hack_GM406889139.pdfIn PDF document text
    • https://www.titastar.com/uploaded_files/userfiles/files/free-robux-codes-2021_GM431946152.pdfIn PDF document text
    • https://www.titastar.com/uploaded_files/userfiles/files/how-to-get-free-robux-not-a-scam_GM431946152.pdfIn PDF document text
    • https://www.titastar.com/uploaded_files/userfiles/files/gengreating-free-roblox-redeeem-codes_GM431946152.pdfIn PDF document text
    • https://www.titastar.com/uploaded_files/userfiles/files/free-minecraft-servers-to-join_GM479516143.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_002_off00003521.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x3521 23096 bytes
SHA-256: 12f4e97c98a728def0d7e9dcbff2221e8b2d0f382a1922cf3978899b4c92670d
font_01_sfnt_off000068c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x68C2 19008 bytes
SHA-256: 92c71e3ee54162ecdb90edce310839d96772666fc8f893851f22cdce92d826b2

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