Malicious PDF — malware analysis report

Static analysis result for SHA-256 88873912b48f8ea4…

MALICIOUS

PDF

35.6 KB Created: 2021-07-03 19:18:28 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-02
MD5: ca43af207ca1d54bb0603525f8e4da28 SHA-1: af5a5b49aaa89f1a246373af12227a98a1159897 SHA-256: 88873912b48f8ea432d1ad0aaef264e8d5cf85fc89d9a2ac25df4decff002e9e
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a critical heuristic firing for a game hack redirect lure, pointing to known malicious infrastructure. The document body, though partially garbled, includes the same URL, reinforcing the malicious intent. The ML classifier also strongly flagged this PDF as malicious. No scripts were extracted, but the primary attack vector appears to be a deceptive link leading to a malicious redirector.

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/479516143/how-to-create-a-minecraft-server-for-free-game-hack In PDF document text
    • https://www.titastar.com/uploaded_files/userfiles/files/how-to-hack-into-roblox-for-robux_GM431946152.pdfIn PDF document text
    • https://www.titastar.com/uploaded_files/userfiles/files/how-to-get-roblox-premium-for-free-2021_GM431946152.pdfIn PDF document text
    • https://www.titastar.com/uploaded_files/userfiles/files/coin-master-fan-page-free-spins_GM406889139.pdfIn PDF document text
    • https://www.titastar.com/uploaded_files/userfiles/files/notoriety-roblox-hack-script_GM431946152.pdfIn PDF document text
    • https://www.titastar.com/uploaded_files/userfiles/files/how-to-hack-someones-minecraft-account_GM479516143.pdfIn PDF document text
    • https://www.titastar.com/uploaded_files/userfiles/files/free-free-robux_GM431946152.pdfIn PDF document text
    • https://www.titastar.com/uploaded_files/userfiles/files/roblox-games-free-roblox-games_GM431946152.pdfIn PDF document text
    • https://www.titastar.com/uploaded_files/userfiles/files/how-to-get-free-robux-inspect_GM431946152.pdfIn PDF document text
    • https://www.titastar.com/uploaded_files/userfiles/files/free-robux-generator-2021-no-human-verification-or-survey_GM431946152.pdfIn PDF document text
    • https://www.titastar.com/uploaded_files/userfiles/files/roblox-online-free_GM431946152.pdfIn PDF document text
    • https://www.titastar.com/uploaded_files/userfiles/files/can-i-get-robux-for-free_GM431946152.pdfIn PDF document text
    • https://www.titastar.com/uploaded_files/userfiles/files/minecraft-bedrock-edition-free-with-java_GM479516143.pdfIn PDF document text
    • https://www.titastar.com/uploaded_files/userfiles/files/master-coin-free_GM406889139.pdfIn PDF document text
    • https://www.titastar.com/uploaded_files/userfiles/files/roblox-free-robux-generator_GM431946152.pdfIn PDF document text
    • https://www.titastar.com/uploaded_files/userfiles/files/coin-master-hack-apk-with-fb-login-2021_GM406889139.pdfIn PDF document text
    • https://www.titastar.com/uploaded_files/userfiles/files/free-roblox-accounts_GM431946152.pdfIn PDF document text
    • https://www.titastar.com/uploaded_files/userfiles/files/auto-hacker-roblox_GM431946152.pdfIn PDF document text
    • https://www.titastar.com/uploaded_files/userfiles/files/hacks-minecraft_GM479516143.pdfIn PDF document text
    • https://www.titastar.com/uploaded_files/userfiles/files/hack-roblox-hydra_GM431946152.pdfIn PDF document text
    • https://www.titastar.com/uploaded_files/userfiles/files/tik-tok-free-fire-kreatif-lucu_GM835599320.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_off00003643.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3643 22780 bytes
SHA-256: 630a05bde55c072d2f66452fb19513d634624d50964e9ebcf13887edc7f7792b
font_01_sfnt_off000068b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x68B7 18276 bytes
SHA-256: 6ccfea5760c71d6df4ee421b3d45b23bb51577d79c71acde93037ba3fd9ba488

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