Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1ba80228cb63aa7…

MALICIOUS

PDF

34.7 KB Created: 2021-07-05 13:35:52 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-12
MD5: c2ff2c84b7e766f17a2eac86b8e81923 SHA-1: 2b6b6f4316eb724b4386b78e467e27f08213fd10 SHA-256: b1ba80228cb63aa758b21cafe581e9ee647f74e84f094623def8743ac5e99176
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links, including one identified as a malicious redirector, that lure users with promises of game hacks and free in-game currency. The primary malicious URL, http://netcdn.tw/app/431946152/admin-commands-script-roblox-hack-game-hack, is likely used to deliver a secondary payload or lead users to a phishing site. The ML classifier also strongly indicated maliciousness.

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/admin-commands-script-roblox-hack-game-hack In PDF document text
    • https://digilib.stimlog.ac.id/repository/roblox-free-robux-no-human-verification_GM431946152.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/coin-master-fan-club_GM406889139.pdfIn PDF document text
    • http://digilib.stimlog.ac.id/repository/how-to-get-free-robux-without-download-apps-or-survey_GM431946152.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/roblox-cheat-xbox-one_GM431946152.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/mining-simulator-roblox-hack_GM431946152.pdfIn PDF document text
    • http://digilib.stimlog.ac.id/repository/free-robux-on-phone_GM431946152.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/minecraft-free-download-mac_GM479516143.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/hacks-forbee-swarm-simulator-roblox_GM431946152.pdfIn PDF document text
    • http://digilib.stimlog.ac.id/repository/free-robux-instantly_GM431946152.pdfIn PDF document text
    • http://digilib.stimlog.ac.id/repository/apps-to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/roblox-troll-hacks_GM431946152.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/roblox-phantom-forces-free-hack_GM431946152.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/free-minecraft-capes-no-mods_GM479516143.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/free-clothes-with-roblox_GM431946152.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/how-to-play-roblox-on-itunes-for-free_GM431946152.pdfIn PDF document text
    • http://digilib.stimlog.ac.id/repository/roblox-free-robux-hack_GM431946152.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/promo-code-free-robux_GM431946152.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/roblox-hack-robux-generator-2021_GM431946152.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/coin-master-free-spins-2-5-2021_GM406889139.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/how-you-get-free-robux-on-roblox_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_off00002f3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2F3B 22312 bytes
SHA-256: 0cf61db2f8ae1096660f8ed835248bd267033b6324775af679bde9bca62b4ad1
font_01_sfnt_off0000612f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x612F 19488 bytes
SHA-256: 5fa82e3c40503d626dae3251e12d0367246074e807d4c9e96da6058b2b8b1847

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