Malicious PDF — malware analysis report

Static analysis result for SHA-256 e0f0a29aeba90ce0…

MALICIOUS

PDF

44.0 KB Created: 2021-06-07 03:48:35 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 0b50eebd7bddf1a594237ea77203faff SHA-1: 99a5be6487accb102e9a1a3c97a4a0df4e4eb350 SHA-256: e0f0a29aeba90ce0ec6e886e42335155be07893c92709657cff411d74352ffb3
260 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document employs a fake CAPTCHA lure to trick users into interacting with malicious links. The document contains numerous links to external sites, including a known malicious redirector, which are likely intended to lead users to scam pages or download further malware. The presence of multiple links and the fake CAPTCHA strongly suggest a phishing or scamming attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9865

Heuristics 6

  • 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.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Fake CAPTCHA / human verification prompt high SE_FAKE_CAPTCHA
    Document displays a fake CAPTCHA or human-verification prompt — used to trick users into running commands or pressing keyboard shortcuts
  • 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/roblox-how-to-get-free-limiteds-game-hack In PDF document text
    • https://perpustakaan.stami.ac.id//repository/microsoft-rewards-robux_GM431946152.pdfIn PDF document text
    • https://perpustakaan.stami.ac.id/repository/promo-codes-for-free-robux_GM431946152.pdfIn PDF document text
    • https://perpustakaan.stami.ac.id/repository/free-spin-link-for-coin-master_GM406889139.pdfIn PDF document text
    • https://perpustakaan.stami.ac.id//repository/how-do-you-hack-roblox_GM431946152.pdfIn PDF document text
    • https://perpustakaan.stami.ac.id/repository/roblox-mobile-hack_GM431946152.pdfIn PDF document text
    • https://perpustakaan.stami.ac.id//repository/free-robux-that-actually-works-2021_GM431946152.pdfIn PDF document text
    • https://perpustakaan.stami.ac.id//repository/coin-master-hack-android-no-root_GM406889139.pdfIn PDF document text
    • https://perpustakaan.stami.ac.id/repository/claimrobux-net_GM431946152.pdfIn PDF document text
    • https://perpustakaan.stami.ac.id//repository/free-roebucks-no-human-verification_GM431946152.pdfIn PDF document text
    • https://perpustakaan.stami.ac.id/repository/roblox-cheats-for-robux-for-phone_GM431946152.pdfIn PDF document text
    • https://perpustakaan.stami.ac.id/repository/rbxoffer-com-free-robux_GM431946152.pdfIn PDF document text
    • https://perpustakaan.stami.ac.id/repository/www-coin-master_GM406889139.pdfIn PDF document text
    • https://perpustakaan.stami.ac.id/repository/roblox-online-free-no-download_GM431946152.pdfIn PDF document text
    • https://perpustakaan.stami.ac.id//repository/coin-master-free-spins-app_GM406889139.pdfIn PDF document text
    • https://perpustakaan.stami.ac.id/repository/coin-master-hack-apk-download-2021_GM406889139.pdfIn PDF document text
    • https://perpustakaan.stami.ac.id//repository/how-to-get-free-robux-without-verification-2021_GM431946152.pdfIn PDF document text
    • https://perpustakaan.stami.ac.id//repository/online-coin-master-free-spin-app_GM406889139.pdfIn PDF document text
    • https://perpustakaan.stami.ac.id/repository/irobux-com-redeem_GM431946152.pdfIn PDF document text
    • https://perpustakaan.stami.ac.id//repository/free-robux-without-verification-or-survey_GM431946152.pdfIn PDF document text
    • https://perpustakaan.stami.ac.id//repository/how-to-get-minecoins-in-minecraft-for-free_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_004_off00004f8b.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4F8B 25172 bytes
SHA-256: 724a0439b0dc1f464e36ebc94d71c305374dffe8bb7fc20c3ad0e008f8b99565
font_01_sfnt_off000087f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x87F8 18772 bytes
SHA-256: 0bc6b4a6136937294c3afce34e3ec0397a89171267463c10e73aa5c015b53ad3

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