Malicious PDF — malware analysis report

Static analysis result for SHA-256 b95ac24747f87646…

MALICIOUS

PDF

49.4 KB Created: 2021-06-09 04:38:15 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-23
MD5: d723244947e8785702db9ea8f7675daf SHA-1: d24e74fa7dce67e61ba58abdc57e1e708a0db797 SHA-256: b95ac24747f876467680d5db5ff06725a39be62f47b937439ed2f8e017d453de
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document contains multiple links to known malicious redirectors and a large number of links to other PDFs, likely part of an SEO spam campaign. The primary lure is related to game hacks and generators, aiming to trick users into visiting these malicious sites. While no scripts were explicitly extracted, the PDF structure and embedded URLs strongly suggest a phishing or redirection attack, likely initiated via a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9796

Heuristics 5

  • 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.
  • 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/free-roblox-script-corrector-discord-game-hack In PDF document text
    • http://lib.uho.ac.id/library//repository/free-spins-for-coin-masters_GM406889139.pdfIn PDF document text
    • http://lib.uho.ac.id/library//repository/hacks-for-roblox-jailbreak_GM431946152.pdfIn PDF document text
    • http://lib.uho.ac.id/library//repository/coin-master-free-spins-and-coins-daily_GM406889139.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/free-minecraft-windows-10-account_GM479516143.pdfIn PDF document text
    • http://lib.uho.ac.id/library//repository/how-to-hack-coin-master-cheat-engine_GM406889139.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/coin-master-free-spins-ios_GM406889139.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/minecraft-pe-free-download-android_GM479516143.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/coin-master-free-spins-hack-iphone_GM406889139.pdfIn PDF document text
    • http://lib.uho.ac.id/library//repository/free-coin-master-hacks_GM406889139.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/get-free-spins-on-coin-master-links_GM406889139.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/free-roblox-accounts-2021-with-robux_GM431946152.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/free-spins-coin-master-links-2021_GM406889139.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/minecraft-free-download-2021_GM479516143.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/free-roblox-premium_GM431946152.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/free-modded-minecraft-server-hosting_GM479516143.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/minecraft-online-free-download_GM479516143.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/roblox-rewards-site_GM431946152.pdfIn PDF document text
    • http://lib.uho.ac.id/library//repository/free-coin-master-spins-and-coins-for-daily_GM406889139.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/free-minecraft-server-hosting_GM479516143.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/free-robux-roblox-promo-codes_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off000050db.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x50DB 28772 bytes
SHA-256: c1f974e138f09eefd876bec2c468fe7c2e68b97289e9427382ada984b5dc5e11
font_01_sfnt_off000090a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x90A6 3884 bytes
SHA-256: 40b61f8938bd710dc29dc58ba3fde91c245a6a69596ec569b4d27c769ca417cf
font_02_sfnt_off00009d4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9D4E 18692 bytes
SHA-256: 5b6ccb2f3c8584f88470a0f53693628e8e45cf929689d29a75c428793393136f

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