Malicious PDF — malware analysis report

Static analysis result for SHA-256 608685fb9ef1e36a…

MALICIOUS

PDF

45.0 KB Created: 2021-06-03 06:16:24 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-31
MD5: 05383cbc6955dee368f8ac3ddb4c208b SHA-1: fcd214bb2218f9b0f397e591682fd866d361bdc1 SHA-256: 608685fb9ef1e36a4a9ed86abe2dc0e9877945c82f3e9f649f43a6571efc9a2a
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to websites offering game hacks and free currency, with a primary link pointing to a known malicious redirector. The document body and embedded links suggest a lure for users seeking in-game advantages, which is a common tactic for distributing malware or conducting phishing. No scripts were extracted, but the extensive link farm and redirector usage indicate a high likelihood of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9865

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.online/app/431946152/how-to-get-free-robux-without-offers-game-hack In PDF document text
    • http://digilib.stimlog.ac.id/repository/coin-master-hack-tool-v1-9-pc_GM406889139.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/free-roebucks-com_GM431946152.pdfIn PDF document text
    • http://digilib.stimlog.ac.id/repository/minecraft-pocket-edition-free-ios_GM479516143.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/cheats-to-get-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/minecraft-skins-download-free_GM479516143.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/how-do-i-get-free-robux-on-roblox_GM431946152.pdfIn PDF document text
    • http://digilib.stimlog.ac.id/repository/earn-free-robux-for-roblox_GM431946152.pdfIn PDF document text
    • http://digilib.stimlog.ac.id/repository/free-coins-on-coin-master_GM406889139.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/free-robux-no-verification-2021-ios_GM431946152.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/coin-master-free-spins-app_GM406889139.pdfIn PDF document text
    • http://digilib.stimlog.ac.id/repository/haktuts-coin-master-free-spin-today_GM406889139.pdfIn PDF document text
    • http://digilib.stimlog.ac.id/repository/coin-master-spin-free_GM406889139.pdfIn PDF document text
    • http://digilib.stimlog.ac.id/repository/roblox-free-vip-server_GM431946152.pdfIn PDF document text
    • http://digilib.stimlog.ac.id/repository/how-to-get-free-spins-on-coin-master-2021_GM406889139.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/minecraft-dungeons-free-download_GM479516143.pdfIn PDF document text
    • http://digilib.stimlog.ac.id/repository/mcpe-master-hack-unlimited-coins-latest-version_GM406889139.pdfIn PDF document text
    • http://digilib.stimlog.ac.id/repository/real-free-robux-generator_GM431946152.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/minecraft-svg-free_GM479516143.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/coin-master-hacks-no-human-verification_GM406889139.pdfIn PDF document text
    • http://digilib.stimlog.ac.id/repository/coin-master-free-spins-link-download-free_GM406889139.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_off000051fb.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x51FB 24916 bytes
SHA-256: f853b8bace7fa624cf639fb9fc87a5352d80c955d8742123944e98e247ebc050
font_01_sfnt_off00008bab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8BAB 18768 bytes
SHA-256: 90722031df8f7e72138583497ea9de630fa8b2a13d2a01041543da505e8107b2

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