Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4ac6843ac5defbc…

MALICIOUS

PDF

48.1 KB Created: 2021-05-13 02:01:27 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 36c601e9a902a4e29189403fce27ecf7 SHA-1: 9f1a31107755317036df7d61deb1dfc008f7917b SHA-256: a4ac6843ac5defbc682c3c13c1f0ba7fceb0d639a13562069dd0e0ed6ad0e7a7
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links, including one identified as a malicious redirector, leading to a "free generator / game hack" lure. The document body and heuristics indicate a social engineering attempt to trick users into clicking these links. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the lure suggest a phishing or scamming attempt, likely leveraging a known exploit or social engineering tactic to deliver a payload or redirect to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9013

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 https://netcdn.xyz/app/431946152/free-100-robux-game-hack In PDF document text
    • https://library.stikeswnpalu.ac.id/repository/minecraft-java-edition-free-trial_GM479516143.pdfIn PDF document text
    • https://library.stikeswnpalu.ac.id/repository/free-printable-roblox-images_GM431946152.pdfIn PDF document text
    • https://library.stikeswnpalu.ac.id/repository/how-do-you-get-free-pet-food-in-coin-master_GM406889139.pdfIn PDF document text
    • https://library.stikeswnpalu.ac.id/repository/roblox-no-download-hack_GM431946152.pdfIn PDF document text
    • https://library.stikeswnpalu.ac.id/repository/minecraft-pocket-edition-free-download_GM479516143.pdfIn PDF document text
    • https://library.stikeswnpalu.ac.id/repository/robux-today_GM431946152.pdfIn PDF document text
    • https://library.stikeswnpalu.ac.id/repository/how-to-get-free-robux-without-human-verification_GM431946152.pdfIn PDF document text
    • https://library.stikeswnpalu.ac.id/repository/get-robux-for-free-2021_GM431946152.pdfIn PDF document text
    • https://library.stikeswnpalu.ac.id/repository/coin-master-free-spins-link-hack_GM406889139.pdfIn PDF document text
    • https://library.stikeswnpalu.ac.id/repository/minecraft-free-demo_GM479516143.pdfIn PDF document text
    • https://library.stikeswnpalu.ac.id/repository/roblox-robux-codes-2021_GM431946152.pdfIn PDF document text
    • https://library.stikeswnpalu.ac.id/repository/spin-link-coin-master_GM406889139.pdfIn PDF document text
    • https://library.stikeswnpalu.ac.id/repository/www-roblox-com-free-robux_GM431946152.pdfIn PDF document text
    • https://library.stikeswnpalu.ac.id/repository/how-to-get-free-robux-no-human-verification-2021_GM431946152.pdfIn PDF document text
    • https://library.stikeswnpalu.ac.id/repository/gamesofficenet-hack-coin-master_GM406889139.pdfIn PDF document text
    • https://library.stikeswnpalu.ac.id/repository/coin-master-hack-version-download-2021_GM406889139.pdfIn PDF document text
    • https://library.stikeswnpalu.ac.id/repository/haktuts-coin-master_GM406889139.pdfIn PDF document text
    • https://library.stikeswnpalu.ac.id/repository/coin-master-free-gold-cards-link-2021_GM406889139.pdfIn PDF document text
    • https://library.stikeswnpalu.ac.id/repository/roblox-free-play_GM431946152.pdfIn PDF document text
    • https://library.stikeswnpalu.ac.id/repository/coin-master-free-spins-link-blogspot-today_GM406889139.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
font_00_sfnt_off00004dac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4DAC 28744 bytes
SHA-256: c09658e72e1d300c458f618d3f1dc943453b1669dc104da3ed9b920141ec05a1
font_01_sfnt_off00008fd8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8FD8 2840 bytes
SHA-256: 3fb127b764b9d10f5525bc4de5ec8316de704409ccb0cf21cff3ad8a30d11676
font_02_sfnt_off0000998a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x998A 18292 bytes
SHA-256: ade71c57547996cc2793a44f7be3e933a3a5664d4c8f362da863e6c031d51f12

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