Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f3b40c5907ccc35…

MALICIOUS

PDF

47.5 KB Created: 2021-06-04 03:40:17 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 7ebb1c509d332f6ab514ac1daf407a35 SHA-1: d734918e49361e0bd32566c3941288ed52eab3d4 SHA-256: 3f3b40c5907ccc351b0b117bc67521cf84d1c45b372e61dc89a5e7a089dab002
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a critical heuristic firing for a malicious redirector link, specifically pointing to a 'game hack' lure. The document body and extracted URLs reinforce this, indicating a social engineering attempt to trick users into downloading potentially malicious content. While no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to redirect users to malicious infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9769

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.online/app/479516143/minecraft-bedrock-download-game-hack In PDF document text
    • http://library.fikes.upnvj.ac.id/repository/roblox-free-robux-no-human-verification_GM431946152.pdfIn PDF document text
    • http://library.fikes.upnvj.ac.id/repository/free-robux-no-human-verification-2021_GM431946152.pdfIn PDF document text
    • http://library.fikes.upnvj.ac.id/repository/roblox-bloxburg-free-money_GM431946152.pdfIn PDF document text
    • http://library.fikes.upnvj.ac.id/repository/how-to-get-free-clothes-on-roblox-2021_GM431946152.pdfIn PDF document text
    • http://library.fikes.upnvj.ac.id/repository/coin-master-daily-free-spins-link-today-2021_GM406889139.pdfIn PDF document text
    • http://library.fikes.upnvj.ac.id/repository/how-to-hack-coin-master-spin_GM406889139.pdfIn PDF document text
    • http://library.fikes.upnvj.ac.id/repository/is-minecraft-dungeons-free_GM479516143.pdfIn PDF document text
    • http://library.fikes.upnvj.ac.id/repository/microsoft-bing-free-robux_GM431946152.pdfIn PDF document text
    • http://library.fikes.upnvj.ac.id/repository/robux-match_GM431946152.pdfIn PDF document text
    • http://library.fikes.upnvj.ac.id/repository/free-robux-thumbnail_GM431946152.pdfIn PDF document text
    • http://library.fikes.upnvj.ac.id/repository/coin-master-32-android-mod-hack-apk-download_GM406889139.pdfIn PDF document text
    • http://library.fikes.upnvj.ac.id/repository/google-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • http://library.fikes.upnvj.ac.id/repository/minecraft-bedrock-server-hosting-free_GM479516143.pdfIn PDF document text
    • http://library.fikes.upnvj.ac.id/repository/coin-master-hack-tool-generator_GM406889139.pdfIn PDF document text
    • http://library.fikes.upnvj.ac.id/repository/free-roblox-followers-generator_GM431946152.pdfIn PDF document text
    • http://library.fikes.upnvj.ac.id/repository/free-mods-for-minecraft-pe_GM479516143.pdfIn PDF document text
    • http://library.fikes.upnvj.ac.id/repository/coin-master-2021-free-spins-link-today_GM406889139.pdfIn PDF document text
    • http://library.fikes.upnvj.ac.id/repository/coin-master-spins-hack-2021_GM406889139.pdfIn PDF document text
    • http://library.fikes.upnvj.ac.id/repository/coin-master-home_GM406889139.pdfIn PDF document text
    • http://library.fikes.upnvj.ac.id/repository/free-pet-treats-coin-master_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
stream_004_off000054a8.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x54A8 24484 bytes
SHA-256: 474fb3df70e9c413979ed2b9bdc4e86ccb8b3ef0ae24c7e08045187ed79676ed
font_01_sfnt_off00008c2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8C2A 2840 bytes
SHA-256: 30dce2b9c1950da345d7fed8f00c38887adfa2f2ddecc31775af2315e819ac37
font_02_sfnt_off000095dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x95DD 18676 bytes
SHA-256: 71d03cd911f296367a63c790b96900f67ec797f491b3f6a6ddf408856ea79078

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