Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8234cb93d6906c9…

MALICIOUS

PDF

33.3 KB Created: 2021-07-05 21:21:08 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 571361e1f892eef46e54bc1a5489e039 SHA-1: 32374ce3019eecae63811c65de83c2649eae3fbc SHA-256: d8234cb93d6906c9ea296fe8270da77453af1a9599e0ad3f0b3c6d32241935af
160 Risk Score

Malware Insights

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

The PDF document contains multiple links, including one identified as a malicious redirector, that lure users with promises of game hacks and free currency. The primary link, http://netcdn.tw/app/406889139/free-mods-for-coin-master-game-hack, is associated with known malicious infrastructure. The document body and heuristics confirm the intent to redirect users to potentially harmful content, likely as a phishing or scam attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 http://netcdn.tw/app/406889139/free-mods-for-coin-master-game-hack In PDF document text
    • https://digilib.stimlog.ac.id/repository/minecraft-apk-download-free-11-055_GM479516143.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/free-spin-coin-master-game_GM406889139.pdfIn PDF document text
    • http://digilib.stimlog.ac.id/repository/rbxf-free-robux_GM431946152.pdfIn PDF document text
    • http://digilib.stimlog.ac.id/repository/how-to-get-free-pokeballs-in-pokemon-go-2021_GM1094591345.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/free-gfx-roblox_GM431946152.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/how-to-get-free-robux-onroblox-and-pastebin_GM431946152.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/raviz-cheating-roblox_GM431946152.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/how-to-get-free-shirts-roblox-bc_GM431946152.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/free-roblox-game-scripts_GM431946152.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/minecraft-pocket-edition-free_GM479516143.pdfIn PDF document text
    • http://digilib.stimlog.ac.id/repository/coin-master-free-coins-amp_GM406889139.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/roblox-how-to-create-a-group-for-free_GM431946152.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/roblox-hacked-version-download_GM431946152.pdfIn PDF document text
    • http://digilib.stimlog.ac.id/repository/plug-toolbox-for-minecraft-free-ios_GM479516143.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/the-only-free-robux-game-that-works-1_GM431946152.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/minecraft-education-edition-free_GM479516143.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/get-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/free-robux-august-16-v20-7_GM431946152.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/free-robux-rewards_GM431946152.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/hax-teamcf-free-robux_GM431946152.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_002_off00002da5.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x2DA5 22368 bytes
SHA-256: 0579bd5b5e4c836602a876ab41059557b92ed7fbdfa6f69891e1b9248af70a68
font_01_sfnt_off00005f8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5F8D 18172 bytes
SHA-256: 65b8c7323ee5b79fc15d205096ebdf4a77b3870f68de55403bfd7c845cb9ec2a

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