Malicious PDF — malware analysis report

Static analysis result for SHA-256 d677658cdc114dd1…

MALICIOUS

PDF

35.5 KB Created: 2021-07-05 19:25:08 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 26f5412e1465b444498ef02f326fb487 SHA-1: 0ee4409ab923693e230873571f274a59e687e1a3 SHA-256: d677658cdc114dd14ac508c84cb2a84e3925579fcbb453410baa1d8ca30f5ab1
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains links that redirect to known malicious infrastructure, specifically promoting game hacks and cheats. The document body and embedded URLs suggest a lure for users seeking in-game advantages, which is a common social engineering tactic. The ML classifier also strongly indicated maliciousness, supporting the conclusion that this PDF is part of a phishing or malware distribution chain.

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/coin-master-game-hunter-game-hack In PDF document text
    • http://muslib.unmus.ac.id//repository/coin-master-free-spins-facebook_GM406889139.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/roblox-hack-unlimited-robux_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id//repository/sites-for-free-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://muslib.unmus.ac.id//repository/how-to-hack-roblox-accounts_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/village-coin_GM406889139.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/how-to-noclip-and-speed-hack-in-roblox-jailbreak_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/free-nike-shirt-roblox_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/roblox-ccv3-speed-hack_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/free-spins-coin-master-daily_GM406889139.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/roblox-catalog-heaven-hack_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/easy-no-servay-free-robux_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/roblox-adopt-me-bucks-hack_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/quick-robux-hacks_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/free-robux-1-minute_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/rbxoffers-earn-free-robux_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id//repository/coin-master-coin-hack_GM406889139.pdfIn PDF document text
    • http://muslib.unmus.ac.id//repository/coin-master-hack-game_GM406889139.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/coin-master-hack-version-2021_GM406889139.pdfIn PDF document text
    • http://muslib.unmus.ac.id//repository/how-to-get-free-robux-for-kids_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/the-app-that-gives-you-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
font_00_sfnt_off0000330a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x330A 23616 bytes
SHA-256: 48bd2c8cb25fccb9812da444e88e903ea44e311bb69f9245762a91bd7d5c52ba
font_01_sfnt_off00006876.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6876 18236 bytes
SHA-256: 69374843969632816c32d595aee07f3b847b68851897dbbfc86f0e1a6f04d2a5

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