Malicious PDF — malware analysis report

Static analysis result for SHA-256 598479f7a001aa5b…

MALICIOUS

PDF

45.3 KB Created: 2021-06-09 16:17:51 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-21
MD5: b41a2decec9c50a8ae1a25704d4916aa SHA-1: 46a545f060fcd1013794c65b2031c96130fced55 SHA-256: 598479f7a001aa5bbf42e54c9c2a65e765f0d6ea0f215dca3a3254f2820443e9
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to known malicious redirectors, specifically advertising free game hacks and currency. The document body, though heavily obfuscated, contains references to these lures and associated URLs. The primary goal appears to be directing users to potentially malicious websites through these deceptive links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9864

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.tw/app/431946152/keyword-free-robux-game-hack In PDF document text
    • https://tena-g.hr/files/free-robux-generator-com-roblox-hack_GM431946152.pdfIn PDF document text
    • https://tena-g.hr/files/daily-free-spins-coin-master-heaven_GM406889139.pdfIn PDF document text
    • https://tena-g.hr/files/how-to-get-free-robux-no-human-verification_GM431946152.pdfIn PDF document text
    • https://www.tena-g.hr/files/free-promo-codes-for-roblox-2021_GM431946152.pdfIn PDF document text
    • https://tena-g.hr/files/hacks-master-coin_GM406889139.pdfIn PDF document text
    • https://www.tena-g.hr/files/coin-master-daily-free-spins-link-facebook_GM406889139.pdfIn PDF document text
    • https://tena-g.hr/files/freerubux_GM431946152.pdfIn PDF document text
    • https://www.tena-g.hr/files/coin-master-free-spins-link-today-new-2021_GM406889139.pdfIn PDF document text
    • https://www.tena-g.hr/files/free-robux-gift-card-codes_GM431946152.pdfIn PDF document text
    • https://tena-g.hr/files/best-free-spin-app-for-coin-master_GM406889139.pdfIn PDF document text
    • https://tena-g.hr/files/free-coin-and-spin-for-coin-master_GM406889139.pdfIn PDF document text
    • https://www.tena-g.hr/files/free-robux-with-no-human-verification_GM431946152.pdfIn PDF document text
    • https://www.tena-g.hr/files/coin-master-free-foxy-food_GM406889139.pdfIn PDF document text
    • https://www.tena-g.hr/files/free-coin-master-spins-links-2021_GM406889139.pdfIn PDF document text
    • https://tena-g.hr/files/how-to-earn-robux_GM431946152.pdfIn PDF document text
    • https://www.tena-g.hr/files/roblox-hack-generator_GM431946152.pdfIn PDF document text
    • https://tena-g.hr/files/free-robux-by-watching-ads_GM431946152.pdfIn PDF document text
    • https://www.tena-g.hr/files/coin-master-invite-friends-free-spins_GM406889139.pdfIn PDF document text
    • https://www.tena-g.hr/files/coin-master-free-spins-and-coins-daily-links_GM406889139.pdfIn PDF document text
    • https://www.tena-g.hr/files/how-to-get-free-gamepasses-on-roblox_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_004_off00004e4f.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4E4F 27440 bytes
SHA-256: dc9018552cfa493be897ac8c1360ea7c7983a6ca8e8ca21a1796f840e3f64b8c
font_01_sfnt_off00008dcf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8DCF 18532 bytes
SHA-256: c6b6016cc59dcb45405b8e5db890beb8270611d22f4427f46e7b4254bf82e606

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