Malicious PDF — malware analysis report

Static analysis result for SHA-256 40bab2a599be71b0…

MALICIOUS

PDF

35.1 KB Created: 2021-07-04 10:08:25 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 82d116ddc151e85b8d8e9951a04468e9 SHA-1: afa7eda7561ed322f19cb8a28caad1c73b86b4fd SHA-256: 40bab2a599be71b05eff74b11abafd5ec43904e833775dae9fe5bb4ebeceeb44
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links that redirect to malicious infrastructure, specifically promoting 'free generator / game hack' lures. The primary malicious URL identified is http://netcdn.tw/app/406889139/free-spins-for-coin-master-2021-game-hack. This indicates a social engineering attack aimed at tricking users into visiting potentially harmful websites, likely for credential harvesting or further malware delivery.

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-spins-for-coin-master-2021-game-hack In PDF document text
    • http://olimpik.mk/imagescke/upload/files/redeem-roblox-virtual-item-free-codes-2021_GM431946152.pdfIn PDF document text
    • http://olimpik.mk/imagescke/upload/files/coin-master-link_GM406889139.pdfIn PDF document text
    • http://olimpik.mk/imagescke/upload/files/roblox-polygun-hacks_GM431946152.pdfIn PDF document text
    • http://olimpik.mk/imagescke/upload/files/tower-of-hell-roblox-hack_GM431946152.pdfIn PDF document text
    • http://olimpik.mk/imagescke/upload/files/how-to-get-any-item-in-roblox-without-hacking-2021_GM431946152.pdfIn PDF document text
    • http://olimpik.mk/imagescke/upload/files/all-free-items-in-roblox_GM431946152.pdfIn PDF document text
    • http://olimpik.mk/imagescke/upload/files/how-to-get-hacks-on-minecraft_GM479516143.pdfIn PDF document text
    • http://olimpik.mk/imagescke/upload/files/roblox-bubble-gum-unlimited-candy-hack_GM431946152.pdfIn PDF document text
    • http://olimpik.mk/imagescke/upload/files/coin-master-heaven-free-spins_GM406889139.pdfIn PDF document text
    • http://olimpik.mk/imagescke/upload/files/how-to-get-free-robux-easy-2021_GM431946152.pdfIn PDF document text
    • http://olimpik.mk/imagescke/upload/files/roblox-free-clothes-hack-2021_GM431946152.pdfIn PDF document text
    • http://olimpik.mk/imagescke/upload/files/free-tiktok-followers-without-human-verification_GM835599320.pdfIn PDF document text
    • http://olimpik.mk/imagescke/upload/files/free-modded-roblox-games_GM431946152.pdfIn PDF document text
    • http://olimpik.mk/imagescke/upload/files/get-free-coins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://olimpik.mk/imagescke/upload/files/roblox-tycoon-pc-cheats_GM431946152.pdfIn PDF document text
    • http://olimpik.mk/imagescke/upload/files/coin-master-free-spins-a2z-help_GM406889139.pdfIn PDF document text
    • http://olimpik.mk/imagescke/upload/files/hack-para-robux-generator_GM431946152.pdfIn PDF document text
    • http://olimpik.mk/imagescke/upload/files/roblox-unlimited-robux-hack-no-human-verification_GM431946152.pdfIn PDF document text
    • http://olimpik.mk/imagescke/upload/files/coin-master-daily-free-spins-link-today_GM406889139.pdfIn PDF document text
    • http://olimpik.mk/imagescke/upload/files/www-rubux_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_off0000317b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x317B 23152 bytes
SHA-256: 9fd6777a5f16e56a4efaf20c008a6ed2eae79fd63d7c3d4b43bbba9e1ba5bbaa
font_01_sfnt_off0000658d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x658D 18576 bytes
SHA-256: fb0fb59ed2c1a9034e606a4b9af272ef40c933264071e94cfd5fd7ab3c408864

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