Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6f4006496c72722…

MALICIOUS

PDF

33.1 KB Created: 2021-07-04 01:02:26 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-24
MD5: b12bb2ef46a83067da6db1a1f54eaf4e SHA-1: 30e9245072038a5c5833d29e55c3ecf91c9a0fa2 SHA-256: b6f4006496c72722cb7f65c35fdf4e3322f75ae781d9cc1ef12c743dc95f87a4
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links, including one pointing to a known malicious redirector infrastructure at http://netcdn.tw/app/479516143/minecraft-tower-defense-hacked-game-hack. This lure is presented as a 'free generator / game hack', aiming to trick users into clicking. The ML classifier also strongly indicated maliciousness. No scripts were extracted, but the primary attack vector appears to be social engineering via deceptive links within the document.

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/479516143/minecraft-tower-defense-hacked-game-hack In PDF document text
    • https://www.sonestad.se/library/repository/all-minecraft-handbooks_GM479516143.pdfIn PDF document text
    • https://www.sonestad.se/library/repository/free-roblox-clothes-templates_GM431946152.pdfIn PDF document text
    • https://www.sonestad.se/library/repository/coin-master-daily-free-spin-and-coin-link-haktuts_GM406889139.pdfIn PDF document text
    • https://www.sonestad.se/library/repository/coin-master-hack-2021-download_GM406889139.pdfIn PDF document text
    • https://www.sonestad.se/library/repository/coin-master-hack-online-without-human-verification_GM406889139.pdfIn PDF document text
    • https://www.sonestad.se/library/repository/how-to-get-free-robux-without-surveys_GM431946152.pdfIn PDF document text
    • https://www.sonestad.se/library/repository/free-online-spins-coin-master_GM406889139.pdfIn PDF document text
    • https://www.sonestad.se/library/repository/scary-larry-roblox_GM431946152.pdfIn PDF document text
    • https://www.sonestad.se/library/repository/roblox-bux-free_GM431946152.pdfIn PDF document text
    • https://www.sonestad.se/library/repository/how-to-get-free-robux-as-a-kid_GM431946152.pdfIn PDF document text
    • https://www.sonestad.se/library/repository/how-to-get-free-robux-on-roblox-ios_GM431946152.pdfIn PDF document text
    • https://www.sonestad.se/library/repository/roblox-hack-2021_GM431946152.pdfIn PDF document text
    • https://www.sonestad.se/library/repository/coin-master-free-spin-and-coins-links-2021_GM406889139.pdfIn PDF document text
    • https://www.sonestad.se/library/repository/how-to-noclip-with-gun-roblox-jailbreak-no-hack_GM431946152.pdfIn PDF document text
    • https://www.sonestad.se/library/repository/are-pubg-uc-free_GM1330123889.pdfIn PDF document text
    • https://www.sonestad.se/library/repository/install-free-game-coin-master_GM406889139.pdfIn PDF document text
    • https://www.sonestad.se/library/repository/arsenal-hacks-roblox_GM431946152.pdfIn PDF document text
    • https://www.sonestad.se/library/repository/coin-master-hack-ios_GM406889139.pdfIn PDF document text
    • https://www.sonestad.se/library/repository/coin-free-master_GM406889139.pdfIn PDF document text
    • https://www.sonestad.se/library/repository/static-moonactive-net-rewards-2021_GM406889139.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_off00002ef2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2EF2 21484 bytes
SHA-256: dcafbf6cc915dabaefe5acd63c79afa665bfb8da833d37c9d84d2e254122680f
font_01_sfnt_off00005d8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5D8A 18672 bytes
SHA-256: 8ef55fb4d9ba038590cd99f97770fa3f244966affa92085fda601291346fb9e1

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