Malicious PDF — malware analysis report

Static analysis result for SHA-256 b42e016902b55b89…

MALICIOUS

PDF

35.3 KB Created: 2021-07-06 07:25:49 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-24
MD5: 8a65c9496407a113df0fc5076bd58ab6 SHA-1: 5943a6bda9fe0c9b87af1e0db87b6f2c47e80084 SHA-256: b42e016902b55b89dc603c31377454b4775c6948b63f97b3848e39799963fc8d
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple heuristics indicating it is a malicious redirector lure, specifically targeting users interested in game hacks and free currency. The document body and embedded URLs point to a redirector hosted on 'netcdn.tw', which is known malicious infrastructure. No scripts were extracted, but the primary attack pattern is social engineering via a malicious link.

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/431946152/real-free-robux-generator-game-hack In PDF document text
    • http://katalog.ireyogya.org/repository/how-to-get-your-hacked-account-back-on-roblox-2021_GM431946152.pdfIn PDF document text
    • http://katalog.ireyogya.org/repository/coin-master-hack-apk-2021-ios_GM406889139.pdfIn PDF document text
    • http://katalog.ireyogya.org/repository/free-roblox-accounts-2021-with-robux_GM431946152.pdfIn PDF document text
    • http://katalog.ireyogya.org/repository/irobux-com-redeem_GM431946152.pdfIn PDF document text
    • http://katalog.ireyogya.org/repository/mcpe-hack-client_GM479516143.pdfIn PDF document text
    • http://katalog.ireyogya.org/repository/coin-master-free-coins-and-spins-daily-summary_GM406889139.pdfIn PDF document text
    • http://katalog.ireyogya.org/repository/free-money-in-adopt-me-roblox_GM431946152.pdfIn PDF document text
    • http://katalog.ireyogya.org/repository/free-robux-2021-unlimited-codes-for-kids_GM431946152.pdfIn PDF document text
    • http://katalog.ireyogya.org/repository/free-robux-codes-9-3-19_GM431946152.pdfIn PDF document text
    • http://katalog.ireyogya.org/repository/download-coin-master-apk-hacked_GM406889139.pdfIn PDF document text
    • http://katalog.ireyogya.org/repository/rise-of-nations-hack-roblox_GM431946152.pdfIn PDF document text
    • http://katalog.ireyogya.org/repository/coin-master-free-spins-link-download-free_GM406889139.pdfIn PDF document text
    • http://katalog.ireyogya.org/repository/camping-hacks-roblox_GM431946152.pdfIn PDF document text
    • http://katalog.ireyogya.org/repository/how-do-i-get-free-robux_GM431946152.pdfIn PDF document text
    • http://katalog.ireyogya.org/repository/coin-master-fan-page-free-spins_GM406889139.pdfIn PDF document text
    • http://katalog.ireyogya.org/repository/roblox-pizza-tycoon-money-hack_GM431946152.pdfIn PDF document text
    • http://katalog.ireyogya.org/repository/how-to-change-roblox-username-for-free-2021_GM431946152.pdfIn PDF document text
    • http://katalog.ireyogya.org/repository/counter-blox-roblox-offensive-wall-hacks-2021_GM431946152.pdfIn PDF document text
    • http://katalog.ireyogya.org/repository/how-to-get-free-robux-hack_GM431946152.pdfIn PDF document text
    • http://katalog.ireyogya.org/repository/free-robux-by-watching-ads_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_off000031aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x31AA 22992 bytes
SHA-256: 71c125ff9c9b4c294288aa967c4126704b272ede107740f474f81648b24871bb
font_01_sfnt_off0000654b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x654B 18896 bytes
SHA-256: 7d09d8ebe20d9048014fae4c420031d848702cb5d655c08a08acd3bd87a1ba6a

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