Malicious PDF — malware analysis report

Static analysis result for SHA-256 abb6375b40ef68e4…

MALICIOUS

PDF

49.1 KB Created: 2021-06-03 16:32:08 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-24
MD5: f6f47c108c6fc2b89a7ca6d94c3b1fee SHA-1: 245b306435ca42bdb268fe8ef4b1ff065a195c0b SHA-256: abb6375b40ef68e479b52fc6db8d1badc0b90669f732328c6d218e3a4edfcc1a
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links to redirectors that masquerade as game hacks and free generators, aiming to trick users into downloading malicious content. The ML classifier strongly indicated maliciousness, and the presence of embedded URLs further supports a phishing or social engineering attack vector. No scripts were extracted, but the document's structure and embedded links are indicative of a downloader or redirector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9796

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.online/app/406889139/coin-master-free-coins-game-hack In PDF document text
    • https://www.andrology.co.uk/uploads/files/files/how-to-get-free-skins-in-minecraft_GM479516143.pdfIn PDF document text
    • https://www.andrology.co.uk/uploads/files/files/free-robux-generator-2021_GM431946152.pdfIn PDF document text
    • https://www.andrology.co.uk/uploads/files/files/free-robux-rewards_GM431946152.pdfIn PDF document text
    • https://www.andrology.co.uk/uploads/files/files/hack-coin-master-spin-apk_GM406889139.pdfIn PDF document text
    • https://www.andrology.co.uk/uploads/files/files/how-to-get-free-robux-easy-2021_GM431946152.pdfIn PDF document text
    • https://www.andrology.co.uk/uploads/files/files/coin-master-free-cards-2021_GM406889139.pdfIn PDF document text
    • https://www.andrology.co.uk/uploads/files/files/coin-master-game-free_GM406889139.pdfIn PDF document text
    • https://www.andrology.co.uk/uploads/files/files/real-free-robux-generator_GM431946152.pdfIn PDF document text
    • https://www.andrology.co.uk/uploads/files/files/who-to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://www.andrology.co.uk/uploads/files/files/hacks-for-minecraft-bedrock_GM479516143.pdfIn PDF document text
    • https://www.andrology.co.uk/uploads/files/files/how-to-get-free-robux-on-roblox-2021_GM431946152.pdfIn PDF document text
    • https://www.andrology.co.uk/uploads/files/files/free-robux-generator-no-survey_GM431946152.pdfIn PDF document text
    • https://www.andrology.co.uk/uploads/files/files/is-tiktok-free_GM835599320.pdfIn PDF document text
    • https://www.andrology.co.uk/uploads/files/files/op-rewards-robux_GM431946152.pdfIn PDF document text
    • https://www.andrology.co.uk/uploads/files/files/rbl-gg-free-robux_GM431946152.pdfIn PDF document text
    • https://www.andrology.co.uk/uploads/files/files/coin-master-generator-hack_GM406889139.pdfIn PDF document text
    • https://www.andrology.co.uk/uploads/files/files/best-free-hacked-client_GM479516143.pdfIn PDF document text
    • https://www.andrology.co.uk/uploads/files/files/roblox-hackprogamers-com_GM431946152.pdfIn PDF document text
    • https://www.andrology.co.uk/uploads/files/files/coin-master-free-coins_GM406889139.pdfIn PDF document text
    • https://www.andrology.co.uk/uploads/files/files/coin-master-free-spins-link-2021-ios_GM406889139.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off000053b3.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x53B3 26876 bytes
SHA-256: 9a07b738fe839a6603447e9d97242a28ff5acfacbf3cca77bda74dbea653ec9e
font_01_sfnt_off00009247.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9247 3820 bytes
SHA-256: fa56264fd04287589dcec548e2d31d7e94f0b33765a78886a499d244b69b69dd
font_02_sfnt_off00009ee2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9EE2 17712 bytes
SHA-256: 0afd6f2792edb83b7f2a0201a1e0a5eb12ca81ad868fb3e42742340ee6e5fb0e

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