Malicious PDF — malware analysis report

Static analysis result for SHA-256 d9d8ca87af57847c…

MALICIOUS

PDF

42.4 KB Created: 2021-05-15 14:55:07 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 7cf565ebec8c52f4959a288876fcba16 SHA-1: f0a888fa49cd75c34e095e573776944ba98bd395 SHA-256: d9d8ca87af57847c04b2834cebb2ac87797f5b083724be8a63677c39a38f2d58
280 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document is designed to trick users into clicking links that lead to game hack generators and potentially malicious redirectors. The document body and heuristics indicate a lure for 'free spins' and 'game hacks', with multiple links pointing to such content. The presence of a 'secret recovery' lure suggests an attempt to harvest sensitive user credentials or private keys.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

Heuristics 6

  • 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.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Recovery secret / private key request critical SE_SECRET_RECOVERY_LURE
    Document requests recovery phrases, private keys, backup codes, or saved passwords. Requests for these secrets in a document are high-risk.
  • 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.xyz/app/406889139/free-spins-coin-master-haktuts-game-hack In PDF document text
    • http://zercalo.org/images/how-to-hack-coin-master-ios-2021_GM406889139.pdfIn PDF document text
    • http://zercalo.org/images/lazy-blocks-com-free-robux_GM431946152.pdfIn PDF document text
    • http://zercalo.org/images/how-to-get-free-spins-on-coin-master-2021-iphone_GM406889139.pdfIn PDF document text
    • http://zercalo.org/images/how-to-get-free-spins-on-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://zercalo.org/images/how-to-get-free-cards-for-coin-master_GM406889139.pdfIn PDF document text
    • http://zercalo.org/images/master-game_GM406889139.pdfIn PDF document text
    • http://zercalo.org/images/coin-master-hack-tool-2021_GM406889139.pdfIn PDF document text
    • http://zercalo.org/images/free-spin-link-for-coin-master-haktuts_GM406889139.pdfIn PDF document text
    • http://zercalo.org/images/free-robux-just-click_GM431946152.pdfIn PDF document text
    • http://zercalo.org/images/free-script-executor-roblox_GM431946152.pdfIn PDF document text
    • http://zercalo.org/images/coin-master-hack-pro-gamers_GM406889139.pdfIn PDF document text
    • http://zercalo.org/images/coin-master-rewards-app_GM406889139.pdfIn PDF document text
    • http://zercalo.org/images/how-to-get-minecraft-pocket-edition-for-free_GM479516143.pdfIn PDF document text
    • http://zercalo.org/images/coin-master-hack-without-verification_GM406889139.pdfIn PDF document text
    • http://zercalo.org/images/coin-master-free-spins-no-generator_GM406889139.pdfIn PDF document text
    • http://zercalo.org/images/how-do-you-get-free-robux-on-roblox_GM431946152.pdfIn PDF document text
    • http://zercalo.org/images/is-minecraft-free-on-xbox-one_GM479516143.pdfIn PDF document text
    • http://zercalo.org/images/free-robux-hack-2021_GM431946152.pdfIn PDF document text
    • http://zercalo.org/images/free-minecraft-account-and-password-2021_GM479516143.pdfIn PDF document text
    • http://zercalo.org/images/coin-master-spin-rewards_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
stream_003_off0000491e.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x491E 25232 bytes
SHA-256: fcc051fb5bf8c18fa380edef786df853b8948c1b9c77f0d85cc07cbd8587459b
font_01_sfnt_off000083a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x83A7 18196 bytes
SHA-256: fd8ee59660af8c9e4664936919e7b5321f93298eaf8e2ea805d6f2ae56b4a3b6

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