Malicious PDF — malware analysis report

Static analysis result for SHA-256 8bb21d22e92e88e2…

MALICIOUS

PDF

35.9 KB Created: 2021-06-24 22:24:38 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-13
MD5: a00e6e8ff03f032b888e8aef69d0497c SHA-1: 0cc71d397c5996e42c13fc8c26572414dd6bc5f3 SHA-256: 8bb21d22e92e88e26201de65330a117e05e03120a83d401efcf6b1747145f3b1
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links to external sites, including a known malicious redirector, designed to lure users into downloading further malicious content. The document body and heuristics indicate a scam related to game hacks and free currency, likely intended to trick users into downloading malware or visiting phishing sites. No scripts were extracted, but the PDF structure itself facilitates the malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 5

  • 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.
  • 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.co/app/406889139/coin-master-free-spins-ios-2021-game-hack In PDF document text
    • https://anlathich.com/public/upload/files/free-robux-generator-2021-no-survey_GM431946152.pdfIn PDF document text
    • https://anlathich.com/public/upload/files/fake-roblox-online-free_GM431946152.pdfIn PDF document text
    • https://anlathich.com/public/upload/files/free-robux-not-a-scam_GM431946152.pdfIn PDF document text
    • https://anlathich.com/public/upload/files/coin-master-free-spins-link-blogspot-today_GM406889139.pdfIn PDF document text
    • https://anlathich.com/public/upload/files/roblox-song-id-young-wild-and-free_GM431946152.pdfIn PDF document text
    • https://anlathich.com/public/upload/files/coin-master-free-spins-link-today-new_GM406889139.pdfIn PDF document text
    • https://anlathich.com/public/upload/files/ways-to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://anlathich.com/public/upload/files/code-card-roblox-free_GM431946152.pdfIn PDF document text
    • https://anlathich.com/public/upload/files/roblox-hack-2021_GM431946152.pdfIn PDF document text
    • https://anlathich.com/public/upload/files/roblox-darth-vader-helmet-free_GM431946152.pdfIn PDF document text
    • https://anlathich.com/public/upload/files/free-robux-glitch-2021_GM431946152.pdfIn PDF document text
    • https://anlathich.com/public/upload/files/free-robux-generator-for-roblox-2021_GM431946152.pdfIn PDF document text
    • https://anlathich.com/public/upload/files/hack-spin-coin-master_GM406889139.pdfIn PDF document text
    • https://anlathich.com/public/upload/files/coin-master-free-spins-hack_GM406889139.pdfIn PDF document text
    • https://anlathich.com/public/upload/files/can-you-get-minecraft-for-free_GM479516143.pdfIn PDF document text
    • https://anlathich.com/public/upload/files/free-coins-and-spins-coin-master-2021_GM406889139.pdfIn PDF document text
    • https://anlathich.com/public/upload/files/cool-minecraft-hacks_GM479516143.pdfIn PDF document text
    • https://anlathich.com/public/upload/files/get-robux-com_GM431946152.pdfIn PDF document text
    • https://anlathich.com/public/upload/files/free-robux-with-no-human-verification_GM431946152.pdfIn PDF document text
    • https://anlathich.com/public/upload/files/how-to-get-free-robux-hack_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
stream_002_off0000338b.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x338B 23496 bytes
SHA-256: 26e6ca7dd7e286f37d58aecf437b2d829a002a49d864fb3211f823b5ae7fa49b
font_01_sfnt_off000068e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x68E0 18576 bytes
SHA-256: bdb7eb4b0c987fabfdeddf6ffa08cf8c77719a95579d43b31b6c5264ffa85722

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