Malicious PDF — malware analysis report

Static analysis result for SHA-256 617ad43cd6345e0e…

MALICIOUS

PDF

45.4 KB Created: 2021-06-07 03:41:28 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 8b7eafb1ca38330bfe4243a958e8a74e SHA-1: d6a41d0428a70d0d27570b0c800a04758e40250d SHA-256: 617ad43cd6345e0e3c28ee770c9de5e75aa4ccb5be53fcc568f870d48193f41c
220 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are identified as malicious redirectors or part of a link farm. The document body and heuristics indicate a lure for game-related cheats and free items, a common tactic for distributing malware or phishing for credentials. While no scripts were explicitly extracted, the PDF structure and embedded links suggest a potential for JavaScript execution or exploitation to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9864

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 https://netcdn.tw/app/431946152/roblox-groups-that-give-you-free-clothes-game-hack In PDF document text
    • http://akbidprimahusada.ac.id/elibrary/repository/coin-master-links-free-spins_GM406889139.pdfIn PDF document text
    • http://akbidprimahusada.ac.id/elibrary//repository/rbxdemon_GM431946152.pdfIn PDF document text
    • http://akbidprimahusada.ac.id/elibrary//repository/wurst-18_GM479516143.pdfIn PDF document text
    • http://akbidprimahusada.ac.id/elibrary//repository/how-to-get-free-robux-on-computer_GM431946152.pdfIn PDF document text
    • http://akbidprimahusada.ac.id/elibrary/repository/hacks-for-rogoul-roblox-pllz-teach-me_GM431946152.pdfIn PDF document text
    • http://akbidprimahusada.ac.id/elibrary/repository/minecraft-bedrock-free_GM479516143.pdfIn PDF document text
    • http://akbidprimahusada.ac.id/elibrary//repository/hack-coin-master-spin-android_GM406889139.pdfIn PDF document text
    • http://akbidprimahusada.ac.id/elibrary/repository/coin-master-free-pet-snacks_GM406889139.pdfIn PDF document text
    • http://akbidprimahusada.ac.id/elibrary/repository/rbxoffers-earn-free-robux_GM431946152.pdfIn PDF document text
    • http://akbidprimahusada.ac.id/elibrary/repository/free-spins-promo-code-for-coin-master_GM406889139.pdfIn PDF document text
    • http://akbidprimahusada.ac.id/elibrary//repository/how-to-make-roblox-clothes-for-free_GM431946152.pdfIn PDF document text
    • http://akbidprimahusada.ac.id/elibrary/repository/coin-master-spin-hack-apk_GM406889139.pdfIn PDF document text
    • http://akbidprimahusada.ac.id/elibrary//repository/game-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://akbidprimahusada.ac.id/elibrary/repository/free-robux-no-human-verification-or-survey-or-download-2021_GM431946152.pdfIn PDF document text
    • http://akbidprimahusada.ac.id/elibrary/repository/coin-master-game_GM406889139.pdfIn PDF document text
    • http://akbidprimahusada.ac.id/elibrary//repository/coin-master-free-spins-and-free-coins_GM406889139.pdfIn PDF document text
    • http://akbidprimahusada.ac.id/elibrary//repository/free-robux-generator-2021-no-survey_GM431946152.pdfIn PDF document text
    • https://akbidprimahusada.ac.id/elibrary/repository/any-free-stuff-on-roblox_GM431946152.pdfIn PDF document text
    • http://akbidprimahusada.ac.id/elibrary/repository/how-many-levels-are-in-coin-master_GM406889139.pdfIn PDF document text
    • http://akbidprimahusada.ac.id/elibrary//repository/roblox-com-free-robux_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_004_off00005189.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5189 26536 bytes
SHA-256: 4a42c68a73be369332989008e2c97381c3a4bd5581dbebf7ddca9fa7ceb1d421
font_01_sfnt_off00008c73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8C73 19156 bytes
SHA-256: 99211bbf0c562aa8e6701fb4ba3dbc552466ca45edf3888f5393d5f9de64688e

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