Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a928506cc9c6920…

MALICIOUS

PDF

43.8 KB Created: 2021-05-11 08:07:59 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-27
MD5: fb9c9e00b12b3908c1f8b89ac55861ec SHA-1: dedace2b262befcd19abb9ccf9c7d282a913603a SHA-256: 1a928506cc9c6920f1d5d70482f21b36ab4f73dfe039e8f12ac7197af4afc65c
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a lure for a "free Robux quiz game hack" which redirects to malicious infrastructure. The embedded URLs and the primary redirector URL are indicative of a phishing or scam campaign designed to trick users into visiting potentially harmful sites. Although no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to deliver a malicious payload or redirect to a phishing page.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

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.xyz/app/431946152/free-robux-quiz-game-hack In PDF document text
    • http://library.persadabunda.ac.id/repository/roblox-premium-free_GM431946152.pdfIn PDF document text
    • http://library.persadabunda.ac.id/repository/free-robux-com-real_GM431946152.pdfIn PDF document text
    • http://library.persadabunda.ac.id/repository/free-spins-coin-master-links-2021_GM406889139.pdfIn PDF document text
    • http://library.persadabunda.ac.id/repository/coin-master-cheats-2021_GM406889139.pdfIn PDF document text
    • http://library.persadabunda.ac.id/repository/minecraft-free-trial_GM479516143.pdfIn PDF document text
    • http://library.persadabunda.ac.id/repository/free-robux-codes-2021-real_GM431946152.pdfIn PDF document text
    • http://library.persadabunda.ac.id/repository/how-to-cheat-in-roblox_GM431946152.pdfIn PDF document text
    • http://library.persadabunda.ac.id/repository/coin-master-game-free-download_GM406889139.pdfIn PDF document text
    • http://library.persadabunda.ac.id/repository/how-to-get-800-robux-for-free_GM431946152.pdfIn PDF document text
    • http://library.persadabunda.ac.id/repository/freespinandcoin-blogspot-coin-master_GM406889139.pdfIn PDF document text
    • http://library.persadabunda.ac.id/repository/coin-master-daily-free-spins-link_GM406889139.pdfIn PDF document text
    • http://library.persadabunda.ac.id/repository/how-to-get-free-robux-no-survey_GM431946152.pdfIn PDF document text
    • http://library.persadabunda.ac.id/repository/roblox-girl-avatar_GM431946152.pdfIn PDF document text
    • http://library.persadabunda.ac.id/repository/coin-master-free-spins-cheat_GM406889139.pdfIn PDF document text
    • http://library.persadabunda.ac.id/repository/moonactive-free-spins_GM406889139.pdfIn PDF document text
    • http://library.persadabunda.ac.id/repository/get-me-free-robux_GM431946152.pdfIn PDF document text
    • http://library.persadabunda.ac.id/repository/free-minecraft-bedrock_GM479516143.pdfIn PDF document text
    • http://library.persadabunda.ac.id/repository/free-roblox-intros_GM431946152.pdfIn PDF document text
    • http://library.persadabunda.ac.id/repository/spin-coin-master-free_GM406889139.pdfIn PDF document text
    • http://library.persadabunda.ac.id/repository/uprobuxcom-free-robux_GM431946152.pdfIn PDF document text
    • https://www.bandicam.comIn 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_off000048ca.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x48CA 27480 bytes
SHA-256: 9f57847f9e7c2c1f17c72388ca7a1f8d64d911f6438fef38ce0fa34d33ef6f4d
font_01_sfnt_off000088be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x88BE 18376 bytes
SHA-256: b52519a3f27e6183245bec6d77d3cda93d913202ea7147b0d6d9048d316cd5fc

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