Malicious PDF — malware analysis report

Static analysis result for SHA-256 71f610ec01473d5c…

MALICIOUS

PDF

35.0 KB Created: 2021-06-20 12:42:29 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-26
MD5: a1a5960be752fd09ee059d37b52113c2 SHA-1: cf2fae40527293399a58444bb6ba5ee95d051b29 SHA-256: 71f610ec01473d5ceae709c19fcfe3da03fe7cd25fe239ee33c9b84b902ba4b1
160 Risk Score

Malware Insights

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

The PDF contains multiple links to a known malicious redirector, disguised as a generator for game hacks and currency. The document body and heuristics indicate a lure for free Robux or game cheats, aiming to direct users to the malicious URL. While no scripts were extracted, the PDF structure and embedded links strongly suggest it's designed to exploit user interest in free in-game items to lead them to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 http://netcdn.co/app/431946152/appbounty-net-free-robux-game-hack In PDF document text
    • https://library.iuli.ac.id/repository/get-free-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • https://library.iuli.ac.id/repository/minecraft-pe-hack-client_GM479516143.pdfIn PDF document text
    • https://library.iuli.ac.id/repository/coin-master-daily-free-spins-link-facebook_GM406889139.pdfIn PDF document text
    • https://library.iuli.ac.id/repository/roblox-cheat-engine-2021_GM431946152.pdfIn PDF document text
    • https://library.iuli.ac.id/repository/wwwrobloxcom-cheat-codes_GM431946152.pdfIn PDF document text
    • https://library.iuli.ac.id/repository/lazy-blocks-com-free-robux_GM431946152.pdfIn PDF document text
    • https://library.iuli.ac.id/repository/free-coins-and-spins-in-coin-master_GM406889139.pdfIn PDF document text
    • https://library.iuli.ac.id/repository/cheat-engine-roblox-weight-lifting-simulator_GM431946152.pdfIn PDF document text
    • https://library.iuli.ac.id/repository/free-no-survery-robux_GM431946152.pdfIn PDF document text
    • https://library.iuli.ac.id/repository/coin-master-hack-to-get-free-spins_GM406889139.pdfIn PDF document text
    • https://library.iuli.ac.id/repository/mcpe-master-unlimited-coins-hack-apk_GM406889139.pdfIn PDF document text
    • https://library.iuli.ac.id/repository/how-to-get-free-robux-without-verification-2021_GM431946152.pdfIn PDF document text
    • https://library.iuli.ac.id/repository/get-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • https://library.iuli.ac.id/repository/coin-master-hack-https-coinms-net_GM406889139.pdfIn PDF document text
    • https://library.iuli.ac.id/repository/is-free-robux-real_GM431946152.pdfIn PDF document text
    • https://library.iuli.ac.id/repository/kupcake-hack-roblox-64-bits_GM431946152.pdfIn PDF document text
    • https://library.iuli.ac.id/repository/roblox-money-hack_GM431946152.pdfIn PDF document text
    • https://library.iuli.ac.id/repository/free-robux-place_GM431946152.pdfIn PDF document text
    • https://library.iuli.ac.id/repository/coin-master-free-spin-whatsapp-group_GM406889139.pdfIn PDF document text
    • https://library.iuli.ac.id/repository/free-roblox-adder_GM431946152.pdfIn PDF document text
    • https://www.roblox.com/.IIn 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
font_00_sfnt_off000030cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x30CD 22692 bytes
SHA-256: a3e5ccc0597c89f8580fa4c0768646ac2b8fd9e2a8f39fa86b38a2a95a01fc88
font_01_sfnt_off00006344.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6344 19176 bytes
SHA-256: e06cc085a72d0e62e3510df4d381c285e24e2e1d44f1b90b6dfea39d3362c5e4

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