Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb7851832889358e…

MALICIOUS

PDF

35.5 KB Created: 2021-06-26 14:27:00 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-27
MD5: ed3f0be6799c120bbdd201df3a75c522 SHA-1: c48d1976d37486226cfc680698be0fe5ad1d0f52 SHA-256: bb7851832889358ec746ca485df62dc9536d5374fe474863cd2b2591a10e37f4
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a lure related to 'free Robux' and game hacks, directing users to a suspicious URL. This URL is flagged as malicious and part of a redirector infrastructure. The document body and heuristics indicate a social engineering tactic to trick users into visiting a malicious site, likely to download further malware or engage in phishing.

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/secret-skin-combination-get-free-robux-game-hack In PDF document text
    • https://www.wco.org.uk/uploads/files/files/free-roblox-accounts-with-robux-2021_GM431946152.pdfIn PDF document text
    • https://www.wco.org.uk/uploads/files/files/free-robux-link_GM431946152.pdfIn PDF document text
    • https://www.wco.org.uk/uploads/files/files/roblox-apocalypse-rising-hack_GM431946152.pdfIn PDF document text
    • https://www.wco.org.uk/uploads/files/files/huskybuckscom-free-robux_GM431946152.pdfIn PDF document text
    • https://www.wco.org.uk/uploads/files/files/coin-master-35-16-hack-apk_GM406889139.pdfIn PDF document text
    • https://www.wco.org.uk/uploads/files/files/cheated-roblox-gun_GM431946152.pdfIn PDF document text
    • https://www.wco.org.uk/uploads/files/files/roblox-hack-fly-on-he-tycoons_GM431946152.pdfIn PDF document text
    • https://www.wco.org.uk/uploads/files/files/cm-free-spins_GM406889139.pdfIn PDF document text
    • https://www.wco.org.uk/uploads/files/files/coin-master-free-coin-hack_GM406889139.pdfIn PDF document text
    • https://www.wco.org.uk/uploads/files/files/114-hacks_GM479516143.pdfIn PDF document text
    • https://www.wco.org.uk/uploads/files/files/get-free-robux-generator_GM431946152.pdfIn PDF document text
    • https://www.wco.org.uk/uploads/files/files/minecraft-java-for-free_GM479516143.pdfIn PDF document text
    • https://www.wco.org.uk/uploads/files/files/coin-master-free-spins-without-verification_GM406889139.pdfIn PDF document text
    • https://www.wco.org.uk/uploads/files/files/minecraft-svg-images-free_GM479516143.pdfIn PDF document text
    • https://www.wco.org.uk/uploads/files/files/hack-spin-coin-master-2021_GM406889139.pdfIn PDF document text
    • https://www.wco.org.uk/uploads/files/files/free-robux-generator-no-human-verification-2021_GM431946152.pdfIn PDF document text
    • https://www.wco.org.uk/uploads/files/files/earn-free-robux-for-roblox_GM431946152.pdfIn PDF document text
    • https://www.wco.org.uk/uploads/files/files/working-roblox-hacking-dll_GM431946152.pdfIn PDF document text
    • https://www.wco.org.uk/uploads/files/files/free-robux-stream_GM431946152.pdfIn PDF document text
    • https://www.wco.org.uk/uploads/files/files/pokemon-go-free-7-day-research-reward_GM1094591345.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00003152.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3152 23024 bytes
SHA-256: 597ddbedf63821609d3763efdce6ae9d9178db006a78bc00d10094d028124dc0
font_01_sfnt_off00006521.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6521 19372 bytes
SHA-256: b5eca41f2bddbf1954fc8ca8ecaecde1ac6e56f8dff54d0bbfd4e9497c019287

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