Malicious PDF — malware analysis report

Static analysis result for SHA-256 82fd2234fbd9d254…

MALICIOUS

PDF

41.9 KB Created: 2021-05-17 05:08:24 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 6e5eed722f04aa7b0406bf4656ebe1b6 SHA-1: 6b243d33cdf8d4558388cdf13239be0b0165e392 SHA-256: 82fd2234fbd9d25499aefe58ba6f4380488c45c69811b4c37df8a4d94d75c5f8
188 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple links to known malicious redirectors, disguised as "free generator / game hack" lures. The document body also contains similar URLs, reinforcing the malicious intent. The embedded JavaScript and redirector links suggest an attempt to download or redirect the user to a malicious payload or phishing site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

Heuristics 6

  • 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.
  • Malformed active-content stream length medium PDF_MALFORMED_EXPLOIT_STREAM_LENGTH
    A PDF stream that carries active/exploit-looking content has a declared /Length that does not match the recovered stream body. Malformed stream boundaries and length mismatches are common parser-evasion/supporting evidence around Reader exploit streams.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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/406889139/free-games-like-coin-master-game-hack In PDF document text
    • http://dcmetroapp.com/images/how-to-get-a-lot-of-robux_GM431946152.pdfIn PDF document text
    • http://dcmetroapp.com/images/info-roblox-com-robux_GM431946152.pdfIn PDF document text
    • http://dcmetroapp.com/images/oprewards-login_GM431946152.pdfIn PDF document text
    • http://dcmetroapp.com/images/free-robux-2021_GM431946152.pdfIn PDF document text
    • http://dcmetroapp.com/images/how-to-hack-roblox-accounts_GM431946152.pdfIn PDF document text
    • http://dcmetroapp.com/images/facebook-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://dcmetroapp.com/images/how-to-hack-coin-master-without-root_GM406889139.pdfIn PDF document text
    • http://dcmetroapp.com/images/how-to-get-free-roebucks-without-verification_GM431946152.pdfIn PDF document text
    • http://dcmetroapp.com/images/coin-master_GM406889139.pdfIn PDF document text
    • http://dcmetroapp.com/images/coin-master-rewards-free-spins_GM406889139.pdfIn PDF document text
    • http://dcmetroapp.com/images/coin-master-app_GM406889139.pdfIn PDF document text
    • http://dcmetroapp.com/images/how-to-get-minecraft-for-free-on-laptop_GM479516143.pdfIn PDF document text
    • http://dcmetroapp.com/images/free-robux-com_GM431946152.pdfIn PDF document text
    • http://dcmetroapp.com/images/get-free-lives-on-coin-master_GM406889139.pdfIn PDF document text
    • http://dcmetroapp.com/images/minecraft-classic-free_GM479516143.pdfIn PDF document text
    • http://dcmetroapp.com/images/coin-master-daily-free-spins-link-facebook_GM406889139.pdfIn PDF document text
    • http://dcmetroapp.com/images/free-robux-master_GM431946152.pdfIn PDF document text
    • http://dcmetroapp.com/images/free-spins-and-coins-coin-master-links_GM406889139.pdfIn PDF document text
    • http://dcmetroapp.com/images/minecraft-hacked-client-download_GM479516143.pdfIn PDF document text
    • http://dcmetroapp.com/images/websites-that-give-you-free-robux_GM431946152.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
stream_003_off00004870.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4870 26412 bytes
SHA-256: e4a0430da42959a7392d5650ac7fea95139fe7a7062c28eb8ef0ac212c928bcd
font_01_sfnt_off00008205.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8205 18140 bytes
SHA-256: 0fa8c8b4839815decb7824e6abfd23c338a1fcad8391028ddb14be23d50d94bc

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