Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd4a58a757d6e9d3…

MALICIOUS

PDF

27.3 KB Created: 2021-05-10 17:34:09 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-22
MD5: ca7a5f770508b146140af6ea1685d977 SHA-1: 4e5a40c07ad04f1a65be05ecc0a4d6ed470425ac SHA-256: fd4a58a757d6e9d33a3424851cd7aeda29261a075fc7251bbe4f0d0fc6fe91e7
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains embedded links that lead to a malicious redirector infrastructure, specifically promoting 'free Robux' or game hacks. The ML classifier strongly indicated maliciousness, and the document body itself contains obfuscated text and URLs pointing to potentially harmful content. No scripts were extracted, but the primary attack vector appears to be social engineering via deceptive links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 3

  • 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.
  • 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-free-robux-game-hack In PDF document text
    • https://elearning.mtsn6blitar.com/__statics/gudangsoal/files/hacks-to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://elearning.mtsn6blitar.com/__statics/gudangsoal/files/daily-spins-coin-master_GM406889139.pdfIn PDF document text
    • https://elearning.mtsn6blitar.com/__statics/gudangsoal/files/hey-google-how-do-you-get-free-robux_GM431946152.pdfIn PDF document text
    • https://elearning.mtsn6blitar.com/__statics/gudangsoal/files/free-robux-no-scam_GM431946152.pdfIn PDF document text
    • https://elearning.mtsn6blitar.com/__statics/gudangsoal/files/minecraft-nintendo-switch-digital-code-free_GM479516143.pdfIn PDF document text
    • https://elearning.mtsn6blitar.com/__statics/gudangsoal/files/how-to-get-robux-on-phone_GM431946152.pdfIn PDF document text
    • https://elearning.mtsn6blitar.com/__statics/gudangsoal/files/coin-master-free-spin-and-coins-links-2021_GM406889139.pdfIn PDF document text
    • https://elearning.mtsn6blitar.com/__statics/gudangsoal/files/coin-master-free-spins-daily_GM406889139.pdfIn PDF document text
    • https://elearning.mtsn6blitar.com/__statics/gudangsoal/files/coin-master-free-food_GM406889139.pdfIn PDF document text
    • https://elearning.mtsn6blitar.com/__statics/gudangsoal/files/coin-master-hack-no-human-verification-2021_GM406889139.pdfIn PDF document text
    • https://elearning.mtsn6blitar.com/__statics/gudangsoal/files/roblox-phantom-forces-hack_GM431946152.pdfIn PDF document text
    • https://elearning.mtsn6blitar.com/__statics/gudangsoal/files/coin-master-heaven-free-spins-link-2021_GM406889139.pdfIn PDF document text
    • https://elearning.mtsn6blitar.com/__statics/gudangsoal/files/how-do-u-get-free-robux-2021_GM431946152.pdfIn PDF document text
    • https://elearning.mtsn6blitar.com/__statics/gudangsoal/files/free-minecraft-hacks_GM479516143.pdfIn PDF document text
    • https://elearning.mtsn6blitar.com/__statics/gudangsoal/files/www-robux_GM431946152.pdfIn PDF document text
    • https://elearning.mtsn6blitar.com/__statics/gudangsoal/files/robuxglobalcom_GM431946152.pdfIn PDF document text
    • https://elearning.mtsn6blitar.com/__statics/gudangsoal/files/robux-hack-no-human-verification_GM431946152.pdfIn PDF document text
    • https://elearning.mtsn6blitar.com/__statics/gudangsoal/files/coin-master-free-spins-hack_GM406889139.pdfIn PDF document text
    • https://elearning.mtsn6blitar.com/__statics/gudangsoal/files/coin-master-free-coins-and-spins_GM406889139.pdfIn PDF document text
    • https://elearning.mtsn6blitar.com/__statics/gudangsoal/files/how-to-get-roblox-money_GM431946152.pdfIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004ad3.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4AD3 12158 bytes
SHA-256: bd8c86df346ea838d936b8dcee74bcab9cb9085c5f8c3c4391e8257a61f70b39

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