Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3c86e98f7b28a62…

MALICIOUS

PDF

49.8 KB Created: 2021-06-10 23:36:06 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-24
MD5: 3233f8fe688da5b258fa5a2eae47eef3 SHA-1: 36485cb947c445c6687d7e6557c2a24f70193784 SHA-256: b3c86e98f7b28a6266415035b2133014b4ee8afeb591b56e4b33c250e662c9d0
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external sites, many of which are identified as malicious redirectors or part of a link farm. The document body, though partially corrupted, suggests a lure related to 'game hacks' and 'free generators', aligning with phishing or malware distribution tactics. The presence of multiple PDF links and a critical heuristic for malicious redirectors indicates a high likelihood of this document being used to drive traffic to malicious infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9796

Heuristics 5

  • 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.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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.tw/app/431946152/how-to-get-free-knives-in-assassin-roblox-2021-game-hack In PDF document text
    • https://e-learning-mi-nurussaadah.com/__statics/gudangsoal/files/hacks-for-free-robux-on-roblox-no-human-verify_GM431946152.pdfIn PDF document text
    • https://e-learning-mi-nurussaadah.com/__statics/gudangsoal/files/roblox-highschool-2-hack-script-pastebin-money_GM431946152.pdfIn PDF document text
    • https://e-learning-mi-nurussaadah.com/__statics/gudangsoal/files/coin-master-free-coins-link-2021-deutsch_GM406889139.pdfIn PDF document text
    • https://e-learning-mi-nurussaadah.com/__statics/gudangsoal/files/free-robux-generator-no-verification_GM431946152.pdfIn PDF document text
    • https://e-learning-mi-nurussaadah.com/__statics/gudangsoal/files/doctor-louie-roblox_GM431946152.pdfIn PDF document text
    • https://e-learning-mi-nurussaadah.com/__statics/gudangsoal/files/roblox-adopt-me-how-to-get-free-bucks_GM431946152.pdfIn PDF document text
    • https://e-learning-mi-nurussaadah.com/__statics/gudangsoal/files/collect-free-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • https://e-learning-mi-nurussaadah.com/__statics/gudangsoal/files/coin-master-free-spins-link-2021-hack_GM406889139.pdfIn PDF document text
    • https://e-learning-mi-nurussaadah.com/__statics/gudangsoal/files/coin-master-free-spins-and-coins-today-gift-reward_GM406889139.pdfIn PDF document text
    • https://e-learning-mi-nurussaadah.com/__statics/gudangsoal/files/coin-master-hacks-for-iphone_GM406889139.pdfIn PDF document text
    • https://e-learning-mi-nurussaadah.com/__statics/gudangsoal/files/roblox-hack-client_GM431946152.pdfIn PDF document text
    • https://e-learning-mi-nurussaadah.com/__statics/gudangsoal/files/free-avatar-in-roblox-2021_GM431946152.pdfIn PDF document text
    • https://e-learning-mi-nurussaadah.com/__statics/gudangsoal/files/free-spins-promo-code-for-coin-master_GM406889139.pdfIn PDF document text
    • https://e-learning-mi-nurussaadah.com/__statics/gudangsoal/files/minecraft-pocket-edition-free_GM479516143.pdfIn PDF document text
    • https://e-learning-mi-nurussaadah.com/__statics/gudangsoal/files/coin-master-rewards-free-spins_GM406889139.pdfIn PDF document text
    • https://e-learning-mi-nurussaadah.com/__statics/gudangsoal/files/coin-master-hacks_GM406889139.pdfIn PDF document text
    • https://e-learning-mi-nurussaadah.com/__statics/gudangsoal/files/coin-master-fan_GM406889139.pdfIn PDF document text
    • https://e-learning-mi-nurussaadah.com/__statics/gudangsoal/files/free-robux-real-2021_GM431946152.pdfIn PDF document text
    • https://e-learning-mi-nurussaadah.com/__statics/gudangsoal/files/coin-master-daily-link_GM406889139.pdfIn PDF document text
    • https://e-learning-mi-nurussaadah.com/__statics/gudangsoal/files/how-to-get-minecraft-coins-for-free_GM479516143.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00005378.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5378 26084 bytes
SHA-256: ea581094fb5de30f02d2c905fe971f9a3150e03c16f452f70a7ff3b073b80a49
font_01_sfnt_off0000902e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x902E 5696 bytes
SHA-256: 450e3ee45915afe13702bf1d587eb8b9ad88a8d2113419ac9f2fd116a828e139
font_02_sfnt_off00009d3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9D3F 19080 bytes
SHA-256: daef4dbaaf4b32d2557bffd93b59c10981f6fc8d62a6b58f37aa31a2f6695a8b