Malicious PDF — malware analysis report

Static analysis result for SHA-256 0e0e7a9538c6e711…

MALICIOUS

PDF

32.7 KB Created: 2021-07-19 20:30:27 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-24
MD5: da2d9c8582cda948addb8c731e6963a7 SHA-1: 87a3d3cfacdb062966964f8cd72d7d1525a35991 SHA-256: 0e0e7a9538c6e711bea5732f2f7262d39780e7f4e323bb0e588b60b73bb9d0d0
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document contains multiple links to a redirector hosted on netcdn.tw, which is associated with malicious activity. The document body and embedded links suggest a lure for 'free Robux' or game hacks, a common social engineering tactic. The presence of embedded URLs and the ML classifier's high confidence score indicate a malicious intent to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9900

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.tw/app/431946152/robux-gift-card-free-game-hack In PDF document text
    • http://elearning.mtsn1kulonprogo.sch.id/__statics/gudangsoal/files/roblox-pink-free-robux_GM431946152.pdfIn PDF document text
    • http://elearning.mtsn1kulonprogo.sch.id/__statics/gudangsoal/files/how-to-download-minecraft-for-free-on-iphone_GM479516143.pdfIn PDF document text
    • http://elearning.mtsn1kulonprogo.sch.id/__statics/gudangsoal/files/get-minecraft-for-free_GM479516143.pdfIn PDF document text
    • http://elearning.mtsn1kulonprogo.sch.id/__statics/gudangsoal/files/how-to-get-minecraft-bedrock-edition-for-free_GM479516143.pdfIn PDF document text
    • http://elearning.mtsn1kulonprogo.sch.id/__statics/gudangsoal/files/how-to-get-free-robux-for-kids_GM431946152.pdfIn PDF document text
    • http://elearning.mtsn1kulonprogo.sch.id/__statics/gudangsoal/files/free-robux-giveaway_GM431946152.pdfIn PDF document text
    • http://elearning.mtsn1kulonprogo.sch.id/__statics/gudangsoal/files/coin-master-free-spins-promo-code_GM406889139.pdfIn PDF document text
    • http://elearning.mtsn1kulonprogo.sch.id/__statics/gudangsoal/files/free-robux-no-survey_GM431946152.pdfIn PDF document text
    • http://elearning.mtsn1kulonprogo.sch.id/__statics/gudangsoal/files/free-robux-games-that-actually-work_GM431946152.pdfIn PDF document text
    • http://elearning.mtsn1kulonprogo.sch.id/__statics/gudangsoal/files/free-online-minecraft-server_GM479516143.pdfIn 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
stream_002_off00002748.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x2748 23336 bytes
SHA-256: 3684bd301a96b87acfc5ec39521e0eb2ca571870f5a3cb2a2ebc32e7673df3f7
font_01_sfnt_off00005bf6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5BF6 18828 bytes
SHA-256: bb6ba787686cb78dc8bffd8aa27003d08d9877f569f527752ba86e56c9229aef

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