Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd39b85284ca903e…

MALICIOUS

PDF

35.7 KB Created: 2021-07-05 13:45:55 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-07
MD5: bdaebae608cd8c73fa48b95dd2c5c388 SHA-1: 453a7ce54e24baf65a5ca89d69ffb3b73e6a13b0 SHA-256: cd39b85284ca903ed68919bf43edc93c448370b0b0136c82c02bdabe5f5db09f
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links to a known malicious redirector, specifically http://netcdn.tw/app/406889139/coin-master-daily-free-spins-link-today-game-hack. This redirector is used to lure victims with promises of free game items and hacks, likely leading to further malicious content or downloads. The presence of embedded URLs and the ML classifier's high confidence score support this assessment.

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.tw/app/406889139/coin-master-daily-free-spins-link-today-game-hack In PDF document text
    • https://e-learning.mtsn2-kotabekasi.sch.id/__statics/gudangsoal/files/how-to-get-minecraft-on-chromebook-for-free_GM479516143.pdfIn PDF document text
    • https://e-learning.mtsn2-kotabekasi.sch.id/__statics/gudangsoal/files/coin-master-free-spin-and-coins-links-2021_GM406889139.pdfIn PDF document text
    • https://e-learning.mtsn2-kotabekasi.sch.id/__statics/gudangsoal/files/bloxpink-free-robux_GM431946152.pdfIn PDF document text
    • https://e-learning.mtsn2-kotabekasi.sch.id/__statics/gudangsoal/files/free-roblox-gea_GM431946152.pdfIn PDF document text
    • https://e-learning.mtsn2-kotabekasi.sch.id/__statics/gudangsoal/files/free-coin-master-links_GM406889139.pdfIn PDF document text
    • https://e-learning.mtsn2-kotabekasi.sch.id/__statics/gudangsoal/files/avatar-de-roblox_GM431946152.pdfIn PDF document text
    • https://e-learning.mtsn2-kotabekasi.sch.id/__statics/gudangsoal/files/robux-matchcomfree-robux_GM431946152.pdfIn PDF document text
    • https://e-learning.mtsn2-kotabekasi.sch.id/__statics/gudangsoal/files/play-minecraft-pocket-edition-for-free_GM479516143.pdfIn PDF document text
    • https://e-learning.mtsn2-kotabekasi.sch.id/__statics/gudangsoal/files/how-to-get-free-minecraft-skins_GM479516143.pdfIn PDF document text
    • https://e-learning.mtsn2-kotabekasi.sch.id/__statics/gudangsoal/files/boku-no-roblox-hack_GM431946152.pdfIn PDF document text
    • https://e-learning.mtsn2-kotabekasi.sch.id/__statics/gudangsoal/files/roblox-group-free-robux_GM431946152.pdfIn PDF document text
    • https://e-learning.mtsn2-kotabekasi.sch.id/__statics/gudangsoal/files/how-to-make-a-minecraft-server-for-free-java_GM479516143.pdfIn PDF document text
    • https://e-learning.mtsn2-kotabekasi.sch.id/__statics/gudangsoal/files/free-robux-generator-no-human-verification-or-survey-2021_GM431946152.pdfIn PDF document text
    • https://e-learning.mtsn2-kotabekasi.sch.id/__statics/gudangsoal/files/how-to-hack-rb-world-2-roblox_GM431946152.pdfIn PDF document text
    • https://e-learning.mtsn2-kotabekasi.sch.id/__statics/gudangsoal/files/hack-coin-master-pc_GM406889139.pdfIn PDF document text
    • https://e-learning.mtsn2-kotabekasi.sch.id/__statics/gudangsoal/files/rewards-roblox-com_GM431946152.pdfIn PDF document text
    • https://e-learning.mtsn2-kotabekasi.sch.id/__statics/gudangsoal/files/games-like-coin-master-for-free_GM406889139.pdfIn PDF document text
    • https://e-learning.mtsn2-kotabekasi.sch.id/__statics/gudangsoal/files/free-roblox-generator_GM431946152.pdfIn PDF document text
    • https://e-learning.mtsn2-kotabekasi.sch.id/__statics/gudangsoal/files/roblox-robux_GM431946152.pdfIn PDF document text
    • https://e-learning.mtsn2-kotabekasi.sch.id/__statics/gudangsoal/files/cool-free-roblox-avatars_GM431946152.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_off0000328b.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x328B 23208 bytes
SHA-256: 7e9bd93d5fc2abd260be6e3dc381a7c489fea72e0cee33c9a66d32be853f3a64
font_01_sfnt_off000066ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x66EF 18940 bytes
SHA-256: 5cc00af5396ac6d0bbe2617822e874747972297797067d6a5c9a01e6a5c32b4c

Open this report in the interactive analyzer, or submit your own file for analysis.