Malicious PDF — malware analysis report

Static analysis result for SHA-256 90c87f7b507eb11b…

MALICIOUS

PDF

35.0 KB Created: 2021-07-04 02:55:32 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 8bc64c7a5baaca0da2c1080c8a50d03e SHA-1: 5638c74c884018b1eb92bec0e1c092c2d1ef93f1 SHA-256: 90c87f7b507eb11b2cdaf94c5a040a64358d2e29830407f2a0f987980de33ae8
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains embedded links that redirect to malicious infrastructure, specifically promoting 'game hacks' and 'robux generators'. The primary link, http://netcdn.tw/app/431946152/robux-hack-2021-game-hack, is identified as a malicious redirector. The document body and heuristics indicate a lure designed to trick users into clicking these links, likely leading to further malware downloads or scams. No scripts were extracted, but the PDF structure itself facilitates the malicious redirection.

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/431946152/robux-hack-2021-game-hack In PDF document text
    • https://e-learning.mtsn2-kotabekasi.sch.id/__statics/gudangsoal/files/how-to-download-roblox-robux-hack_GM431946152.pdfIn PDF document text
    • https://e-learning.mtsn2-kotabekasi.sch.id/__statics/gudangsoal/files/free-roblox-promo-codes-march-21-2021-twitter_GM431946152.pdfIn PDF document text
    • https://e-learning.mtsn2-kotabekasi.sch.id/__statics/gudangsoal/files/master-coin-hack-mod_GM406889139.pdfIn PDF document text
    • https://e-learning.mtsn2-kotabekasi.sch.id/__statics/gudangsoal/files/free-robux-gift-card-codes_GM431946152.pdfIn PDF document text
    • https://e-learning.mtsn2-kotabekasi.sch.id/__statics/gudangsoal/files/robux-generator-com_GM431946152.pdfIn PDF document text
    • https://e-learning.mtsn2-kotabekasi.sch.id/__statics/gudangsoal/files/free-robux-master_GM431946152.pdfIn PDF document text
    • https://e-learning.mtsn2-kotabekasi.sch.id/__statics/gudangsoal/files/minecraft-free_GM479516143.pdfIn PDF document text
    • https://e-learning.mtsn2-kotabekasi.sch.id/__statics/gudangsoal/files/how-to-free-robux_GM431946152.pdfIn PDF document text
    • https://e-learning.mtsn2-kotabekasi.sch.id/__statics/gudangsoal/files/robux-website-free_GM431946152.pdfIn PDF document text
    • https://e-learning.mtsn2-kotabekasi.sch.id/__statics/gudangsoal/files/free-tiktok-coins_GM835599320.pdfIn PDF document text
    • https://e-learning.mtsn2-kotabekasi.sch.id/__statics/gudangsoal/files/get-free-spins-on-coin-master-links_GM406889139.pdfIn PDF document text
    • https://e-learning.mtsn2-kotabekasi.sch.id/__statics/gudangsoal/files/coin-master-hack-version-2021-free-download_GM406889139.pdfIn PDF document text
    • https://e-learning.mtsn2-kotabekasi.sch.id/__statics/gudangsoal/files/best-minecraft-hacks_GM479516143.pdfIn PDF document text
    • https://e-learning.mtsn2-kotabekasi.sch.id/__statics/gudangsoal/files/minecraft-jar-free_GM479516143.pdfIn PDF document text
    • https://e-learning.mtsn2-kotabekasi.sch.id/__statics/gudangsoal/files/free-coin-master-hacks_GM406889139.pdfIn PDF document text
    • https://e-learning.mtsn2-kotabekasi.sch.id/__statics/gudangsoal/files/free-attacks-coin-master_GM406889139.pdfIn PDF document text
    • https://e-learning.mtsn2-kotabekasi.sch.id/__statics/gudangsoal/files/free-robux-no-verification-or-survey_GM431946152.pdfIn PDF document text
    • https://e-learning.mtsn2-kotabekasi.sch.id/__statics/gudangsoal/files/roblox-free-online-download_GM431946152.pdfIn PDF document text
    • https://e-learning.mtsn2-kotabekasi.sch.id/__statics/gudangsoal/files/safe-hack-for-coin-master-android_GM406889139.pdfIn PDF document text
    • https://e-learning.mtsn2-kotabekasi.sch.id/__statics/gudangsoal/files/flip-master-free-coins_GM406889139.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
font_00_sfnt_off0000316d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x316D 22356 bytes
SHA-256: 0e976f7a1c7a6e57cc4ac99da09e9cf33a4757731e68f447caba26acaeb539db
font_01_sfnt_off00006337.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6337 19124 bytes
SHA-256: a01abce438ace15ff0d22223d5cc83267d648dadbc6e7de58085c68645cb2558

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