Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc8a31cc08952281…

MALICIOUS

PDF

35.0 KB Created: 2021-07-05 22:47:10 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-21
MD5: a669e4d83e4c207755e61e3c9f3cd430 SHA-1: 731f6ea56ca03cf0585699967e52066f9282ba28 SHA-256: dc8a31cc08952281d52c051ff2afb64c308ce80a79851fc7c0b7b2fa21d0138e
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links designed to lure users into clicking on them, promising free in-game items or hacks. These links redirect to known malicious infrastructure and a large number of SEO-optimized PDF files, indicating a phishing or scam campaign. 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 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 http://netcdn.tw/app/835599320/tiktok-free-20-likes-game-hack In PDF document text
    • http://e-library.dharmawangsa.ac.id/repository/free-robux-com-no-verification_GM431946152.pdfIn PDF document text
    • http://e-library.dharmawangsa.ac.id/repository/robux-generator-no-human-verification-2021_GM431946152.pdfIn PDF document text
    • http://e-library.dharmawangsa.ac.id/repository/coin-master-daily-free-spins-link-2021_GM406889139.pdfIn PDF document text
    • http://e-library.dharmawangsa.ac.id/repository/coin-master-hack-app-download-free_GM406889139.pdfIn PDF document text
    • http://e-library.dharmawangsa.ac.id/repository/free-100-robux_GM431946152.pdfIn PDF document text
    • http://e-library.dharmawangsa.ac.id/repository/get-free-robux-without-human-verification_GM431946152.pdfIn PDF document text
    • http://e-library.dharmawangsa.ac.id/repository/coin-master-hack-without-verification_GM406889139.pdfIn PDF document text
    • http://e-library.dharmawangsa.ac.id/repository/robux-hack-generator_GM431946152.pdfIn PDF document text
    • http://e-library.dharmawangsa.ac.id/repository/coin-master-spin-and-coins-free_GM406889139.pdfIn PDF document text
    • http://e-library.dharmawangsa.ac.id/repository/coin-master-free-redeem-code_GM406889139.pdfIn PDF document text
    • http://e-library.dharmawangsa.ac.id/repository/roblox-free-rixty-account-live_GM431946152.pdfIn PDF document text
    • http://e-library.dharmawangsa.ac.id/repository/free-robux-generator-com-roblox-hack_GM431946152.pdfIn PDF document text
    • http://e-library.dharmawangsa.ac.id/repository/free-spin-coin_GM406889139.pdfIn PDF document text
    • http://e-library.dharmawangsa.ac.id/repository/roblox-mobile-money-cheats_GM431946152.pdfIn PDF document text
    • http://e-library.dharmawangsa.ac.id/repository/coin-master-free-link-spin_GM406889139.pdfIn PDF document text
    • http://e-library.dharmawangsa.ac.id/repository/coin-master-cards-hack-2021_GM406889139.pdfIn PDF document text
    • http://e-library.dharmawangsa.ac.id/repository/how-to-get-2021202120219b-robux-for-free_GM431946152.pdfIn PDF document text
    • http://e-library.dharmawangsa.ac.id/repository/how-to-download-minecraft-windows-10-edition-for-free_GM479516143.pdfIn PDF document text
    • http://e-library.dharmawangsa.ac.id/repository/how-to-cheat-in-roblox-mad-city_GM431946152.pdfIn PDF document text
    • http://e-library.dharmawangsa.ac.id/repository/free-robux-generator-no-survey-no-download-no-human-verification_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
font_00_sfnt_off000033c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x33C7 22428 bytes
SHA-256: 2fadb1cb7c7e55f1253a202f2a417a73d9b8ca9a23600502e14ebce9fe205c0e
font_01_sfnt_off000065e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x65E1 18268 bytes
SHA-256: 3060db96db4cea4fbf2275e0db84a4e9d8dcd1796cb5767cab12bcf0c5ddd65e

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