Malicious PDF — malware analysis report

Static analysis result for SHA-256 3603c699424a7b02…

MALICIOUS

PDF

51.2 KB Created: 2021-06-09 13:58:12 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 7368276f5950fed376f3b92ab5cb3974 SHA-1: 088ea73b93615ec3ada4a2e1bf48b6b83bb34346 SHA-256: 3603c699424a7b02087b17f95f30bc25d18e1151c3900d6038345ed96e8c9783
180 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links to a malicious redirector and a raw IP address, masquerading as a 'free generator' or 'game hack' lure. The document body text and embedded URLs reinforce this social engineering tactic. The primary function appears to be directing users to potentially malicious websites through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9724

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.
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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-do-you-get-1m-robux-for-free-game-hack In PDF document text
    • http://103.40.122.33/akasia/repository/coin-master-free-spins-link-download_GM406889139.pdfPDF link annotation
    • http://103.40.122.33/akasia/repository/free-tiktok-likes-trial_GM835599320.pdfIn PDF document text
    • http://103.40.122.33/akasia/repository/free-robux-generator-without-human-verification_GM431946152.pdfIn PDF document text
    • http://103.40.122.33/akasia/repository/free-robux-in-1-sec_GM431946152.pdfIn PDF document text
    • http://103.40.122.33/akasia/repository/minecraft-114-4-download-free_GM479516143.pdfIn PDF document text
    • http://103.40.122.33/akasia/repository/minecraft-free-download-ios_GM479516143.pdfIn PDF document text
    • http://103.40.122.33/akasia/repository/coin-master-free-spins-link-2021-today_GM406889139.pdfIn PDF document text
    • http://103.40.122.33/akasia/repository/minecraft-education-edition-free_GM479516143.pdfIn PDF document text
    • http://103.40.122.33/akasia/repository/how-to-get-free-robux-roblox-generator_GM431946152.pdfIn PDF document text
    • http://103.40.122.33/akasia/repository/free-robux-without-human-verification-2021_GM431946152.pdfIn PDF document text
    • http://103.40.122.33/akasia/repository/roblox-free-robux-com_GM431946152.pdfIn PDF document text
    • http://103.40.122.33/akasia/repository/roblox-studio-free-robux_GM431946152.pdfIn PDF document text
    • http://103.40.122.33/akasia/repository/how-to-hack-a-roblox-account-easy_GM431946152.pdfIn PDF document text
    • http://103.40.122.33/akasia/repository/free-robux-hack-2021_GM431946152.pdfIn PDF document text
    • http://103.40.122.33/akasia/repository/tiktok-free-vpn_GM835599320.pdfIn PDF document text
    • http://103.40.122.33/akasia/repository/rbl-gg-free-robux_GM431946152.pdfIn PDF document text
    • http://103.40.122.33/akasia/repository/free-robux-no-siging-i-n_GM431946152.pdfIn PDF document text
    • http://103.40.122.33/akasia/repository/get-free-robux-fast-and-easy-no-offer-no-verification_GM431946152.pdfIn PDF document text
    • http://103.40.122.33/akasia/repository/coin-master-free-spins-link-blogspot-2021_GM406889139.pdfIn PDF document text
    • http://103.40.122.33/akasia/repository/minecraft-bedrock-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_off000051fa.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x51FA 23944 bytes
SHA-256: 6f3e41a28abad21342636d4d33fd3a59e00bb2fa807a18371bc4e805eba30eff
font_01_sfnt_off0000889e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x889E 8132 bytes
SHA-256: e6d68e720ea5acf9dccbf7ffde18db6f65c62a99ab7725aa43e30329033a7787
font_02_sfnt_off0000a38b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA38B 18976 bytes
SHA-256: a16b62c1181a7f29ecc8173f809cd9a4e140c3aa07a7721082abf89bf72e12d3

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