Malicious PDF — malware analysis report

Static analysis result for SHA-256 a92841d23815b7aa…

MALICIOUS

PDF

43.9 KB Created: 2021-05-13 08:35:49 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-15
MD5: fb15cda61502c8c6138c0bdc5aa17c28 SHA-1: 77de5260a5970f7e60b39f6120dbe4286e4db715 SHA-256: a92841d23815b7aaec93f5adb01fda071030277e4a527802e6907605ab3863c7
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF document contains embedded links that redirect to a known malicious domain, masquerading as a game hack generator. The ML classifier also flagged this PDF with high confidence. The primary attack pattern involves luring the user to click on a link that leads to malicious infrastructure, likely for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

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 https://netcdn.xyz/app/406889139/daily-free-spins-coin-master-2021-game-hack In PDF document text
    • https://aits.co.id/ckfinder/userfiles/files/free-robux-without-survey_GM431946152.pdfIn PDF document text
    • https://aits.co.id/ckfinder/userfiles/files/how-to-get-free-cards-on-coin-master_GM406889139.pdfIn PDF document text
    • https://aits.co.id/ckfinder/userfiles/files/coin-master-freebies-2021_GM406889139.pdfIn PDF document text
    • https://aits.co.id/ckfinder/userfiles/files/easiest-coin-master-hack_GM406889139.pdfIn PDF document text
    • https://aits.co.id/ckfinder/userfiles/files/free-google-play-promo-codes-coin-master_GM406889139.pdfIn PDF document text
    • https://aits.co.id/ckfinder/userfiles/files/how-to-hack-coin-master-spin-ios_GM406889139.pdfIn PDF document text
    • https://aits.co.id/ckfinder/userfiles/files/how-many-levels-are-there-in-coin-master_GM406889139.pdfIn PDF document text
    • https://aits.co.id/ckfinder/userfiles/files/minecraft-bedrock-edition-download-pc-free_GM479516143.pdfIn PDF document text
    • https://aits.co.id/ckfinder/userfiles/files/how-to-get-free-robux-no-verification-2021_GM431946152.pdfIn PDF document text
    • https://aits.co.id/ckfinder/userfiles/files/how-to-hack-roblox-accounts-2021_GM431946152.pdfIn PDF document text
    • https://aits.co.id/ckfinder/userfiles/files/best-free-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • https://aits.co.id/ckfinder/userfiles/files/orewards-com-free-robux_GM431946152.pdfIn PDF document text
    • https://aits.co.id/ckfinder/userfiles/files/no-scam-free-robux_GM431946152.pdfIn PDF document text
    • https://aits.co.id/ckfinder/userfiles/files/minecraft-login-free_GM479516143.pdfIn PDF document text
    • https://aits.co.id/ckfinder/userfiles/files/free-coin-and-spin-in-coin-master_GM406889139.pdfIn PDF document text
    • https://aits.co.id/ckfinder/userfiles/files/https-oprewards-com-roblox_GM431946152.pdfIn PDF document text
    • https://aits.co.id/ckfinder/userfiles/files/daily-coin-master-free-spin-link_GM406889139.pdfIn PDF document text
    • https://aits.co.id/ckfinder/userfiles/files/websites-that-give-you-free-robux_GM431946152.pdfIn PDF document text
    • https://aits.co.id/ckfinder/userfiles/files/login-robux_GM431946152.pdfIn PDF document text
    • https://aits.co.id/ckfinder/userfiles/files/get-free-roblox_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004aaf.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4AAF 27840 bytes
SHA-256: 35c0de54f5619ed32a1dc955b60eab490bedbc19bb8fb533826750920aac3308
font_01_sfnt_off00008832.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8832 18708 bytes
SHA-256: 76af36f54327e394f6a0995f5c1804c6d580e71cb7eebf938ec25838add40309

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