Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9890defb91e4f41…

MALICIOUS

PDF

47.5 KB Created: 2021-06-03 12:12:27 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 53c58ed1457c2a7b725daca6d1b864cc SHA-1: 1b38775513e587c68b24954f1d3e1483a990499b SHA-256: c9890defb91e4f4108a0c39c2552ae76427540b655be5344a87887c326e2db6a
220 Risk Score

Malware Insights

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

The PDF document contains a malicious redirector URL disguised as a game hack generator, which is a common lure for phishing or malware distribution. The document also hosts a large number of external PDF links, suggesting an SEO manipulation tactic to drive traffic to malicious sites. No scripts were extracted, but the presence of redirectors and link farms indicates a likely intent to lead the user to a compromised site or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9769

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 https://netcdn.online/app/406889139/free-magical-chest-coin-master-game-hack In PDF document text
    • http://perpus.masda.ac.id//repository/spin-and-coin_GM406889139.pdfIn PDF document text
    • http://perpus.masda.ac.id//repository/coin-master-spin-hack-no-human-verification_GM406889139.pdfIn PDF document text
    • http://perpus.masda.ac.id/repository/coin-master-hack-september-2021_GM406889139.pdfIn PDF document text
    • http://perpus.masda.ac.id//repository/how-to-get-free-robux-app_GM431946152.pdfIn PDF document text
    • http://perpus.masda.ac.id//repository/coin-master-ios-gods-hack_GM406889139.pdfIn PDF document text
    • http://perpus.masda.ac.id/repository/master-8-ball-pool-free-coins_GM406889139.pdfIn PDF document text
    • http://perpus.masda.ac.id//repository/how-to-get-free-robux-without-downloading-apps-2021_GM431946152.pdfIn PDF document text
    • http://perpus.masda.ac.id//repository/get-free-robux-generator_GM431946152.pdfIn PDF document text
    • http://perpus.masda.ac.id//repository/roblox-fun-com-free-robux_GM431946152.pdfIn PDF document text
    • http://perpus.masda.ac.id/repository/minecraft-bedrock-edition-free_GM479516143.pdfIn PDF document text
    • http://perpus.masda.ac.id/repository/rblx-city-free-robux_GM431946152.pdfIn PDF document text
    • http://perpus.masda.ac.id/repository/how-to-get-free-pet-food-in-coin-master_GM406889139.pdfIn PDF document text
    • http://perpus.masda.ac.id/repository/free-spins-coin-master-app_GM406889139.pdfIn PDF document text
    • http://perpus.masda.ac.id/repository/coin-master-free-coins-2021_GM406889139.pdfIn PDF document text
    • http://perpus.masda.ac.id//repository/how-to-get-free-roblox_GM431946152.pdfIn PDF document text
    • http://perpus.masda.ac.id/repository/coin-master-hack-app-download-free_GM406889139.pdfIn PDF document text
    • http://perpus.masda.ac.id//repository/coin-master-daily-free-spins-link-2021_GM406889139.pdfIn PDF document text
    • http://perpus.masda.ac.id/repository/how-to-get-free-stuff-on-roblox_GM431946152.pdfIn PDF document text
    • http://perpus.masda.ac.id/repository/coin-master-free-in-app-purchases-jailbreak_GM406889139.pdfIn PDF document text
    • http://perpus.masda.ac.id//repository/free-robux-com-no-verification_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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off0000517c.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x517C 25060 bytes
SHA-256: a254fc1972d8219281feef16b39e91ae3f6e40f2b19bc6761a30d696c6071dc3
font_01_sfnt_off00008ac8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8AC8 3480 bytes
SHA-256: 478dd353832a132a16ae7ab34a1bec7e2e47fc8c43d893ad6c937ef603f99dce
font_02_sfnt_off00009711.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9711 18236 bytes
SHA-256: 304664d9ed281fb79aeb95754ceac3c6a3ffe8061556da78e549fdfc4060a293

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