Malicious PDF — malware analysis report

Static analysis result for SHA-256 41fb999556b89f3d…

MALICIOUS

PDF

45.3 KB Created: 2021-06-04 00:15:36 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-04
MD5: da982737df72bdd5268eda3ca2c1b960 SHA-1: a8ebee83a2ff45bb953a90f248083b70d69bca49 SHA-256: 41fb999556b89f3d9006417af7418c8d958596e211be672714c2f4322ab40f38
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, routes users through malicious redirector infrastructure and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9864

Heuristics 5

  • 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.
  • PDF links to a 'free generator / game hack' redirector high 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.
  • 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
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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/431946152/synapse-roblox-free-game-hack PDF link annotation
    • https://library.sdksantamariabwi.sch.id/repository/free-robux-no-survey-or-human-verification_GM431946152.pdfIn PDF document text
    • https://library.sdksantamariabwi.sch.id/repository/roblox-skin-free_GM431946152.pdfIn PDF document text
    • https://library.sdksantamariabwi.sch.id/repository/coin-master-mod-apk-2021_GM406889139.pdfIn PDF document text
    • https://library.sdksantamariabwi.sch.id/repository/abd-roblox_GM431946152.pdfIn PDF document text
    • https://library.sdksantamariabwi.sch.id/repository/how-to-download-minecraft-for-free-on-android_GM479516143.pdfIn PDF document text
    • https://library.sdksantamariabwi.sch.id/repository/legit-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • https://library.sdksantamariabwi.sch.id/repository/moon-static-coin-master-generator-hacks-free_GM406889139.pdfIn PDF document text
    • https://library.sdksantamariabwi.sch.id/repository/minecraft-pocket-edition-free-ios_GM479516143.pdfIn PDF document text
    • https://library.sdksantamariabwi.sch.id/repository/i-cant-get-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • https://library.sdksantamariabwi.sch.id/repository/collect-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • https://library.sdksantamariabwi.sch.id/repository/how-to-hack-someones-account-on-roblox_GM431946152.pdfIn PDF document text
    • https://library.sdksantamariabwi.sch.id/repository/roblox40com-robux_GM431946152.pdfIn PDF document text
    • https://library.sdksantamariabwi.sch.id/repository/free-robux-discord_GM431946152.pdfIn PDF document text
    • https://library.sdksantamariabwi.sch.id/repository/can-i-get-free-robux_GM431946152.pdfIn PDF document text
    • https://library.sdksantamariabwi.sch.id/repository/legitimate-coin-master-free-spins-apk_GM406889139.pdfIn PDF document text
    • https://library.sdksantamariabwi.sch.id/repository/coin-master-card-collection-hack_GM406889139.pdfIn PDF document text
    • https://library.sdksantamariabwi.sch.id/repository/como-descargar-coin-master-hackeado_GM406889139.pdfIn PDF document text
    • https://library.sdksantamariabwi.sch.id/repository/coin-master-link_GM406889139.pdfIn PDF document text
    • https://library.sdksantamariabwi.sch.id/repository/robux-link_GM431946152.pdfIn PDF document text
    • https://library.sdksantamariabwi.sch.id/repository/free-spins-coin-master-blogspot_GM406889139.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
font_00_sfnt_off000051c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x51C0 25760 bytes
SHA-256: f2b3bbee8834d9ba64ea1e55f897e25f5680b6641ce8e290d1928efc43bf40d3
font_01_sfnt_off00008dd1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8DD1 18532 bytes
SHA-256: f2f65d939d1654862c473f31792bb3f0ee87d7638af2cc9574134150feb2cc2e

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