Malicious PDF — malware analysis report

Static analysis result for SHA-256 224440c392084ceb…

MALICIOUS

PDF

42.4 KB Created: 2021-05-11 04:32:02 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-24
MD5: 9949f35dd6712923a691bf3bfc183778 SHA-1: 98f1416ab9cb8b0c749147846da02b85e5b327cb SHA-256: 224440c392084ceb4997f5fd14122f1d543781a2384829894be04f10494d2db9
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links designed to lure users to external sites, with one specific URL identified as a malicious redirector. The document body, though partially corrupted, contains text related to 'free coins and spins' and a game hack, aligning with the heuristic findings. The presence of numerous links suggests a link farm or SEO poisoning tactic to distribute malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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.xyz/app/406889139/free-coins-and-spins-for-coin-master-game-hack In PDF document text
    • http://perpustakaan.pa-jember.go.id/repository/minecraft-free-download-windows_GM479516143.pdfIn PDF document text
    • http://perpustakaan.pa-jember.go.id/repository/how-to-hack-roblox-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://perpustakaan.pa-jember.go.id/repository/coin-master-free-coins-and-spins_GM406889139.pdfIn PDF document text
    • http://perpustakaan.pa-jember.go.id/repository/roblox-avatar-tester_GM431946152.pdfIn PDF document text
    • http://perpustakaan.pa-jember.go.id/repository/free-apk-mods-coin-master_GM406889139.pdfIn PDF document text
    • http://perpustakaan.pa-jember.go.id/repository/free-google-play-promo-codes-coin-master_GM406889139.pdfIn PDF document text
    • http://perpustakaan.pa-jember.go.id/repository/free-rare-cards-for-coin-master-christmas_GM406889139.pdfIn PDF document text
    • http://perpustakaan.pa-jember.go.id/repository/coin-master-free-spins-facebook_GM406889139.pdfIn PDF document text
    • http://perpustakaan.pa-jember.go.id/repository/mcpe-master-coin-hack-apk_GM406889139.pdfIn PDF document text
    • http://perpustakaan.pa-jember.go.id/repository/robuxlove-net-free-robux_GM431946152.pdfIn PDF document text
    • http://perpustakaan.pa-jember.go.id/repository/free-spins-coin-master-blogspot_GM406889139.pdfIn PDF document text
    • http://perpustakaan.pa-jember.go.id/repository/free-robux-clothes_GM431946152.pdfIn PDF document text
    • http://perpustakaan.pa-jember.go.id/repository/coin-master-card-collection-link_GM406889139.pdfIn PDF document text
    • http://perpustakaan.pa-jember.go.id/repository/minecraft-java-hacks_GM479516143.pdfIn PDF document text
    • http://perpustakaan.pa-jember.go.id/repository/coin-master-free-attack-link_GM406889139.pdfIn PDF document text
    • http://perpustakaan.pa-jember.go.id/repository/free-robux-websites-2021_GM431946152.pdfIn PDF document text
    • http://perpustakaan.pa-jember.go.id/repository/coin-master-free-spain_GM406889139.pdfIn PDF document text
    • http://perpustakaan.pa-jember.go.id/repository/free-robux-2021_GM431946152.pdfIn PDF document text
    • http://perpustakaan.pa-jember.go.id/repository/coin-master-free-coins-link-facebook_GM406889139.pdfIn PDF document text
    • http://perpustakaan.pa-jember.go.id/repository/how-to-gain-more-spins-on-coin-master-for-free_GM406889139.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
stream_003_off00004a1e.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4A1E 25572 bytes
SHA-256: 258a7d2b166aedfd7a1864b6f1fec31c4a6134654f223021f7feb36f70687a21
font_01_sfnt_off00008416.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8416 18060 bytes
SHA-256: f1068137021f01f6b5cc3550273fdf5362b49e27ffe305b66dd7920a08d48120

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