Malicious PDF — malware analysis report

Static analysis result for SHA-256 d528e9d0c48267d4…

MALICIOUS

PDF

34.8 KB Created: 2021-07-05 14:50:19 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-01
MD5: 14adc6e6628209b9153cb84c5519c788 SHA-1: 56ef0079f51029146a2d4ec2dd651cefaced16ec SHA-256: d528e9d0c48267d45ea413d5515c184a214ad8ec516952cc513815579278af41
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 0.9980

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 http://netcdn.tw/app/406889139/how-to-get-free-coins-on-coin-master-hack-game-hack PDF link annotation
    • http://pustaka.stikesperintis.ac.id/repository/free-spin-coin-master-2021-link_GM406889139.pdfIn PDF document text
    • http://pustaka.stikesperintis.ac.id/repository/coin-master-game-2021-free-spin-link_GM406889139.pdfIn PDF document text
    • http://pustaka.stikesperintis.ac.id/repository/hacks-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://pustaka.stikesperintis.ac.id/repository/roblox-how-to-get-free-lvl-7-hack_GM431946152.pdfIn PDF document text
    • http://pustaka.stikesperintis.ac.id/repository/how-to-get-free-golden-card-in-coin-master_GM406889139.pdfIn PDF document text
    • http://pustaka.stikesperintis.ac.id/repository/how-to-get-minecraft-windows-10-for-free_GM479516143.pdfIn PDF document text
    • http://pustaka.stikesperintis.ac.id/repository/get-free-robux-info_GM431946152.pdfIn PDF document text
    • http://pustaka.stikesperintis.ac.id/repository/coin-master-free-cards_GM406889139.pdfIn PDF document text
    • http://pustaka.stikesperintis.ac.id/repository/how-to-get-minecraft-for-free-on-xbox_GM479516143.pdfIn PDF document text
    • http://pustaka.stikesperintis.ac.id/repository/at-which-game-have-free-robux-at-roblox_GM431946152.pdfIn PDF document text
    • http://pustaka.stikesperintis.ac.id/repository/coin-master-hack-2021-without-human-verification_GM406889139.pdfIn PDF document text
    • http://pustaka.stikesperintis.ac.id/repository/roblox-hack-generator_GM431946152.pdfIn PDF document text
    • http://pustaka.stikesperintis.ac.id/repository/minecraft-ps4-code-free_GM479516143.pdfIn PDF document text
    • http://pustaka.stikesperintis.ac.id/repository/offers-to-get-free-spins-in-coin-master_GM406889139.pdfIn PDF document text
    • http://pustaka.stikesperintis.ac.id/repository/how-to-get-free-robux-for-real_GM431946152.pdfIn PDF document text
    • http://pustaka.stikesperintis.ac.id/repository/is-there-a-free-coding-platform-for-roblox_GM431946152.pdfIn PDF document text
    • http://pustaka.stikesperintis.ac.id/repository/free-robux-generator-for-roblox-2021_GM431946152.pdfIn PDF document text
    • http://pustaka.stikesperintis.ac.id/repository/coin-master-hack-online_GM406889139.pdfIn PDF document text
    • http://pustaka.stikesperintis.ac.id/repository/free-minecraft-java-account_GM479516143.pdfIn PDF document text
    • http://pustaka.stikesperintis.ac.id/repository/pastebin-roblox-hack_GM431946152.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
font_00_sfnt_off0000327c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x327C 22740 bytes
SHA-256: 466006f5d62c9b7554120a14eb2a4e9066301322ba90c9e4ed1e47bf58462f24
font_01_sfnt_off00006548.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6548 18332 bytes
SHA-256: 5b878530e69a12175dbf01b0ca128da18827fe0c1663de911774679428d069c4