Malicious PDF — malware analysis report

Static analysis result for SHA-256 0dc85372b90cccb0…

MALICIOUS

PDF

47.7 KB Created: 2021-05-13 03:06:36 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 7d2db9e7ab53d58c203ddf404cbd5e8f SHA-1: e9fcb2a813b329eaaf63da39378bb27b437c4c0b SHA-256: 0dc85372b90cccb0148feaf3acd6b5326d5e6f4a391c9111ad21f3d8ff23e122
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 0.9013

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.xyz/app/431946152/free-robux-come-game-hack PDF link annotation
    • http://heddalboring.no/images/how-to-get-hacks-on-roblox_GM431946152.pdfIn PDF document text
    • http://heddalboring.no/images/how-to-actually-get-free-robux_GM431946152.pdfIn PDF document text
    • http://heddalboring.no/images/coin-master-free-spin-link-new_GM406889139.pdfIn PDF document text
    • http://heddalboring.no/images/coinmaster-free-spins-link_GM406889139.pdfIn PDF document text
    • http://heddalboring.no/images/how-to-get-free-robux-com_GM431946152.pdfIn PDF document text
    • http://heddalboring.no/images/how-to-get-free-robux-hack-2021_GM431946152.pdfIn PDF document text
    • http://heddalboring.no/images/free-robux-redeem-codes_GM431946152.pdfIn PDF document text
    • http://heddalboring.no/images/how-to-get-free-robux-fast_GM431946152.pdfIn PDF document text
    • http://heddalboring.no/images/how-to-hack-roblox-for-robux_GM431946152.pdfIn PDF document text
    • http://heddalboring.no/images/hack-coin-pro-coin-master_GM406889139.pdfIn PDF document text
    • http://heddalboring.no/images/roblox-robux-hack-generator_GM431946152.pdfIn PDF document text
    • http://heddalboring.no/images/download-hacked-games-com-coin-master_GM406889139.pdfIn PDF document text
    • http://heddalboring.no/images/free-robux-on-ipad_GM431946152.pdfIn PDF document text
    • http://heddalboring.no/images/ww-robux_GM431946152.pdfIn PDF document text
    • http://heddalboring.no/images/free-robux-no-human-verification-or-survey-2021_GM431946152.pdfIn PDF document text
    • http://heddalboring.no/images/free-daily-spins-and-coins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://heddalboring.no/images/coin-master-hack-apk-no-fb-login_GM406889139.pdfIn PDF document text
    • http://heddalboring.no/images/oprewards-robux_GM431946152.pdfIn PDF document text
    • http://heddalboring.no/images/roblox-free-pets_GM431946152.pdfIn PDF document text
    • http://heddalboring.no/images/free-minecraft-java-code_GM479516143.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004890.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4890 31352 bytes
SHA-256: faadbc3d05b0dc346f9c08978c211c7f39cfa3b5714708cd0e2448d29d481cd4
font_01_sfnt_off00008e24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8E24 2880 bytes
SHA-256: 10d025f04f706eb71cdda4f99784df1b9ccb52e48080e43095e0398eaef6f132
font_02_sfnt_off0000980e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x980E 18276 bytes
SHA-256: d7491fe45cc88596c87233a963b6162720bf27c142cea717df16fbc09fa29ea6

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