Malicious PDF — malware analysis report

Static analysis result for SHA-256 93534010c6c801d1…

MALICIOUS

PDF

45.0 KB Created: 2021-06-07 13:21:18 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: bdbfa144cfa6e2a5f82594adb4f68c82 SHA-1: 9f278b8ee739127e494afddf36d30ec535aef58f SHA-256: 93534010c6c801d18b4d8be4792bdc943539f4a2c8a1c85090ddf30f01a627e2
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 0.9865

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.tw/app/431946152/roblox-shinobi-life-free-hack-game-hack PDF link annotation
    • https://cluster-consulting.com/images/oprewards-com-login_GM431946152.pdfIn PDF document text
    • https://cluster-consulting.com/images/coin-master-free-spins-link-no-verification-code_GM406889139.pdfIn PDF document text
    • https://cluster-consulting.com/images/is-minecraft-bedrock-edition-free_GM479516143.pdfIn PDF document text
    • https://cluster-consulting.com/images/coin-master-heaven-free-daily-spins_GM406889139.pdfIn PDF document text
    • https://cluster-consulting.com/images/can-you-play-minecraft-for-free_GM479516143.pdfIn PDF document text
    • https://cluster-consulting.com/images/coin-master-hack-2021-no-survey_GM406889139.pdfIn PDF document text
    • https://cluster-consulting.com/images/how-to-minecraft-for-free_GM479516143.pdfIn PDF document text
    • https://cluster-consulting.com/images/minecraft-for-free-on-phone_GM479516143.pdfIn PDF document text
    • https://cluster-consulting.com/images/free-spin-link-coin-master-today_GM406889139.pdfIn PDF document text
    • https://cluster-consulting.com/images/coin-master-hack-without-verification_GM406889139.pdfIn PDF document text
    • https://cluster-consulting.com/images/roblox-games-that-have-free-boomboxes_GM431946152.pdfIn PDF document text
    • https://cluster-consulting.com/images/coin-master-hacks-free-spins_GM406889139.pdfIn PDF document text
    • https://cluster-consulting.com/images/is-minecraft-free-on-pc_GM479516143.pdfIn PDF document text
    • https://cluster-consulting.com/images/minecraft-hacks_GM479516143.pdfIn PDF document text
    • https://cluster-consulting.com/images/free-robux-without-human-verification_GM431946152.pdfIn PDF document text
    • https://cluster-consulting.com/images/freerobuxclubor_GM431946152.pdfIn PDF document text
    • https://cluster-consulting.com/images/coin-master-links-free-spins_GM406889139.pdfIn PDF document text
    • https://cluster-consulting.com/images/free-views-on-tiktok_GM835599320.pdfIn PDF document text
    • https://cluster-consulting.com/images/free-robux-place_GM431946152.pdfIn PDF document text
    • https://cluster-consulting.com/images/how-to-get-free-robux-on-pc_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_off00005055.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5055 25724 bytes
SHA-256: 510b530cfaa6d3481725fb5620e37c9ac78d31f1493a8a7cee03b77ab4912059
font_01_sfnt_off00008c8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8C8D 18632 bytes
SHA-256: 567b3defa4150023923ce50217df0c3e67bfad43bbbf635e6322792a4b54bb14

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