Malicious PDF — malware analysis report

Static analysis result for SHA-256 89e05975895f3bfe…

MALICIOUS

PDF

42.7 KB Created: 2021-05-16 15:35:05 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 539caa6b62715362d09b390c56589caf SHA-1: 49dcb1a27a0ae1381ece943a32db214b9cc73526 SHA-256: 89e05975895f3bfe9cac090a8fbae6abb96b4ae6ec4623f7a6f065690d1c01f1
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 0.9971

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/406889139/coin-master-free-spins-moonactive-game-hack PDF link annotation
    • http://facingachild.org/images/daily-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • http://facingachild.org/images/free-coins-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://facingachild.org/images/robux-com-free_GM431946152.pdfIn PDF document text
    • http://facingachild.org/images/free-robux-no-human-verification-or-survey-2021_GM431946152.pdfIn PDF document text
    • http://facingachild.org/images/coin-master-free-spins-hack-no-human-verification_GM406889139.pdfIn PDF document text
    • http://facingachild.org/images/how-to-change-your-username-on-roblox-for-free-2021_GM431946152.pdfIn PDF document text
    • http://facingachild.org/images/minecraft-bedrock-edition-pc-free_GM479516143.pdfIn PDF document text
    • http://facingachild.org/images/roblox-rape-hack_GM431946152.pdfIn PDF document text
    • http://facingachild.org/images/minecraft-pe-apk-download-free-015-0_GM479516143.pdfIn PDF document text
    • http://facingachild.org/images/how-to-block-someone-on-coin-master_GM406889139.pdfIn PDF document text
    • http://facingachild.org/images/how-to-get-free-robux-2021_GM431946152.pdfIn PDF document text
    • http://facingachild.org/images/daily-coin-master-free-spin-link_GM406889139.pdfIn PDF document text
    • http://facingachild.org/images/free-spins-coin-master-links-twitter_GM406889139.pdfIn PDF document text
    • http://facingachild.org/images/how-to-get-free-robux-easy-hack_GM431946152.pdfIn PDF document text
    • http://facingachild.org/images/coin-master-cheat-free_GM406889139.pdfIn PDF document text
    • http://facingachild.org/images/how-do-i-get-free-robux-on-roblox_GM431946152.pdfIn PDF document text
    • http://facingachild.org/images/100-free-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://facingachild.org/images/robux-free-online_GM431946152.pdfIn PDF document text
    • http://facingachild.org/images/roblox-gift-card-online-free_GM431946152.pdfIn PDF document text
    • http://facingachild.org/images/can-you-make-a-minecraft-server-for-free_GM479516143.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_off00004bfc.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4BFC 24976 bytes
SHA-256: a16b7c1291b6c74cd63c45a54b7ebb6ccf8ef45fddb042091d4c893f892195b2
font_01_sfnt_off0000856f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x856F 18000 bytes
SHA-256: 6e064c38beceb31ff24ebe250b6be537090a6ec3e265cab0f175a96c42dfbe24

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