Malicious PDF — malware analysis report

Static analysis result for SHA-256 8af77008ebcf3f49…

MALICIOUS

PDF

44.6 KB Created: 2021-06-10 15:50:30 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 0a577cf4c400eee6c58be02ca1573c44 SHA-1: f7bb2120fbae5424687dce91c1ff7d5c12aba150 SHA-256: 8af77008ebcf3f49cf0f021d5ae26eaea71927b0405a9eb393c087b0a657ea11
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/free-robux-java-game-hack PDF link annotation
    • http://io24.com.ar/images/hack-minecraft_GM479516143.pdfIn PDF document text
    • http://io24.com.ar/images/hackear-el-roblox-med-city_GM431946152.pdfIn PDF document text
    • http://io24.com.ar/images/coin-master-heaven-free-spins-today_GM406889139.pdfIn PDF document text
    • http://io24.com.ar/images/how-to-have-free-robux-in-roblox_GM431946152.pdfIn PDF document text
    • http://io24.com.ar/images/coin-master-hack-version-download-2021_GM406889139.pdfIn PDF document text
    • http://io24.com.ar/images/skisploit-roblox-hack_GM431946152.pdfIn PDF document text
    • http://io24.com.ar/images/coin-master-hack-tool-no-survey_GM406889139.pdfIn PDF document text
    • http://io24.com.ar/images/pokeballs-in-pokemon-go-free_GM1094591345.pdfIn PDF document text
    • http://io24.com.ar/images/can-you-download-minecraft-for-free_GM479516143.pdfIn PDF document text
    • http://io24.com.ar/images/coin-master-hack-2021_GM406889139.pdfIn PDF document text
    • http://io24.com.ar/images/how-to-hack-roblox-accounts-with-cheat-engine-2021_GM431946152.pdfIn PDF document text
    • http://io24.com.ar/images/coin-master-spin-free_GM406889139.pdfIn PDF document text
    • http://io24.com.ar/images/free-spins-and-coins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://io24.com.ar/images/free-robux-hack-no-verification_GM431946152.pdfIn PDF document text
    • http://io24.com.ar/images/claim-free-robux_GM431946152.pdfIn PDF document text
    • http://io24.com.ar/images/coin-master-hack-download-ios_GM406889139.pdfIn PDF document text
    • http://io24.com.ar/images/mobihack-roblox-hack_GM431946152.pdfIn PDF document text
    • http://io24.com.ar/images/robux-fun-hack_GM431946152.pdfIn PDF document text
    • http://io24.com.ar/images/what-is-the-cheat-t-get-robux_GM431946152.pdfIn PDF document text
    • http://io24.com.ar/images/how-to-get-free-robux-2021-easy_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
stream_004_off00004f61.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4F61 25584 bytes
SHA-256: 883b025bab01ad6e0b42b85faae6413f947addeb4a61c8b84e58e1d19a5ed60a
font_01_sfnt_off00008adc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8ADC 18524 bytes
SHA-256: 0951888a4bc3f073a5ae71300572f12ed065ca2adc298e43a68512e77b46670e

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