Malicious PDF — malware analysis report

Static analysis result for SHA-256 b92f0e548ccf92b6…

MALICIOUS

PDF

43.1 KB Created: 2021-05-14 16:57:21 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 316c067196a518d7f4c3afb481929cf2 SHA-1: 2266521d8c6e9c0eea2762d2650c5e544c2f49d4 SHA-256: b92f0e548ccf92b6d0a689dc9cfbb2fb65bd653f9f5eefe476bcdcd0ccd044a1
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-snacks-link-game-hack PDF link annotation
    • https://elearning.mtsguppicileungsir.sch.id/__statics/gudangsoal/files/coin-blogspot_GM406889139.pdfIn PDF document text
    • https://elearning.mtsguppicileungsir.sch.id/__statics/gudangsoal/files/minecraft-hack-download_GM479516143.pdfIn PDF document text
    • https://elearning.mtsguppicileungsir.sch.id/__statics/gudangsoal/files/free-spins-and-coins-coin-master-2021-link_GM406889139.pdfIn PDF document text
    • https://elearning.mtsguppicileungsir.sch.id/__statics/gudangsoal/files/minecraft-windows-10-free-with-java_GM479516143.pdfIn PDF document text
    • https://elearning.mtsguppicileungsir.sch.id/__statics/gudangsoal/files/how-to-get-hacks-on-roblox_GM431946152.pdfIn PDF document text
    • https://elearning.mtsguppicileungsir.sch.id/__statics/gudangsoal/files/roblox-april-fools-hack_GM431946152.pdfIn PDF document text
    • https://elearning.mtsguppicileungsir.sch.id/__statics/gudangsoal/files/games-like-coin-master-for-free_GM406889139.pdfIn PDF document text
    • https://elearning.mtsguppicileungsir.sch.id/__statics/gudangsoal/files/coin-master-hack-android-no-root_GM406889139.pdfIn PDF document text
    • https://elearning.mtsguppicileungsir.sch.id/__statics/gudangsoal/files/roblox-free-robux-no-human-verification_GM431946152.pdfIn PDF document text
    • https://elearning.mtsguppicileungsir.sch.id/__statics/gudangsoal/files/coin-master-free-spins-link-2021-download_GM406889139.pdfIn PDF document text
    • https://elearning.mtsguppicileungsir.sch.id/__statics/gudangsoal/files/how-do-u-get-free-robux-2021_GM431946152.pdfIn PDF document text
    • https://elearning.mtsguppicileungsir.sch.id/__statics/gudangsoal/files/coin-master-links-for-free-spins-2021_GM406889139.pdfIn PDF document text
    • https://elearning.mtsguppicileungsir.sch.id/__statics/gudangsoal/files/free-coins-and-spins-coin-master-2021_GM406889139.pdfIn PDF document text
    • https://elearning.mtsguppicileungsir.sch.id/__statics/gudangsoal/files/coin-master-hack-without-human-verification-2021_GM406889139.pdfIn PDF document text
    • https://elearning.mtsguppicileungsir.sch.id/__statics/gudangsoal/files/free-roblox-dominus_GM431946152.pdfIn PDF document text
    • https://elearning.mtsguppicileungsir.sch.id/__statics/gudangsoal/files/get-free-robux-2021_GM431946152.pdfIn PDF document text
    • https://elearning.mtsguppicileungsir.sch.id/__statics/gudangsoal/files/roblox-account-taker_GM431946152.pdfIn PDF document text
    • https://elearning.mtsguppicileungsir.sch.id/__statics/gudangsoal/files/coin-master-free-spins-link-2021-today_GM406889139.pdfIn PDF document text
    • https://elearning.mtsguppicileungsir.sch.id/__statics/gudangsoal/files/how-to-get-free-robux-without-doing-anything_GM431946152.pdfIn PDF document text
    • https://elearning.mtsguppicileungsir.sch.id/__statics/gudangsoal/files/roblox-redeem-codes-free_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_003_off00004d6f.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4D6F 25132 bytes
SHA-256: 9d75c100a17f6ab4c22230d33d3c6c85684a0df015e9ae383e30baee063f2c96
font_01_sfnt_off0000873e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x873E 17880 bytes
SHA-256: 09034ee7a1f9989932e9db65c2957a4d9f61d6fccc52a1ac5f57be2128ce07e5

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