Malicious PDF — malware analysis report

Static analysis result for SHA-256 066627d6ef31eb51…

MALICIOUS

PDF

50.4 KB Created: 2021-05-13 03:56:50 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 2089e62ce6039861adb0b938fb521d4b SHA-1: 6af850c2c5f8fab72c1849984b52fc30776329bd SHA-256: 066627d6ef31eb51ba43f74333e0287a1f83d6443100a170ba2ae1fd43c4c988
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 0.8594

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/robux-only-game-hack PDF link annotation
    • https://www.mjcorporatemall.com/uploaded_files/userfiles/files/coin-master-links-free-spins_GM406889139.pdfIn PDF document text
    • https://www.mjcorporatemall.com/uploaded_files/userfiles/files/coin-master-hacked-apk-download-for-android_GM406889139.pdfIn PDF document text
    • https://www.mjcorporatemall.com/uploaded_files/userfiles/files/coin-master-free-spin-and-coin-link-haktuts-hacking-news_GM406889139.pdfIn PDF document text
    • https://www.mjcorporatemall.com/uploaded_files/userfiles/files/free-robux-codes-no-human-verification_GM431946152.pdfIn PDF document text
    • https://www.mjcorporatemall.com/uploaded_files/userfiles/files/free-spins-for-coin-master-ios_GM406889139.pdfIn PDF document text
    • https://www.mjcorporatemall.com/uploaded_files/userfiles/files/how-do-you-get-free-roblox-money_GM431946152.pdfIn PDF document text
    • https://www.mjcorporatemall.com/uploaded_files/userfiles/files/earn-robux-now_GM431946152.pdfIn PDF document text
    • https://www.mjcorporatemall.com/uploaded_files/userfiles/files/coinmaster-free-cards_GM406889139.pdfIn PDF document text
    • https://www.mjcorporatemall.com/uploaded_files/userfiles/files/free-coin-master-spins-2021_GM406889139.pdfIn PDF document text
    • https://www.mjcorporatemall.com/uploaded_files/userfiles/files/free-mod-apk-coin-master_GM406889139.pdfIn PDF document text
    • https://www.mjcorporatemall.com/uploaded_files/userfiles/files/coin-master-hack-version-33-2_GM406889139.pdfIn PDF document text
    • https://www.mjcorporatemall.com/uploaded_files/userfiles/files/does-coin-master-hack-work_GM406889139.pdfIn PDF document text
    • https://www.mjcorporatemall.com/uploaded_files/userfiles/files/25-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • https://www.mjcorporatemall.com/uploaded_files/userfiles/files/minecraft-building-hacks_GM479516143.pdfIn PDF document text
    • https://www.mjcorporatemall.com/uploaded_files/userfiles/files/free-links-for-coin-master_GM406889139.pdfIn PDF document text
    • https://www.mjcorporatemall.com/uploaded_files/userfiles/files/roblox-2021-hack_GM431946152.pdfIn PDF document text
    • https://www.mjcorporatemall.com/uploaded_files/userfiles/files/free-robux-gift-card-codes-2021_GM431946152.pdfIn PDF document text
    • https://www.mjcorporatemall.com/uploaded_files/userfiles/files/free-roblox-injector_GM431946152.pdfIn PDF document text
    • https://www.mjcorporatemall.com/uploaded_files/userfiles/files/coin-master-free-spins-hack-apk-download_GM406889139.pdfIn PDF document text
    • https://www.mjcorporatemall.com/uploaded_files/userfiles/files/how-to-get-free-robux-on-roblox_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004bbd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4BBD 28172 bytes
SHA-256: d6431460273acf48c7b57698d4212aea863b3a6947f9e2a5734bd50d329eac84
font_01_sfnt_off00008b67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8B67 2976 bytes
SHA-256: f01acc160ef1393137cd7a90315dbabef2de3b2672caff7b486b43975190684a
font_02_sfnt_off000095a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x95A0 5696 bytes
SHA-256: 450e3ee45915afe13702bf1d587eb8b9ad88a8d2113419ac9f2fd116a828e139
font_03_sfnt_off0000a2b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA2B2 18104 bytes
SHA-256: 835647ca3f0bcc9c34df60568ac9a35acac0655e7da8ad66dbd525e7cff734af