Malicious PDF — malware analysis report

Static analysis result for SHA-256 189f637b401d7420…

MALICIOUS

PDF

51.9 KB Created: 2021-06-03 14:19:51 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-01
MD5: f5f7a1bab1bfdb2f1d5dbc2171ce8475 SHA-1: bbbd3c5e62643057494f1839eed553d780efec8b SHA-256: 189f637b401d7420a73b6c72b6af5d083cabd4e513ed91fd35621df33327bde3
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 0.9657

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.online/app/431946152/is-there-any-way-to-get-free-robux-game-hack PDF link annotation
    • http://library.patria-artha.ac.id/repository/coin-master-free-spin-daily-link_GM406889139.pdfIn PDF document text
    • http://library.patria-artha.ac.id/repository/free-minecraft-for-kids_GM479516143.pdfIn PDF document text
    • http://library.patria-artha.ac.id/repository/minecraft-net-download-free_GM479516143.pdfIn PDF document text
    • http://library.patria-artha.ac.id/repository/free-spins-for-coin-master-ios_GM406889139.pdfIn PDF document text
    • http://library.patria-artha.ac.id/repository/free-coin-link-for-coin-master_GM406889139.pdfIn PDF document text
    • http://library.patria-artha.ac.id/repository/how-to-hack-roblox-accounts-2021_GM431946152.pdfIn PDF document text
    • http://library.patria-artha.ac.id/repository/public-enemy-sun-prairie-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • http://library.patria-artha.ac.id/repository/minecraft-download-free-download_GM479516143.pdfIn PDF document text
    • http://library.patria-artha.ac.id/repository/free-robux-codes-no-verification-2021_GM431946152.pdfIn PDF document text
    • http://library.patria-artha.ac.id/repository/coin-master-free-spins-haktuts_GM406889139.pdfIn PDF document text
    • http://library.patria-artha.ac.id/repository/free-robux-quiz_GM431946152.pdfIn PDF document text
    • http://library.patria-artha.ac.id/repository/free-robux-hack-no-human-verification_GM431946152.pdfIn PDF document text
    • http://library.patria-artha.ac.id/repository/how-to-hack-people-in-roblox_GM431946152.pdfIn PDF document text
    • http://library.patria-artha.ac.id/repository/coin-master-free-spin-today_GM406889139.pdfIn PDF document text
    • http://library.patria-artha.ac.id/repository/coin-master-unlimited-spin-hack-apk_GM406889139.pdfIn PDF document text
    • http://library.patria-artha.ac.id/repository/free-robux-with-no-verification_GM431946152.pdfIn PDF document text
    • http://library.patria-artha.ac.id/repository/free-hacks-for-coin-master_GM406889139.pdfIn PDF document text
    • http://library.patria-artha.ac.id/repository/free-minecraft-realms-to-join_GM479516143.pdfIn PDF document text
    • http://library.patria-artha.ac.id/repository/pubg-uc-kaise-kamaye_GM1330123889.pdfIn PDF document text
    • http://library.patria-artha.ac.id/repository/como-hack-coin-master_GM406889139.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
stream_004_off00005140.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5140 25040 bytes
SHA-256: a6e78714caa1c6abdc8860baaab987eb1e00a84134527ac5a9260b8a705afb04
font_01_sfnt_off00008b0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8B0E 3400 bytes
SHA-256: 75c3a8e6f5c68e0746f893c922e57fd7e888a21fb038f9ae3eedb0a197a59e24
font_02_sfnt_off0000962d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x962D 6636 bytes
SHA-256: 62075f0fe13502d46afb6e55e83d440c29ef4988399537df1f86e7653ce3b744
font_03_sfnt_off0000a63a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA63A 18892 bytes
SHA-256: d4b621edf5ac5f073c5a65dd804db4f1f2ad13c123c1b5ace541ce5f5c284f58

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