Malicious PDF — malware analysis report

Static analysis result for SHA-256 c98763d62dbf70ef…

MALICIOUS

PDF

47.6 KB Created: 2021-06-03 20:03:56 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 6ac01cdf30d794109d07ac654863fd11 SHA-1: d225766f5bfe86a5ff20a28bf9fedfb3be9a53e5 SHA-256: c98763d62dbf70efbfdc901ac78e004f69c99a5eae8cf640b41cb27881b4ee3a
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 0.9769

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/406889139/free-coin-spin-daily-link-coin-master-game-hack PDF link annotation
    • https://e-learning.mtsn5sumedang.sch.id/__statics/gudangsoal/files/coin-master-hacks-and-cheats_GM406889139.pdfIn PDF document text
    • https://e-learning.mtsn5sumedang.sch.id/__statics/gudangsoal/files/free-robux-generator-2021-no-survey_GM431946152.pdfIn PDF document text
    • https://e-learning.mtsn5sumedang.sch.id/__statics/gudangsoal/files/cmaster-club-coin-master-hack-tool_GM406889139.pdfIn PDF document text
    • https://e-learning.mtsn5sumedang.sch.id/__statics/gudangsoal/files/coin-master-hack-app-ios_GM406889139.pdfIn PDF document text
    • https://e-learning.mtsn5sumedang.sch.id/__statics/gudangsoal/files/free-robux-no-human-verification-generator_GM431946152.pdfIn PDF document text
    • https://e-learning.mtsn5sumedang.sch.id/__statics/gudangsoal/files/coin-master-daily-free-spins-link-today-2021_GM406889139.pdfIn PDF document text
    • https://e-learning.mtsn5sumedang.sch.id/__statics/gudangsoal/files/can-you-actually-get-free-robux_GM431946152.pdfIn PDF document text
    • https://e-learning.mtsn5sumedang.sch.id/__statics/gudangsoal/files/coin-master-free-spins-promo-code_GM406889139.pdfIn PDF document text
    • https://e-learning.mtsn5sumedang.sch.id/__statics/gudangsoal/files/how-to-hack-roblox-to-get-robux_GM431946152.pdfIn PDF document text
    • https://e-learning.mtsn5sumedang.sch.id/__statics/gudangsoal/files/roblox-free-followers_GM431946152.pdfIn PDF document text
    • https://e-learning.mtsn5sumedang.sch.id/__statics/gudangsoal/files/static-moonactive-net-link_GM406889139.pdfIn PDF document text
    • https://e-learning.mtsn5sumedang.sch.id/__statics/gudangsoal/files/coin-master-free-cards-link-2021_GM406889139.pdfIn PDF document text
    • https://e-learning.mtsn5sumedang.sch.id/__statics/gudangsoal/files/pokemon-go-free-remote-raid-pass_GM1094591345.pdfIn PDF document text
    • https://e-learning.mtsn5sumedang.sch.id/__statics/gudangsoal/files/free-robux-human-verification_GM431946152.pdfIn PDF document text
    • https://e-learning.mtsn5sumedang.sch.id/__statics/gudangsoal/files/how-to-get-free-hair-on-roblox-2021_GM431946152.pdfIn PDF document text
    • https://e-learning.mtsn5sumedang.sch.id/__statics/gudangsoal/files/how-do-u-get-free-robux_GM431946152.pdfIn PDF document text
    • https://e-learning.mtsn5sumedang.sch.id/__statics/gudangsoal/files/free-robux-roblox-promo-codes_GM431946152.pdfIn PDF document text
    • https://e-learning.mtsn5sumedang.sch.id/__statics/gudangsoal/files/coin-master-hack-link-2021_GM406889139.pdfIn PDF document text
    • https://e-learning.mtsn5sumedang.sch.id/__statics/gudangsoal/files/mangocheats-com-hack-coin-master-cheat_GM406889139.pdfIn PDF document text
    • https://e-learning.mtsn5sumedang.sch.id/__statics/gudangsoal/files/free-robux-for-kids_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00005342.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5342 25548 bytes
SHA-256: b6b20546dabef2ef1abf9f32d75f1b9cafda6de51da9acc2ec6663afae210216
font_01_sfnt_off00008cd8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8CD8 2840 bytes
SHA-256: 3fb127b764b9d10f5525bc4de5ec8316de704409ccb0cf21cff3ad8a30d11676
font_02_sfnt_off0000968a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x968A 18476 bytes
SHA-256: 9d60a2e782eeb8051ddff45576a6e1a66ba7dfa86d66828505d8c060f58b239a

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