Malicious PDF — malware analysis report

Static analysis result for SHA-256 819fc976eac93927…

MALICIOUS

PDF

46.1 KB Created: 2021-06-09 06:11:33 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-25
MD5: dafa801f11b44e45f8996cb97dbfbf58 SHA-1: 89dc93ed5590752f4fbb4122ffa545a5113e8132 SHA-256: 819fc976eac93927770126804e068e32e58d9a7ba4e2b9f6a9fc65cea29a2c92
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 0.9864

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/roblox-unlock-all-gamepass-free-pastebin-game-hack PDF link annotation
    • http://msfs-eastafrica.com/images/hack-coin-master-apk-32-download_GM406889139.pdfIn PDF document text
    • http://msfs-eastafrica.com/images/cheat-roblox-lumber-tycoon-2-btools_GM431946152.pdfIn PDF document text
    • http://msfs-eastafrica.com/images/coin-master-hack-online-generator-without-human-verification_GM406889139.pdfIn PDF document text
    • http://msfs-eastafrica.com/images/free-roblox-clothes-and-hair_GM431946152.pdfIn PDF document text
    • http://msfs-eastafrica.com/images/free-robux-no-verification-no-download-2021_GM431946152.pdfIn PDF document text
    • http://msfs-eastafrica.com/images/roblox-free-gift_GM431946152.pdfIn PDF document text
    • http://msfs-eastafrica.com/images/how-to-hack-coin-master-android_GM406889139.pdfIn PDF document text
    • http://msfs-eastafrica.com/images/coin-master-hack-app_GM406889139.pdfIn PDF document text
    • http://msfs-eastafrica.com/images/can-you-use-cheat-engine-on-roblox-2021_GM431946152.pdfIn PDF document text
    • http://msfs-eastafrica.com/images/free-robux-no-human-verification-generator_GM431946152.pdfIn PDF document text
    • http://msfs-eastafrica.com/images/coin-master-free-spin-and-coin_GM406889139.pdfIn PDF document text
    • http://msfs-eastafrica.com/images/coin-master-free-spins-apk-2021_GM406889139.pdfIn PDF document text
    • http://msfs-eastafrica.com/images/coin-master-hack-ios-cydia_GM406889139.pdfIn PDF document text
    • http://msfs-eastafrica.com/images/info-roblox-hack_GM431946152.pdfIn PDF document text
    • http://msfs-eastafrica.com/images/how-to-change-your-roblox-username-for-free-2021_GM431946152.pdfIn PDF document text
    • http://msfs-eastafrica.com/images/roblox-builders-club-free_GM431946152.pdfIn PDF document text
    • http://msfs-eastafrica.com/images/coin-master-free-spins-link-deutsch-ios_GM406889139.pdfIn PDF document text
    • http://msfs-eastafrica.com/images/how-to-get-free-coins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://msfs-eastafrica.com/images/how-to-hack-roblox-accounts-2021-april_GM431946152.pdfIn PDF document text
    • http://msfs-eastafrica.com/images/rblx-gg-free-robux_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_off00005164.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5164 27060 bytes
SHA-256: 752ab589cdb54b10d875bd7fd766d9a5208f9eeac0efb0d3fb597b31ed10920a
font_01_sfnt_off00008eeb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8EEB 19344 bytes
SHA-256: e2adeee205a7deda5f6c83fc85d19d2251300e6c444a199b2b03b298e745862b

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