Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a2a99beedce991f…

MALICIOUS

PDF

41.5 KB Created: 2021-05-12 17:30:19 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 224b6d30a7ea8f6d3b9f70cbf2246594 SHA-1: aa8aad180305ee2b35abeb2532916fdf9f0b6926 SHA-256: 0a2a99beedce991f5ca2b43fcd672fcfd7a71c53b1a0d54ee2cfe07aeb3e4962
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-spins-and-coins-hack-game-hack PDF link annotation
    • http://yioipzafeiri.gr/images/how-to-get-free-robux-on-android_GM431946152.pdfIn PDF document text
    • http://yioipzafeiri.gr/images/free-private-minecraft-server_GM479516143.pdfIn PDF document text
    • http://yioipzafeiri.gr/images/coin-master-hack-pc-free_GM406889139.pdfIn PDF document text
    • http://yioipzafeiri.gr/images/free-spins-coin-master-links-twitter_GM406889139.pdfIn PDF document text
    • http://yioipzafeiri.gr/images/coin-master-hack-here_GM406889139.pdfIn PDF document text
    • http://yioipzafeiri.gr/images/free-robux-just-enter-username_GM431946152.pdfIn PDF document text
    • http://yioipzafeiri.gr/images/20-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://yioipzafeiri.gr/images/free-roblox-acc_GM431946152.pdfIn PDF document text
    • http://yioipzafeiri.gr/images/how-to-hack-roblox-accounts-2021_GM431946152.pdfIn PDF document text
    • http://yioipzafeiri.gr/images/coin-master-free-spins-2021_GM406889139.pdfIn PDF document text
    • http://yioipzafeiri.gr/images/coin-master-daily-free-spins-link-2021_GM406889139.pdfIn PDF document text
    • http://yioipzafeiri.gr/images/how-do-you-get-robux_GM431946152.pdfIn PDF document text
    • http://yioipzafeiri.gr/images/legit-coin-master-hack-without-verification_GM406889139.pdfIn PDF document text
    • http://yioipzafeiri.gr/images/how-to-hack-roblox-on-mobile_GM431946152.pdfIn PDF document text
    • http://yioipzafeiri.gr/images/minecraft-mod-updater_GM479516143.pdfIn PDF document text
    • http://yioipzafeiri.gr/images/best-free-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://yioipzafeiri.gr/images/coin-master-free-spins-link-today-blogspot_GM406889139.pdfIn PDF document text
    • http://yioipzafeiri.gr/images/free-spin-link-coin-master_GM406889139.pdfIn PDF document text
    • http://yioipzafeiri.gr/images/roblox-games-with-free-vip-servers_GM431946152.pdfIn PDF document text
    • http://yioipzafeiri.gr/images/haktuts-coin-master-free-daily-spins_GM406889139.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_off000048b1.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x48B1 24152 bytes
SHA-256: 89033dd335a9472b2fdfd9a2edd41dc2dbb33670e8acedef93b6f3925ee2f50c
font_01_sfnt_off00007ff7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7FF7 18228 bytes
SHA-256: 968d77e43c6b0b1c299d9da4b9fdaa5840c103d7fe58a67c77b67690964fdfdc

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