Malicious PDF — malware analysis report

Static analysis result for SHA-256 5156ae1a853d65d8…

MALICIOUS

PDF

42.5 KB Created: 2021-05-14 05:31:10 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 618db273e451d9b25a93b34b5baa321d SHA-1: 2ee13f95d160ffc055a647c3d72d727bdbe4a873 SHA-256: 5156ae1a853d65d866b9b4cfc84a5f585e5f49208e422e03750a501720ef0fef
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links, many of which are related to game hacks and free in-game currency, indicating a lure for users. The heuristic 'PDF_SEO_LINK_FARM' suggests a large number of such links were embedded. The ML classifier also strongly flagged this PDF as malicious. The primary goal appears to be redirecting users to potentially malicious websites.

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/431946152/how-to-hack-roblox-accounts-2021-easy-game-hack PDF link annotation
    • https://xn--80adfcepoood1a3b.xn--p1ai/images/free-robux-just-enter-username_GM431946152.pdfIn PDF document text
    • https://xn--80adfcepoood1a3b.xn--p1ai/images/free-spins-on-coin-master-2021_GM406889139.pdfIn PDF document text
    • https://xn--80adfcepoood1a3b.xn--p1ai/images/real-roblox_GM431946152.pdfIn PDF document text
    • https://xn--80adfcepoood1a3b.xn--p1ai/images/coin-master-400-spin-link-hack_GM406889139.pdfIn PDF document text
    • https://xn--80adfcepoood1a3b.xn--p1ai/images/minecraft-ios-mods_GM479516143.pdfIn PDF document text
    • https://xn--80adfcepoood1a3b.xn--p1ai/images/coin-master-hack-programmers_GM406889139.pdfIn PDF document text
    • https://xn--80adfcepoood1a3b.xn--p1ai/images/coin-master-free-coins-and-spins-daily_GM406889139.pdfIn PDF document text
    • https://xn--80adfcepoood1a3b.xn--p1ai/images/coin-master-hack-spins-free_GM406889139.pdfIn PDF document text
    • https://xn--80adfcepoood1a3b.xn--p1ai/images/robux-page_GM431946152.pdfIn PDF document text
    • https://xn--80adfcepoood1a3b.xn--p1ai/images/get-free-robux-no-verification_GM431946152.pdfIn PDF document text
    • https://xn--80adfcepoood1a3b.xn--p1ai/images/coin-master-mod-free-download_GM406889139.pdfIn PDF document text
    • https://xn--80adfcepoood1a3b.xn--p1ai/images/free-pe_GM479516143.pdfIn PDF document text
    • https://xn--80adfcepoood1a3b.xn--p1ai/images/roblox-sexually_GM431946152.pdfIn PDF document text
    • https://xn--80adfcepoood1a3b.xn--p1ai/images/coin-master-free-spins-link-today-facebook_GM406889139.pdfIn PDF document text
    • https://xn--80adfcepoood1a3b.xn--p1ai/images/how-to-get-free-minecraft-alts_GM479516143.pdfIn PDF document text
    • https://xn--80adfcepoood1a3b.xn--p1ai/images/free-coin-master-spins-link_GM406889139.pdfIn PDF document text
    • https://xn--80adfcepoood1a3b.xn--p1ai/images/coin-master-free-food-for-pet_GM406889139.pdfIn PDF document text
    • https://xn--80adfcepoood1a3b.xn--p1ai/images/how-to-get-coin-master-free-spin-link_GM406889139.pdfIn PDF document text
    • https://xn--80adfcepoood1a3b.xn--p1ai/images/best-free-minecraft-hacked-client_GM479516143.pdfIn PDF document text
    • https://xn--80adfcepoood1a3b.xn--p1ai/images/all-coin-master-spin-link-and-free-download_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_off0000485d.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x485D 24904 bytes
SHA-256: a6b55ab4c1c1d17e0940b70b33d45e0990b569ae9640e9ae4d5af0463e3f84e8
font_01_sfnt_off000080ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x80AE 19172 bytes
SHA-256: 0a4c192dd0d49b475d670e2028b2e3d9bc88486e58824ff416e2d46c0acce708

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