Malicious PDF — malware analysis report

Static analysis result for SHA-256 168337dffebb1dc7…

MALICIOUS

PDF

35.3 KB Created: 2021-06-20 17:21:19 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-25
MD5: fd3a2368c01986bb7872c8cc13f00d56 SHA-1: 1a4cbd1cb62c98467e02827b378465d618bee7a8 SHA-256: 168337dffebb1dc750a5c0772eefeab488773727bb161bf6e00fd05dd4dc70d4
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 0.9980

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 http://netcdn.co/app/431946152/someone-hacked-my-account-roblox-how-to-get-robux-back-game-hack PDF link annotation
    • http://pia2000.net/images/how-to-cheat-on-any-roblox-game_GM431946152.pdfIn PDF document text
    • http://pia2000.net/images/roblox-free-download-apk-android_GM431946152.pdfIn PDF document text
    • http://pia2000.net/images/ihacker-space-de-remove-space-free-robux-obc-2021_GM431946152.pdfIn PDF document text
    • http://pia2000.net/images/minecraft-coins-free_GM479516143.pdfIn PDF document text
    • http://pia2000.net/images/coin-master-card-collection-hack-2021_GM406889139.pdfIn PDF document text
    • http://pia2000.net/images/coin-master-free-spins-1701-20_GM406889139.pdfIn PDF document text
    • http://pia2000.net/images/wahoo-free-robux_GM431946152.pdfIn PDF document text
    • http://pia2000.net/images/free-robux-with-no-verification_GM431946152.pdfIn PDF document text
    • http://pia2000.net/images/how-to-gett-free-robux_GM431946152.pdfIn PDF document text
    • http://pia2000.net/images/how-to-get-free-spins-on-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://pia2000.net/images/how-to-make-a-group-on-roblox-for-free_GM431946152.pdfIn PDF document text
    • http://pia2000.net/images/free-robux-generator-no-human-verification-2021_GM431946152.pdfIn PDF document text
    • http://pia2000.net/images/coin-master-links-for-today_GM406889139.pdfIn PDF document text
    • http://pia2000.net/images/hacker-net-roblox_GM431946152.pdfIn PDF document text
    • http://pia2000.net/images/counter-blox-roblox-hack-script_GM431946152.pdfIn PDF document text
    • http://pia2000.net/images/robux-converter_GM431946152.pdfIn PDF document text
    • http://pia2000.net/images/coin-master-gold-cards-hack-2021_GM406889139.pdfIn PDF document text
    • http://pia2000.net/images/free-minecraft-hacks_GM479516143.pdfIn PDF document text
    • http://pia2000.net/images/get-a-free-roblox-account_GM431946152.pdfIn PDF document text
    • http://pia2000.net/images/hack-coin-master-game-apk-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
font_00_sfnt_off00002f90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2F90 22676 bytes
SHA-256: 2e7e6bbeeef1586c23128fbbd012d7afb4904bf3904d80da7b0d0a57f501a383
font_01_sfnt_off00006277.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6277 19872 bytes
SHA-256: ee5b06e8de414119ff238f566767092bdd8946153d98e1527af964d2b024a2b6

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