Malicious PDF — malware analysis report

Static analysis result for SHA-256 f181cc9b9cc5bba7…

MALICIOUS

PDF

34.8 KB Created: 2021-07-04 20:41:25 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 4e8410f5f71c377ba5161e63f9ee3cd8 SHA-1: 1a3a6b51ac2603599a439d5e5f33c48a48b51907 SHA-256: f181cc9b9cc5bba78cf80f04e2b291bf8bd801628de45934a35f8688defae989
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.tw/app/431946152/roblox-free-admin-gear-codes-game-hack PDF link annotation
    • https://digilib.stimlog.ac.id/repository/play-minecraft-pocket-edition-for-free_GM479516143.pdfIn PDF document text
    • http://digilib.stimlog.ac.id/repository/coin-master-free-spins-link-blogspot-today_GM406889139.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/free-roblox-cards-no-survey_GM431946152.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/free-roblox-gift-card-codes_GM431946152.pdfIn PDF document text
    • http://digilib.stimlog.ac.id/repository/free-robux-no-anti-bot-verification_GM431946152.pdfIn PDF document text
    • http://digilib.stimlog.ac.id/repository/coin-master-mod-apk_GM406889139.pdfIn PDF document text
    • http://digilib.stimlog.ac.id/repository/is-tiktok-free_GM835599320.pdfIn PDF document text
    • http://digilib.stimlog.ac.id/repository/roblox-free-play-online-login_GM431946152.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/how-to-make-a-free-server-in-minecraft-java_GM479516143.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/how-to-play-minecraft-with-friends-for-free_GM479516143.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/coin-master-blogspot-links_GM406889139.pdfIn PDF document text
    • http://digilib.stimlog.ac.id/repository/how-to-get-free-robux-com_GM431946152.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/roblox-kick-off-hacks_GM431946152.pdfIn PDF document text
    • http://digilib.stimlog.ac.id/repository/can-you-download-minecraft-for-free_GM479516143.pdfIn PDF document text
    • http://digilib.stimlog.ac.id/repository/spins-for-coin-master_GM406889139.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/how-to-hack-coin-master-without-root_GM406889139.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/toradora-roblox-roblox-t-schirts-free_GM431946152.pdfIn PDF document text
    • http://digilib.stimlog.ac.id/repository/how-to-get-100-robux-on-roblox-free-2021_GM431946152.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/roblox-cs-go-hack-nasl-yaplr_GM431946152.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/roblox-pokemon-cheats_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
font_00_sfnt_off00002e7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2E7F 23200 bytes
SHA-256: bbc13f1d26658ab21268bb117e6342b10482f654160611e8f84b470d148f94ac
font_01_sfnt_off00006292.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6292 19204 bytes
SHA-256: fd309300ca10f7d2532d5775434e8212e60a97ee72cb7d9ba48ae398bfe72829

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