Malicious PDF — malware analysis report

Static analysis result for SHA-256 eaf2fe90874a61d2…

MALICIOUS

PDF

44.6 KB Created: 2021-06-03 05:51:19 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 5c6720c29859a6cff65b50a4dc657f62 SHA-1: 1789f63349f06afaa002bcbdab4f28ab2a0cb20c SHA-256: eaf2fe90874a61d2ac57156d04d48486d4422494c95d062b35d0cb3a7329f919
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 0.9865

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.online/app/406889139/coin-master-hack-xyz-apk-download-game-hack PDF link annotation
    • http://perpus.polbitrada.ac.id/repository/how-can-i-get-robux_GM431946152.pdfIn PDF document text
    • http://perpus.polbitrada.ac.id/repository/minecraft-for-laptop-free_GM479516143.pdfIn PDF document text
    • http://perpus.polbitrada.ac.id/repository/free-robux-discord_GM431946152.pdfIn PDF document text
    • http://perpus.polbitrada.ac.id/repository/bux-free-robux_GM431946152.pdfIn PDF document text
    • http://perpus.polbitrada.ac.id/repository/how-to-hack-a-roblox-account-2021_GM431946152.pdfIn PDF document text
    • http://perpus.polbitrada.ac.id/repository/free-spins-coin-master-blogspot_GM406889139.pdfIn PDF document text
    • http://perpus.polbitrada.ac.id/repository/coin-master-free-spins-apple_GM406889139.pdfIn PDF document text
    • http://perpus.polbitrada.ac.id/repository/free-robux-no-verification-no-survey_GM431946152.pdfIn PDF document text
    • http://perpus.polbitrada.ac.id/repository/free-spins-coin-master-no-verification_GM406889139.pdfIn PDF document text
    • http://perpus.polbitrada.ac.id/repository/roblox-free-robux-no-human-verification_GM431946152.pdfIn PDF document text
    • http://perpus.polbitrada.ac.id/repository/coin-master-hack-no-verification-2021_GM406889139.pdfIn PDF document text
    • http://perpus.polbitrada.ac.id/repository/free-roblox-characters_GM431946152.pdfIn PDF document text
    • http://perpus.polbitrada.ac.id/repository/roblox-free-item-codes_GM431946152.pdfIn PDF document text
    • http://perpus.polbitrada.ac.id/repository/boost9-com-roblox-hack_GM431946152.pdfIn PDF document text
    • http://perpus.polbitrada.ac.id/repository/moonactive-coin-master_GM406889139.pdfIn PDF document text
    • http://perpus.polbitrada.ac.id/repository/how-to-get-a-refund-on-roblox-2021_GM431946152.pdfIn PDF document text
    • http://perpus.polbitrada.ac.id/repository/free-spins-on-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://perpus.polbitrada.ac.id/repository/play-full-version-of-minecraft-for-free-no-download_GM479516143.pdfIn PDF document text
    • http://perpus.polbitrada.ac.id/repository/is-minecraft-free-on-pc_GM479516143.pdfIn PDF document text
    • http://perpus.polbitrada.ac.id/repository/is-roblox-free-on-ps4_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_off000051c0.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x51C0 24416 bytes
SHA-256: aefdf45af152cfbe7564b43b3c6792bced3f920520a24eaa6ee1ad208cfd395e
font_01_sfnt_off000089a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x89A3 18964 bytes
SHA-256: 42a942681b50248dcccc5fc85bca355d05b372000a3cb49c351c6f0dce64ffde

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