Malicious PDF — malware analysis report

Static analysis result for SHA-256 efc22ec5bdbda56d…

MALICIOUS

PDF

35.4 KB Created: 2021-07-05 10:37:30 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-01
MD5: fbd0471049ce16efec5e5b4ce5830ca2 SHA-1: 41da6c7ead108bb28f2e6233575e184b00d90a34 SHA-256: efc22ec5bdbda56d252400243b2da250c80496ef42e2a1ae200a9ee7e39c2251
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/406889139/the-coin-master-hack-game-hack PDF link annotation
    • https://slims.bakrie.ac.id/textbook/repository/how-to-escape-prison-life-roblox-hack_GM431946152.pdfIn PDF document text
    • https://slims.bakrie.ac.id/textbook/repository/free-minecraft-java-edition-codes_GM479516143.pdfIn PDF document text
    • https://slims.bakrie.ac.id/textbook/repository/fast-robux-online_GM431946152.pdfIn PDF document text
    • https://slims.bakrie.ac.id/textbook/repository/how-to-get-free-clothes-on-roblox-without-creating_GM431946152.pdfIn PDF document text
    • https://slims.bakrie.ac.id/textbook/repository/how-to-scam-on-roblox_GM431946152.pdfIn PDF document text
    • https://slims.bakrie.ac.id/textbook/repository/are-there-any-roblox-games-that-have-a-free-radio_GM431946152.pdfIn PDF document text
    • https://slims.bakrie.ac.id/textbook/repository/how-to-hack-into-someones-roblox-account_GM431946152.pdfIn PDF document text
    • https://slims.bakrie.ac.id/textbook/repository/how-to-get-1-million-robux-without-hacking_GM431946152.pdfIn PDF document text
    • https://slims.bakrie.ac.id/textbook/repository/minecraft-hacks-pc_GM479516143.pdfIn PDF document text
    • https://slims.bakrie.ac.id/textbook/repository/real-coin-master-hack_GM406889139.pdfIn PDF document text
    • https://slims.bakrie.ac.id/textbook/repository/coin-master-free-spin-codes_GM406889139.pdfIn PDF document text
    • https://slims.bakrie.ac.id/textbook/repository/coin-master-for-pc-free-download_GM406889139.pdfIn PDF document text
    • https://slims.bakrie.ac.id/textbook/repository/free-promo-codes-for-roblox-2021_GM431946152.pdfIn PDF document text
    • https://slims.bakrie.ac.id/textbook/repository/how-to-get-robux-for-free-2021_GM431946152.pdfIn PDF document text
    • https://slims.bakrie.ac.id/textbook/repository/roblox-hacked-com-2021_GM431946152.pdfIn PDF document text
    • https://slims.bakrie.ac.id/textbook/repository/coin-master-hack-online-link_GM406889139.pdfIn PDF document text
    • https://slims.bakrie.ac.id/textbook/repository/how-to-hack-a-pin-code-in-roblox_GM431946152.pdfIn PDF document text
    • https://slims.bakrie.ac.id/textbook/repository/robux-hack-fr_GM431946152.pdfIn PDF document text
    • https://slims.bakrie.ac.id/textbook/repository/coin-master-free-cards-link-2021_GM406889139.pdfIn PDF document text
    • https://slims.bakrie.ac.id/textbook/repository/billionaires-headphones-free-roblox_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_002_off0000347a.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x347A 23076 bytes
SHA-256: 3acfc3d96748571253c7a4c5a59128e5b4df9bd4073b70746780fc741e62ff35
font_01_sfnt_off00006839.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6839 18172 bytes
SHA-256: f57f56fa31c3d175a3f1fa0851054e19c40acc708c3dd6ae86a2d8887aa1904d

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