Malicious PDF — malware analysis report

Static analysis result for SHA-256 777a4a4c7228b4a4…

MALICIOUS

PDF

47.9 KB Created: 2021-06-04 02:41:37 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 74a8d208ceaa037b60e3315fdf443c63 SHA-1: 10821d389c881ae5732ce04af65e01e7184f87dd SHA-256: 777a4a4c7228b4a456f96cd5cdcd97ead19c12c7e3178ed9e3d2858f7f4ba784
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 0.9796

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/479516143/game-toolbox-game-hack PDF link annotation
    • https://opac.umrah.ac.id/repository/coin-master-hack-app-download-free_GM406889139.pdfIn PDF document text
    • https://opac.umrah.ac.id/repository/best-roblox-hacks_GM431946152.pdfIn PDF document text
    • https://opac.umrah.ac.id/repository/free-robux-games-on-roblox_GM431946152.pdfIn PDF document text
    • https://opac.umrah.ac.id/repository/grabpoints-robux_GM431946152.pdfIn PDF document text
    • https://opac.umrah.ac.id/repository/robux-generator-no-verification-needed_GM431946152.pdfIn PDF document text
    • https://opac.umrah.ac.id/repository/hacks-for-coin-master-game_GM406889139.pdfIn PDF document text
    • https://opac.umrah.ac.id/repository/pubg-uc-vn_GM1330123889.pdfIn PDF document text
    • https://opac.umrah.ac.id/repository/how-to-make-a-private-server-on-roblox-for-free_GM431946152.pdfIn PDF document text
    • https://opac.umrah.ac.id/repository/roblox-play-now-for-free_GM431946152.pdfIn PDF document text
    • https://opac.umrah.ac.id/repository/20-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • https://opac.umrah.ac.id/repository/free-roblox-accounts-2021-with-robux_GM431946152.pdfIn PDF document text
    • https://opac.umrah.ac.id/repository/minecraft-java-edition-code-free_GM479516143.pdfIn PDF document text
    • https://opac.umrah.ac.id/repository/coin-master-fan-page-giveaway_GM406889139.pdfIn PDF document text
    • https://opac.umrah.ac.id/repository/coin-master-hack-fast-org_GM406889139.pdfIn PDF document text
    • https://opac.umrah.ac.id/repository/how-to-get-free-spins-on-coin-master-facebook_GM406889139.pdfIn PDF document text
    • https://opac.umrah.ac.id/repository/free-spins-coin-master-october-17-2021_GM406889139.pdfIn PDF document text
    • https://opac.umrah.ac.id/repository/minecraft-anarchy-server-no-hacks_GM479516143.pdfIn PDF document text
    • https://opac.umrah.ac.id/repository/roblox-cheat-codes_GM431946152.pdfIn PDF document text
    • https://opac.umrah.ac.id/repository/get-free-robux-2021_GM431946152.pdfIn PDF document text
    • https://opac.umrah.ac.id/repository/i-cant-get-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off000055e1.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x55E1 25432 bytes
SHA-256: 1652fcdfc45d0085a373bf049817c04d27859817d6799d87bb3e1b67470dbb25
font_01_sfnt_off00008f62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8F62 2820 bytes
SHA-256: 34dd21cbcbbf8680f9624d5ddfa25e49232e6768200f74ddacb5347fd7a5f6dc
font_02_sfnt_off00009903.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9903 18188 bytes
SHA-256: cc5ae47c5e11d0f88656729761c41b71782f27a7f5283d48097ca54d7cfe7015

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