Malicious PDF — malware analysis report

Static analysis result for SHA-256 392aae97731e0c4b…

MALICIOUS

PDF

34.7 KB Created: 2021-07-06 03:17:29 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 1a0108feb75dfb1bc7707ada4f69d1f3 SHA-1: 21fa437d6b4833899344028dfd0f320f5daf1b07 SHA-256: 392aae97731e0c4b3c1f4ff4a9adeb1afcc24002dcc201def55148400ebf82c2
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/coin-master-game-game-hack PDF link annotation
    • https://opac.umrah.ac.id/repository/how-to-use-cheats-on-roblox_GM431946152.pdfIn PDF document text
    • https://opac.umrah.ac.id/repository/roblox-phantom-forces-aimbot-free_GM431946152.pdfIn PDF document text
    • https://opac.umrah.ac.id/repository/multiplayer-master-hack-coins_GM406889139.pdfIn PDF document text
    • https://opac.umrah.ac.id/repository/coin-master-free-daily-spins-2021_GM406889139.pdfIn PDF document text
    • https://opac.umrah.ac.id/repository/free-spins-from-coin-master_GM406889139.pdfIn PDF document text
    • https://opac.umrah.ac.id/repository/free-roblox-accounts-2021_GM431946152.pdfIn PDF document text
    • https://opac.umrah.ac.id/repository/robux-free-2021_GM431946152.pdfIn PDF document text
    • https://opac.umrah.ac.id/repository/how-to-get-free-catalog-items-in-roblox_GM431946152.pdfIn PDF document text
    • https://opac.umrah.ac.id/repository/is-there-a-way-to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://opac.umrah.ac.id/repository/how-to-get-free-robux-for-real_GM431946152.pdfIn PDF document text
    • https://opac.umrah.ac.id/repository/free-robux-glitch_GM431946152.pdfIn PDF document text
    • https://opac.umrah.ac.id/repository/free-robux-no-verification-2021-android_GM431946152.pdfIn PDF document text
    • https://opac.umrah.ac.id/repository/lazy-blocks-com-free-robux_GM431946152.pdfIn PDF document text
    • https://opac.umrah.ac.id/repository/free-coin-master-cards_GM406889139.pdfIn PDF document text
    • https://opac.umrah.ac.id/repository/roblox-streets-hack_GM431946152.pdfIn PDF document text
    • https://opac.umrah.ac.id/repository/serena-ryder-wild-and-free-id-roblox-code_GM431946152.pdfIn PDF document text
    • https://opac.umrah.ac.id/repository/roblox-champl-dll-hack-download_GM431946152.pdfIn PDF document text
    • https://opac.umrah.ac.id/repository/how-to-hack-on-roblox-with-cheat-engine-64_GM431946152.pdfIn PDF document text
    • https://opac.umrah.ac.id/repository/free-roblox-cards-no-verification_GM431946152.pdfIn PDF document text
    • https://opac.umrah.ac.id/repository/how-to-get-free-items-on-roblox-2021-working_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_off0000313c.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x313C 23204 bytes
SHA-256: 65b6048ac09d51058d2b2e36f94a19896c9b85c4649028be0e051fc433271ff0
font_01_sfnt_off000065b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x65B6 18092 bytes
SHA-256: 5d2f08cdcdb2d82ae43a2e00a544b4e7341307674e8b6a95f7531c0e3d68a91d

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