Malicious PDF — malware analysis report

Static analysis result for SHA-256 f657b1dcaf1931be…

MALICIOUS

PDF

34.4 KB Created: 2021-07-03 22:28:37 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: c8053cb20496479633cee9ec73ee3e9d SHA-1: e13b20ce3c4a069765948929b98875ffc55df25f SHA-256: f657b1dcaf1931befabb92afcd1b901bcdb812728dbc3ac1ea334a7b15cda64a
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/free-coins-and-spins-coin-master-game-hack PDF link annotation
    • https://www.myeresults.ng/ci/userfiles/files/free-links-for-coin-master_GM406889139.pdfIn PDF document text
    • https://www.myeresults.ng/ci/userfiles/files/free-coins-and-spins-coin-master-2021_GM406889139.pdfIn PDF document text
    • https://www.myeresults.ng/ci/userfiles/files/free-google-play-promo-codes-coin-master_GM406889139.pdfIn PDF document text
    • https://www.myeresults.ng/ci/userfiles/files/roblox-prison-life-swat-gear-free_GM431946152.pdfIn PDF document text
    • https://www.myeresults.ng/ci/userfiles/files/how-to-hack-in-roblox-hoops_GM431946152.pdfIn PDF document text
    • https://www.myeresults.ng/ci/userfiles/files/coin-master-hack-tool-exe_GM406889139.pdfIn PDF document text
    • https://www.myeresults.ng/ci/userfiles/files/how-to-get-hacks-for-roblox-jailbreak_GM431946152.pdfIn PDF document text
    • https://www.myeresults.ng/ci/userfiles/files/how-to-get-free-robux-glitch-easy_GM431946152.pdfIn PDF document text
    • https://www.myeresults.ng/ci/userfiles/files/cheat-codes-for-roblox-dragon-ball-rage_GM431946152.pdfIn PDF document text
    • https://www.myeresults.ng/ci/userfiles/files/hacking-a-roblox-fans_GM431946152.pdfIn PDF document text
    • https://www.myeresults.ng/ci/userfiles/files/coin-master-hack-ios-2021_GM406889139.pdfIn PDF document text
    • https://www.myeresults.ng/ci/userfiles/files/hilton-hotels-roblox-hack_GM431946152.pdfIn PDF document text
    • https://www.myeresults.ng/ci/userfiles/files/coin-master-free-spins-2021_GM406889139.pdfIn PDF document text
    • https://www.myeresults.ng/ci/userfiles/files/roblox-free-neck-accessories_GM431946152.pdfIn PDF document text
    • https://www.myeresults.ng/ci/userfiles/files/how-to-get-free-robux-without-verifying_GM431946152.pdfIn PDF document text
    • https://www.myeresults.ng/ci/userfiles/files/roblox-arsenal-hack_GM431946152.pdfIn PDF document text
    • https://www.myeresults.ng/ci/userfiles/files/actual-free-robux-no-human-verification-no-offers_GM431946152.pdfIn PDF document text
    • https://www.myeresults.ng/ci/userfiles/files/robux-no-human-verification_GM431946152.pdfIn PDF document text
    • https://www.myeresults.ng/ci/userfiles/files/robux-hack-com_GM431946152.pdfIn PDF document text
    • https://www.myeresults.ng/ci/userfiles/files/robloxwin-earn-free-robux_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_off00002f94.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x2F94 23040 bytes
SHA-256: e7987c163cef74f98883011c3f0d7adfd0e051edf203e071aaf56c0447ced312
font_01_sfnt_off000063a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x63A1 18348 bytes
SHA-256: c90f632020bcb1e728f62a43997badda2860e0d329262e99dedc1f8a12c39115

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