Malicious PDF — malware analysis report

Static analysis result for SHA-256 16adef203ddf67ab…

MALICIOUS

PDF

35.0 KB Created: 2021-07-06 08:36:28 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-25
MD5: bd58289f357044feaf3b2b2b9376a105 SHA-1: d66094c2fb560bb0e840a026ec6b2f98c8611d8a SHA-256: 16adef203ddf67abe4d7d0934ca4acc4e17be6961989e4f9ae363b6b5eca6dd1
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/how-to-generate-free-coin-master-spin-game-hack PDF link annotation
    • http://library.smpn2-byl.sch.id//repository/minecraft-bedrock-edition-download-pc-free_GM479516143.pdfIn PDF document text
    • http://library.smpn2-byl.sch.id//repository/coin-master-free-spin-ml_GM406889139.pdfIn PDF document text
    • http://library.smpn2-byl.sch.id//repository/free-robux-no-human-verification-2021_GM431946152.pdfIn PDF document text
    • http://library.smpn2-byl.sch.id//repository/coin-master-daily-free-spins-link-facebook_GM406889139.pdfIn PDF document text
    • http://library.smpn2-byl.sch.id//repository/free-spins-coin-master-blogspot_GM406889139.pdfIn PDF document text
    • http://library.smpn2-byl.sch.id//repository/roblox-scam_GM431946152.pdfIn PDF document text
    • http://library.smpn2-byl.sch.id//repository/pop-slots-free-vegas-casino-slots-machine-game-coin-master_GM406889139.pdfIn PDF document text
    • http://library.smpn2-byl.sch.id//repository/how-can-i-get-free-coinsn-coin-master_GM406889139.pdfIn PDF document text
    • http://library.smpn2-byl.sch.id//repository/free-robux-generator-without-verification_GM431946152.pdfIn PDF document text
    • http://library.smpn2-byl.sch.id//repository/free-robux-accounts_GM431946152.pdfIn PDF document text
    • http://library.smpn2-byl.sch.id//repository/hack-coin-master-android-game_GM406889139.pdfIn PDF document text
    • http://library.smpn2-byl.sch.id//repository/how-can-i-get-free-robux_GM431946152.pdfIn PDF document text
    • http://library.smpn2-byl.sch.id//repository/coin-master-free-spins-hack-ios_GM406889139.pdfIn PDF document text
    • http://library.smpn2-byl.sch.id/repository/roblox-free-play-no-download-or-sign-up_GM431946152.pdfIn PDF document text
    • http://library.smpn2-byl.sch.id//repository/roblox-prison-life-hack_GM431946152.pdfIn PDF document text
    • http://library.smpn2-byl.sch.id//repository/roblox-studio-free-robux_GM431946152.pdfIn PDF document text
    • http://library.smpn2-byl.sch.id//repository/free-spins-for-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://library.smpn2-byl.sch.id//repository/free-robux-no-survey-or-human-verification_GM431946152.pdfIn PDF document text
    • http://library.smpn2-byl.sch.id/repository/synaps-roblox-hack_GM431946152.pdfIn PDF document text
    • http://library.smpn2-byl.sch.id/repository/roblox-avatar-free-girl_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
font_00_sfnt_off0000336b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x336B 22772 bytes
SHA-256: 034aeceb75c74542fafc48224d4660896c4c1e4ccdf952a6dc628e4da177cab8
font_01_sfnt_off00006635.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6635 18336 bytes
SHA-256: 44149cbd1419f5cddd2185958f28928906a990b98f16256b2ecbc419de034d9f

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