Malicious PDF — malware analysis report

Static analysis result for SHA-256 790f1426e65bffca…

MALICIOUS

PDF

34.5 KB Created: 2021-07-04 11:02:07 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 7216e69ae81362352d87e70ace3797e0 SHA-1: 06b0bfc0e0fa10f68832e747a91a33ad04b2ab0f SHA-256: 790f1426e65bffcaef09fbe11075812dff41e61c0f9e06ee0d400ee51cbed223
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF document contains numerous external links, many of which point to a link farm hosted on digilib.ulm.ac.id, and one primary redirector at netcdn.tw. The content and structure strongly suggest a lure for game-related cheats or hacks, likely intended to drive traffic or distribute further malicious content. The ML classifier also flagged this PDF as malicious with high confidence.

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-for-coin-master-game-hack PDF link annotation
    • http://digilib.ulm.ac.id/pusat/repository/80-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://digilib.ulm.ac.id/pusat/repository/50-free-spins-coin-master-links_GM406889139.pdfIn PDF document text
    • http://digilib.ulm.ac.id/pusat/repository/coin-master-15-free-spin-link-of-last-5-days_GM406889139.pdfIn PDF document text
    • http://digilib.ulm.ac.id/pusat/repository/coin-master-daily-free-spins-blogspot_GM406889139.pdfIn PDF document text
    • http://digilib.ulm.ac.id/pusat/repository/how-to-make-a-t-shirt-in-roblox-for-free_GM431946152.pdfIn PDF document text
    • http://digilib.ulm.ac.id/pusat/repository/hack-para-tener-robux-en-roblox_GM431946152.pdfIn PDF document text
    • http://digilib.ulm.ac.id/pusat/repository/free-coin-master-cards_GM406889139.pdfIn PDF document text
    • http://digilib.ulm.ac.id/pusat/repository/how-to-make-t-shirts-on-roblox-free-sell_GM431946152.pdfIn PDF document text
    • http://digilib.ulm.ac.id/pusat/repository/pokemon-go-free-7-day-streak_GM1094591345.pdfIn PDF document text
    • http://digilib.ulm.ac.id/pusat/repository/coin-master-hack-club_GM406889139.pdfIn PDF document text
    • http://digilib.ulm.ac.id/pusat/repository/roblox-jailbreak-noob-vs-pro-vs-hacker_GM431946152.pdfIn PDF document text
    • http://digilib.ulm.ac.id/pusat/repository/roblox-robux-hack-2021-easy_GM431946152.pdfIn PDF document text
    • http://digilib.ulm.ac.id/pusat/repository/master-free-spin_GM406889139.pdfIn PDF document text
    • http://digilib.ulm.ac.id/pusat/repository/free-spin-coin-master-iphone_GM406889139.pdfIn PDF document text
    • http://digilib.ulm.ac.id/pusat/repository/free-robux-generator-no-human-verification-100_GM431946152.pdfIn PDF document text
    • http://digilib.ulm.ac.id/pusat/repository/roblox-sexually_GM431946152.pdfIn PDF document text
    • http://digilib.ulm.ac.id/pusat/repository/how-to-get-free-tiktok-followers_GM835599320.pdfIn PDF document text
    • http://digilib.ulm.ac.id/pusat/repository/robloxfun-com-generator_GM431946152.pdfIn PDF document text
    • http://digilib.ulm.ac.id/pusat/repository/roblox-cartoon-animation-free_GM431946152.pdfIn PDF document text
    • http://digilib.ulm.ac.id/pusat/repository/is-minecraft-free-on-switch_GM479516143.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_off00003345.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3345 22084 bytes
SHA-256: d82af4d2ef79134e5b4064d069d5efa0bc129ec26c5bb9648269bf3e360510b9
font_01_sfnt_off00006409.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6409 18348 bytes
SHA-256: c90f632020bcb1e728f62a43997badda2860e0d329262e99dedc1f8a12c39115

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