Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e28415c97e4a427…

MALICIOUS

PDF

46.4 KB Created: 2021-06-09 10:08:53 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 40dfe9eae0336bf4d606e7329198a9d2 SHA-1: 58bce0baab93ae59d23ed672b2623874b25449f8 SHA-256: 4e28415c97e4a4274541b1a848317e540def6a5270c673915effe4d735050ff5
142 Risk Score

Malware Insights

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

This PDF document contains numerous links to websites offering game cheats and free in-game currency, such as Robux and Coin Master spins. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of such links, suggesting a malicious intent to redirect users to potentially harmful sites. The ML classifier also flagged this PDF with high confidence. While no scripts were explicitly extracted, the nature of the lures and the presence of external URIs strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9832

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.tw/app/431946152/cheats-for-money-on-roblox-for-bloxburg-game-hack PDF link annotation
    • https://unsla.uns.ac.id:443/pgsd/repository/free-robux-promo-codes-2021_GM431946152.pdfIn PDF document text
    • https://unsla.uns.ac.id:443/pgsd/repository/how-to-get-free-robux-on-a-website_GM431946152.pdfIn PDF document text
    • https://unsla.uns.ac.id:443/pgsd/repository/how-to-get-free-robux-on-mobile_GM431946152.pdfIn PDF document text
    • https://unsla.uns.ac.id:443/pgsd/repository/free-robux-gift-card-codes_GM431946152.pdfIn PDF document text
    • https://unsla.uns.ac.id:443/pgsd/repository/today-free-spin-coin-master_GM406889139.pdfIn PDF document text
    • https://unsla.uns.ac.id:443/pgsd/repository/minecraft-bedrock-hacks_GM479516143.pdfIn PDF document text
    • https://unsla.uns.ac.id:443/pgsd/repository/i-need-more-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • https://unsla.uns.ac.id:443/pgsd/repository/how-to-get-free-robux-on-phone_GM431946152.pdfIn PDF document text
    • https://unsla.uns.ac.id:443/pgsd/repository/robux-matchcomfree-robux_GM431946152.pdfIn PDF document text
    • https://unsla.uns.ac.id:443/pgsd/repository/wwwcoin-master-hack-apk_GM406889139.pdfIn PDF document text
    • https://unsla.uns.ac.id:443/pgsd/repository/i-want-free-robux_GM431946152.pdfIn PDF document text
    • https://unsla.uns.ac.id:443/pgsd/repository/how-to-install-minecraft-for-free_GM479516143.pdfIn PDF document text
    • https://unsla.uns.ac.id:443/pgsd/repository/free-robux-app_GM431946152.pdfIn PDF document text
    • https://unsla.uns.ac.id:443/pgsd/repository/roblox-free-robux-no-verification_GM431946152.pdfIn PDF document text
    • https://unsla.uns.ac.id:443/pgsd/repository/hack-pokemon-go-free-coins_GM1094591345.pdfIn PDF document text
    • https://unsla.uns.ac.id:443/pgsd/repository/free-robux-by-watching-ads_GM431946152.pdfIn PDF document text
    • https://unsla.uns.ac.id:443/pgsd/repository/how-to-get-free-robux-app_GM431946152.pdfIn PDF document text
    • https://unsla.uns.ac.id:443/pgsd/repository/claim-gg-free-robux-promo-codes_GM431946152.pdfIn PDF document text
    • https://unsla.uns.ac.id:443/pgsd/repository/coin-master-stop-attack-hack_GM406889139.pdfIn PDF document text
    • https://unsla.uns.ac.id:443/pgsd/repository/free-spins-for-coin-master_GM406889139.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_004_off00005238.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5238 26852 bytes
SHA-256: 2bb19c8277612543d74bac005d7abbbb47ab564f91ed50a59094ddd50956233c
font_01_sfnt_off00008ff0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8FF0 19252 bytes
SHA-256: b3101caac132e4d240af95325137a6622120727dc976cd2978e10b4669fe681e

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