Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3cee5cf950cb184…

MALICIOUS

PDF

35.2 KB Created: 2021-07-05 10:58:05 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-01
MD5: 491c1fed1f48eeddd4e4e077a00f6161 SHA-1: 051926d9e3007f0ddbd3b1d0a67bf05e15266509 SHA-256: a3cee5cf950cb184717263ff3ad7b730fa3bf274455dc3174dd57a6e60e403ef
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/cheats-coin-master-free-game-hack PDF link annotation
    • http://library.stieyapan.ac.id//repository/hack-coin-master-android_GM406889139.pdfIn PDF document text
    • http://library.stieyapan.ac.id//repository/tiktok-free-hearts-hack_GM835599320.pdfIn PDF document text
    • http://library.stieyapan.ac.id//repository/my-minecraft-account-was-hacked_GM479516143.pdfIn PDF document text
    • http://library.stieyapan.ac.id/repository/how-to-make-robux_GM431946152.pdfIn PDF document text
    • http://library.stieyapan.ac.id//repository/blogspot-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • http://library.stieyapan.ac.id/repository/how-to-hack-someones-roblox-account-2021_GM431946152.pdfIn PDF document text
    • http://library.stieyapan.ac.id/repository/roblox-free-vip-server-ro-ghoul_GM431946152.pdfIn PDF document text
    • http://library.stieyapan.ac.id/repository/how-to-hack-somebodys-roblox_GM431946152.pdfIn PDF document text
    • http://library.stieyapan.ac.id//repository/free-minecraft-codes-2021_GM479516143.pdfIn PDF document text
    • http://library.stieyapan.ac.id/repository/get-robux-free-and-legit_GM431946152.pdfIn PDF document text
    • http://library.stieyapan.ac.id/repository/coin-master-free-gold-cards-link_GM406889139.pdfIn PDF document text
    • http://library.stieyapan.ac.id/repository/is-there-any-way-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://library.stieyapan.ac.id/repository/how-to-download-minecraft-hacks_GM479516143.pdfIn PDF document text
    • http://library.stieyapan.ac.id/repository/coin-master-free-coins-app_GM406889139.pdfIn PDF document text
    • http://library.stieyapan.ac.id/repository/coin-master-hack-online-no-human-verification_GM406889139.pdfIn PDF document text
    • http://library.stieyapan.ac.id/repository/rainbow-orange-roblox-free_GM431946152.pdfIn PDF document text
    • http://library.stieyapan.ac.id/repository/games-like-coin-master_GM406889139.pdfIn PDF document text
    • http://library.stieyapan.ac.id//repository/easy-ways-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://library.stieyapan.ac.id/repository/coin-master-free-spin-links-december-30-2021_GM406889139.pdfIn PDF document text
    • http://library.stieyapan.ac.id/repository/how-to-hack-into-someones-roblox-account_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_off000033ab.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x33AB 23108 bytes
SHA-256: 998d1215ace728c819250cc38860a91b2fb54deb93b6bd0c5eca1ac5b12aacf9
font_01_sfnt_off00006791.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6791 18164 bytes
SHA-256: 633654536bcea0a488290fcd779b8b9be9e6d5b85a28b0965e2a3ef2168f9803

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