Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8ffa9823f34a531…

MALICIOUS

PDF

45.0 KB Created: 2021-06-10 14:02:29 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-31
MD5: f478b2ff129cba95d0215d46354da500 SHA-1: 86c75a9c583361c23c19dca83d7920bc1d3ca60d SHA-256: c8ffa9823f34a531166f8d7d97eaa7e757a01f65e83b1f5eb7d04a579644e262
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document employs a lure of game hacks and generators to trick users into clicking malicious links. It contains numerous links to redirectors and a link farm, suggesting an attempt to drive traffic to potentially harmful sites. The document body, though partially corrupted, contains URLs that align with the heuristic findings of malicious redirectors and SEO link farms.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9865

Heuristics 5

  • PDF links to a 'free generator / game hack' redirector critical 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. CRITICAL on its own: the /app/<id>/<slug>-game-hack path shape is unambiguous scam infra, and the host rotates so a host-list match can't be relied on.
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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
  • 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/how-to-cheat-engine-roblox-game-hack In PDF document text
    • http://muslib.unmus.ac.id/repository/get-roebucks-com_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id//repository/free-spins-for-coin-master-game_GM406889139.pdfIn PDF document text
    • http://muslib.unmus.ac.id//repository/se-puede-hackear-coin-master_GM406889139.pdfIn PDF document text
    • http://muslib.unmus.ac.id//repository/free-minecraft-generator_GM479516143.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/minecraft-fly-hack_GM479516143.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/how-to-get-free-money-on-roblox-high-school-2_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/easy-coin-master-hack-without-verification_GM406889139.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/coin-master-hack-apk-android_GM406889139.pdfIn PDF document text
    • http://muslib.unmus.ac.id//repository/free-spins-in-coin-master-without-human-verification_GM406889139.pdfIn PDF document text
    • http://muslib.unmus.ac.id//repository/claim-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/how-to-start-a-minecraft-server-for-free_GM479516143.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/free-spins-coin-master-2021-hack_GM406889139.pdfIn PDF document text
    • http://muslib.unmus.ac.id//repository/how-to-get-free-robux-app_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/what-is-coin-master-app_GM406889139.pdfIn PDF document text
    • http://muslib.unmus.ac.id//repository/hack-coin-master-using-pc_GM406889139.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/how-to-hack-in-roblox-prison-life_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/how-to-get-free-cards-for-coin-master_GM406889139.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/free-roblox-money_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id//repository/free-roblox-scripts_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/can-i-download-minecraft-for-free_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
stream_004_off000050ac.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x50AC 25384 bytes
SHA-256: 8eaf989529d2917546a15973c63992a30728d602d671b9be2585ecd59e90ecb3
font_01_sfnt_off00008b7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8B7B 18856 bytes
SHA-256: a27a203a512a89f86f1c7112b77cd48c9355457bd074675a26f7f93942bd737d

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