Malicious PDF — malware analysis report

Static analysis result for SHA-256 81289f4acaa0da22…

MALICIOUS

PDF

35.4 KB Created: 2021-07-05 14:48:25 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-13
MD5: cecb8746064806377d6bef9bd2134035 SHA-1: 6a755e5dc6191ec31cf3fe1e7e216bafc8f6ed22 SHA-256: 81289f4acaa0da229dde5bbb4036b01258d8db2c220a0ced41195209a088eda9
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links that redirect to a known malicious domain, masquerading as a game hack generator. The document body and heuristics indicate a lure to a website offering 'free generators' or 'game hacks', which is a common social engineering tactic. The ML classifier also strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 4

  • 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.
  • 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 http://netcdn.tw/app/406889139/coin-master-play-online-free-game-hack In PDF document text
    • http://slims.abulyatama.ac.id/repository/free-robux-generator-for-roblox-2021_GM431946152.pdfIn PDF document text
    • http://slims.abulyatama.ac.id/repository/free-spins-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://slims.abulyatama.ac.id/repository/free-roblox-hack-scripts_GM431946152.pdfIn PDF document text
    • http://slims.abulyatama.ac.id/repository/roblox-strucid-hit-box-hack_GM431946152.pdfIn PDF document text
    • http://slims.abulyatama.ac.id/repository/how-to-get-free-robux-with-inspect-element-2021_GM431946152.pdfIn PDF document text
    • http://slims.abulyatama.ac.id/repository/roblox-magnet-simulator-hacks_GM431946152.pdfIn PDF document text
    • http://slims.abulyatama.ac.id//repository/mcpe-free-download_GM479516143.pdfIn PDF document text
    • http://slims.abulyatama.ac.id/repository/robux-com-free-robux_GM431946152.pdfIn PDF document text
    • http://slims.abulyatama.ac.id/repository/coin-master-free-spins-without-human-verification_GM406889139.pdfIn PDF document text
    • http://slims.abulyatama.ac.id/repository/gain-blox-2021-free-robux-inspect_GM431946152.pdfIn PDF document text
    • http://slims.abulyatama.ac.id/repository/how-to-use-cheat-engine-on-roblox-2021-67_GM431946152.pdfIn PDF document text
    • http://slims.abulyatama.ac.id/repository/i-want-robux_GM431946152.pdfIn PDF document text
    • http://slims.abulyatama.ac.id//repository/coin-master-free-spins-link-2021-today_GM406889139.pdfIn PDF document text
    • http://slims.abulyatama.ac.id//repository/20210-free-spin-links-for-coin-master_GM406889139.pdfIn PDF document text
    • http://slims.abulyatama.ac.id/repository/coin-master-hack-without-verification-ios_GM406889139.pdfIn PDF document text
    • http://slims.abulyatama.ac.id/repository/coin-master-hacks-for-spins_GM406889139.pdfIn PDF document text
    • http://slims.abulyatama.ac.id/repository/weird-roblox_GM431946152.pdfIn PDF document text
    • http://slims.abulyatama.ac.id/repository/free-robux-nl_GM431946152.pdfIn PDF document text
    • http://slims.abulyatama.ac.id/repository/how-to-hack-a-person-on-roblox-2021_GM431946152.pdfIn PDF document text
    • http://slims.abulyatama.ac.id/repository/roblox-free-drawing_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_002_off000031b8.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x31B8 23728 bytes
SHA-256: 46bdb9577d270683f83208438ea8f9ac67be53a5f978f9b53e00a600537abeec
font_01_sfnt_off000067a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x67A4 18408 bytes
SHA-256: 2eb0d828dfa855e50b6f487a3982aca0132c195de516b629f3de2a521e966112

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