Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec4616284428a487…

MALICIOUS

PDF

33.9 KB Created: 2021-07-08 14:26:01 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-27
MD5: bf326c20a91c30c681008f1f3bf64080 SHA-1: e76f533a3e8622616c3365a2dbd24fa89f31de62 SHA-256: ec4616284428a48764e30062b155283d4d02f84997a0dbd65b653000dec23d01
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF document contains numerous links, including one pointing to a known malicious redirector infrastructure. The document body and heuristics indicate a lure for free game currency or hacks, likely leading to a phishing or malware download site. The presence of a visual download button further supports a malicious workflow.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 http://netcdn.tw/app/431946152/robux-free-robux-game-hack In PDF document text
    • http://www.stttekstil.ac.id/elib/repository/c00lkidd-roblox-how-to-get-his-hacks_GM431946152.pdfIn PDF document text
    • http://www.stttekstil.ac.id/elib/repository/roblox-parkour-hack-8-2021_GM431946152.pdfIn PDF document text
    • http://www.stttekstil.ac.id/elib/repository/how-do-i-get-free-robux-on-roblox_GM431946152.pdfIn PDF document text
    • http://www.stttekstil.ac.id/elib/repository/free-robux-without-downloading-anything_GM431946152.pdfIn PDF document text
    • http://www.stttekstil.ac.id/elib/repository/how-to-hack-on-roblox-2021_GM431946152.pdfIn PDF document text
    • http://www.stttekstil.ac.id/elib/repository/daily-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://www.stttekstil.ac.id/elib/repository/free-spin-coin-master-today_GM406889139.pdfIn PDF document text
    • http://www.stttekstil.ac.id/elib/repository/roblox-dance-your-blox-off-cheats-to-get-points_GM431946152.pdfIn PDF document text
    • http://www.stttekstil.ac.id/elib/repository/pubg-uc-jazz-cash_GM1330123889.pdfIn PDF document text
    • http://www.stttekstil.ac.id/elib/repository/free-roblox-accounts-2021-with-robux_GM431946152.pdfIn PDF document text
    • http://www.stttekstil.ac.id/elib/repository/hacks-for-boku-no-roblox-remastered_GM431946152.pdfIn PDF document text
    • http://www.stttekstil.ac.id/elib/repository/free-spin-coin-master-instagram_GM406889139.pdfIn PDF document text
    • http://www.stttekstil.ac.id/elib/repository/robux-code-redeem-free_GM431946152.pdfIn PDF document text
    • http://www.stttekstil.ac.id/elib/repository/roblox-attach-to-debugger-cheat-engine_GM431946152.pdfIn PDF document text
    • http://www.stttekstil.ac.id/elib/repository/how-do-you-get-free-robux-easy-way_GM431946152.pdfIn PDF document text
    • http://www.stttekstil.ac.id/elib/repository/coin-master-hack-no-survey-2021_GM406889139.pdfIn PDF document text
    • http://www.stttekstil.ac.id/elib/repository/coin-master-free-spin-link-today-16-11-2021_GM406889139.pdfIn PDF document text
    • http://www.stttekstil.ac.id/elib/repository/how-to-play-a-game-that-cost-robux-free_GM431946152.pdfIn PDF document text
    • http://www.stttekstil.ac.id/elib/repository/wurst-112-2_GM479516143.pdfIn PDF document text
    • http://www.stttekstil.ac.id/elib/repository/free-bobux_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
font_00_sfnt_off00002d44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2D44 22864 bytes
SHA-256: bf4f91b7c2b6f18a15612c23078a2d44bca36371bac51854e95d2a46afbe0c7a
font_01_sfnt_off00006098.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6098 18716 bytes
SHA-256: 776cb4e5338264d595c967a8fec9379201c9a4b17293b3c44edd5cf6cd499e31

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