Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c1f84e56db21de5…

MALICIOUS

PDF

34.9 KB Created: 2021-06-18 18:43:40 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-16
MD5: f1fd607def704881397ad5bd400bd034 SHA-1: e948a63c6df5d686a9424423ba05b4daf7d51296 SHA-256: 8c1f84e56db21de5799b071ed7e59d3151067d6a5d32c9446d1a12de05281b50
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous links disguised as game hacks and free currency generators, specifically targeting popular games like Roblox and Coin Master. These links lead to a known malicious redirector and a large number of SEO-optimized PDF files, indicating a link farm designed to drive traffic to potentially malicious sites. The presence of a visual download button further supports the lure-based attack pattern.

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.co/app/431946152/how-to-hack-prison-life-in-roblox-game-hack In PDF document text
    • http://katalog.ireyogya.org/repository/where-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://katalog.ireyogya.org/repository/how-to-get-free-robux-on-roblox-2021-no-hacks_GM431946152.pdfIn PDF document text
    • http://katalog.ireyogya.org/repository/how-do-you-get-free-robux-without-paying_GM431946152.pdfIn PDF document text
    • http://katalog.ireyogya.org/repository/free-money-in-mad-city-in-roblox-with-codes_GM431946152.pdfIn PDF document text
    • http://katalog.ireyogya.org/repository/free-robux-hack-no-human-verification_GM431946152.pdfIn PDF document text
    • http://katalog.ireyogya.org/repository/how-to-get-free-roblox-money_GM431946152.pdfIn PDF document text
    • http://katalog.ireyogya.org/repository/roblox-ingame-editor-hack_GM431946152.pdfIn PDF document text
    • http://katalog.ireyogya.org/repository/wwwcoin-master-hack-apk_GM406889139.pdfIn PDF document text
    • http://katalog.ireyogya.org/repository/daily-coin-master-free-spin-link_GM406889139.pdfIn PDF document text
    • http://katalog.ireyogya.org/repository/spin-link_GM406889139.pdfIn PDF document text
    • http://katalog.ireyogya.org/repository/coin-master-strategy_GM406889139.pdfIn PDF document text
    • http://katalog.ireyogya.org/repository/how-to-watch-ads-for-free-spins-in-coin-master_GM406889139.pdfIn PDF document text
    • http://katalog.ireyogya.org/repository/coin-master-free-spin-app-iphone_GM406889139.pdfIn PDF document text
    • http://katalog.ireyogya.org/repository/coin-master-fan-page-facebook_GM406889139.pdfIn PDF document text
    • http://katalog.ireyogya.org/repository/roblox-any-game-hack-download_GM431946152.pdfIn PDF document text
    • http://katalog.ireyogya.org/repository/free-robux-for-kids-that-can-hack-it_GM431946152.pdfIn PDF document text
    • http://katalog.ireyogya.org/repository/tiktok-free-views-website_GM835599320.pdfIn PDF document text
    • http://katalog.ireyogya.org/repository/how-to-make-your-game-really-popular-hack-on-roblox_GM431946152.pdfIn PDF document text
    • http://katalog.ireyogya.org/repository/earn-robux-today-for-free_GM431946152.pdfIn PDF document text
    • http://katalog.ireyogya.org/repository/free-100-robux_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_off00003117.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3117 22536 bytes
SHA-256: 998fac605d5467a15c06bca2cf9c4ac26349d13b09ee4ed23c34ef2ab889a22f
font_01_sfnt_off0000632d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x632D 19092 bytes
SHA-256: df2a52ad490175a0398264c918dea85179f75e5d67a240602b7f6e3a27daf538

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