Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf3e7759ebc72dca…

MALICIOUS

PDF

43.1 KB Created: 2021-05-14 20:39:24 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-23
MD5: fa5511eedfc59983f6a5daec572c435c SHA-1: 674a2dc32bd03466fe8a76b7bc2c79b2a1d3ae05 SHA-256: cf3e7759ebc72dcaff8c414cee74f7cba63805578ac431f050bda1c04e3201e1
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF document contains embedded links that redirect to malicious infrastructure, masquerading as a free game hack generator. The document body and heuristics indicate a lure for users to click these links, likely leading to further malware or phishing attempts. No scripts were extracted, but the presence of malicious redirector links and the ML classifier output strongly suggest malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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 https://netcdn.xyz/app/479516143/minecraft-java-edition-download-free-game-hack In PDF document text
    • https://schulzpressetext.de/images/robux-free-promo-codes_GM431946152.pdfIn PDF document text
    • https://schulzpressetext.de/images/how-to-get-robux-without-paying_GM431946152.pdfIn PDF document text
    • https://schulzpressetext.de/images/free-free-robux_GM431946152.pdfIn PDF document text
    • https://schulzpressetext.de/images/how-to-get-robux-for-free-2021_GM431946152.pdfIn PDF document text
    • https://schulzpressetext.de/images/master-free-spin-and-coin-links-html-m-1_GM406889139.pdfIn PDF document text
    • https://schulzpressetext.de/images/coin-master-daily-free-spins-link_GM406889139.pdfIn PDF document text
    • https://schulzpressetext.de/images/hack-coin-master-spin-android_GM406889139.pdfIn PDF document text
    • https://schulzpressetext.de/images/does-roblox-premium-expire_GM431946152.pdfIn PDF document text
    • https://schulzpressetext.de/images/free-robux-no-verify_GM431946152.pdfIn PDF document text
    • https://schulzpressetext.de/images/roblox-rape_GM431946152.pdfIn PDF document text
    • https://schulzpressetext.de/images/get-free-spins-on-coin-master-no-human-verification_GM406889139.pdfIn PDF document text
    • https://schulzpressetext.de/images/free-coin-master-account_GM406889139.pdfIn PDF document text
    • https://schulzpressetext.de/images/coin-master-free-cards_GM406889139.pdfIn PDF document text
    • https://schulzpressetext.de/images/roblox-army-robux_GM431946152.pdfIn PDF document text
    • https://schulzpressetext.de/images/how-to-earn-free-robux_GM431946152.pdfIn PDF document text
    • https://schulzpressetext.de/images/how-do-you-hack-roblox_GM431946152.pdfIn PDF document text
    • https://schulzpressetext.de/images/free-robux-gift-card-generator_GM431946152.pdfIn PDF document text
    • https://schulzpressetext.de/images/coin-master-facebook-hack_GM406889139.pdfIn PDF document text
    • https://schulzpressetext.de/images/free-robux-scam_GM431946152.pdfIn PDF document text
    • https://schulzpressetext.de/images/free-coin-master-coins-and-spins_GM406889139.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_003_off00004c79.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4C79 25108 bytes
SHA-256: d377e6160263ceef3b8ec34f27e92d12ed46d49159505c30b3700b9dd0924abe
font_01_sfnt_off0000851b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x851B 18572 bytes
SHA-256: b44bcce2d8515c0d099a66814c088ed689798a3dbc3c1364cf14b7c888151b67

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