Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d086455c7537c20…

MALICIOUS

PDF

42.8 KB Created: 2021-05-11 23:03:45 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 8c83c39d6512bf65718e9060e222bc60 SHA-1: 244812e098813f096fcd1ae2e1ea9c3e455d8d45 SHA-256: 5d086455c7537c206b170bb5c9e89cda7a868cdfc2eeb767dca9e9a79219191f
160 Risk Score

Malware Insights

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

The PDF document contains a lure for a 'free generator / game hack' which redirects to malicious infrastructure. The primary link identified, https://netcdn.xyz/app/431946152/how-to-change-your-username-in-roblox-for-free-game-hack, is associated with known malicious redirectors. The document body, though partially corrupted, contains text related to game hacks and the malicious URL, reinforcing the lure.

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/431946152/how-to-change-your-username-in-roblox-for-free-game-hack In PDF document text
    • http://techmobil.pl/images/free-robux-gen_GM431946152.pdfIn PDF document text
    • http://techmobil.pl/images/how-to-get-free-robux-2021-no-human-verification_GM431946152.pdfIn PDF document text
    • http://techmobil.pl/images/coin-master-free-spins-daily-2021_GM406889139.pdfIn PDF document text
    • http://techmobil.pl/images/www-free-robux_GM431946152.pdfIn PDF document text
    • http://techmobil.pl/images/hack-coin-master-apk-2021_GM406889139.pdfIn PDF document text
    • http://techmobil.pl/images/coin-master-how-to-get-free-pet-food_GM406889139.pdfIn PDF document text
    • http://techmobil.pl/images/coin-master-free-spin-today_GM406889139.pdfIn PDF document text
    • http://techmobil.pl/images/free-spin-appscoin-master_GM406889139.pdfIn PDF document text
    • http://techmobil.pl/images/hack-coin-master-1_GM406889139.pdfIn PDF document text
    • http://techmobil.pl/images/robux-free-gift-card-org-hack_GM431946152.pdfIn PDF document text
    • http://techmobil.pl/images/how-to-make-a-server-in-minecraft-java-for-free_GM479516143.pdfIn PDF document text
    • http://techmobil.pl/images/free-spins-from-coin-master_GM406889139.pdfIn PDF document text
    • http://techmobil.pl/images/coin-master-play-online-free_GM406889139.pdfIn PDF document text
    • http://techmobil.pl/images/roblox-april-fools-hack_GM431946152.pdfIn PDF document text
    • http://techmobil.pl/images/apps-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://techmobil.pl/images/coin-master-gold-cards-free_GM406889139.pdfIn PDF document text
    • http://techmobil.pl/images/how-to-get-free-robux-app_GM431946152.pdfIn PDF document text
    • http://techmobil.pl/images/how-to-get-free-robux-fast_GM431946152.pdfIn PDF document text
    • http://techmobil.pl/images/how-to-hack-coin-master-ios-2021_GM406889139.pdfIn PDF document text
    • http://techmobil.pl/images/how-to-get-free-spins-on-coin-master-2021-ios_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_off000048f7.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x48F7 24936 bytes
SHA-256: 28b3631fade5d43f1be315e21a84406c2810d25a5943f3f364b3b4bae920242c
font_01_sfnt_off0000817d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x817D 19540 bytes
SHA-256: 47934da0ee3f947cf015c12c60a39e8e7f45bd5e58593390266dea94dc2cb6c6

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