Malicious PDF — malware analysis report

Static analysis result for SHA-256 42a71c892c2083fd…

MALICIOUS

PDF

45.0 KB Created: 2021-05-19 06:43:41 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-20
MD5: c52890b1ae47af242c37e298e1579f59 SHA-1: 42fb93140417b1cbd3cb81be740a67496c801010 SHA-256: 42a71c892c2083fd0509f68a4da10b2c8f123a874d6c2cc0abc66175bb0dfbac
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to websites offering game hacks and free in-game currency, indicating a lure for users to visit potentially malicious sites. The heuristic firings confirm the presence of malicious redirectors and a link farm, suggesting the primary goal is to drive traffic to these sites. While no scripts were explicitly extracted, the nature of the links and the ML classification strongly suggest a malicious intent to redirect users to exploit or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9632

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 https://netcdn.xyz/app/431946152/roblox-avatar-tester-game-hack In PDF document text
    • https://encounternepal.com/userfiles/files/earn-free-robux-on-roblox_GM431946152.pdfIn PDF document text
    • https://encounternepal.com/userfiles/files/how-to-hack-roblox-accounts-2021-easy_GM431946152.pdfIn PDF document text
    • https://encounternepal.com/userfiles/files/how-do-you-get-free-roebucks_GM431946152.pdfIn PDF document text
    • https://encounternepal.com/userfiles/files/make-robux_GM431946152.pdfIn PDF document text
    • https://encounternepal.com/userfiles/files/how-to-hack-minecraft_GM479516143.pdfIn PDF document text
    • https://encounternepal.com/userfiles/files/how-to-get-free-minecoins-in-minecraft_GM479516143.pdfIn PDF document text
    • https://encounternepal.com/userfiles/files/free-coin-and-spin-link_GM406889139.pdfIn PDF document text
    • https://encounternepal.com/userfiles/files/how-do-you-get-free-robux-without-doing-anything_GM431946152.pdfIn PDF document text
    • https://encounternepal.com/userfiles/files/free-robux-without-human-verification-2021_GM431946152.pdfIn PDF document text
    • https://encounternepal.com/userfiles/files/coin-master-free-spins-2021_GM406889139.pdfIn PDF document text
    • https://encounternepal.com/userfiles/files/coin-master-free-coins-amp_GM406889139.pdfIn PDF document text
    • https://encounternepal.com/userfiles/files/public-enemy-sun-prairie-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • https://encounternepal.com/userfiles/files/coin-master-daily-free-spins-and-coins_GM406889139.pdfIn PDF document text
    • https://encounternepal.com/userfiles/files/minecraft-texture-packs-free-download_GM479516143.pdfIn PDF document text
    • https://encounternepal.com/userfiles/files/free-coin-master-coins-2021_GM406889139.pdfIn PDF document text
    • https://encounternepal.com/userfiles/files/free-minecraft-java-code_GM479516143.pdfIn PDF document text
    • https://encounternepal.com/userfiles/files/coin-master-free-spins-and-coins-blogspot_GM406889139.pdfIn PDF document text
    • https://encounternepal.com/userfiles/files/como-hackear-coin-master_GM406889139.pdfIn PDF document text
    • https://encounternepal.com/userfiles/files/roblox-free-login_GM431946152.pdfIn PDF document text
    • https://encounternepal.com/userfiles/files/coin-master-daily-free-spins-and-coins-2021_GM406889139.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004892.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4892 24356 bytes
SHA-256: 8743b58ef9b6f430a371fd25e93bec98cb76e76ac89b3fec0d0142ffe59382c1
font_01_sfnt_off0000809b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x809B 3884 bytes
SHA-256: 40b61f8938bd710dc29dc58ba3fde91c245a6a69596ec569b4d27c769ca417cf
font_02_sfnt_off00008d43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8D43 18228 bytes
SHA-256: 202894cb6a5bec519cb1aff7aa26487a29ece32a0cf0ce5d4249a64a0c567dc3

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