Malicious PDF — malware analysis report

Static analysis result for SHA-256 27c8340626369566…

MALICIOUS

PDF

33.1 KB Created: 2021-06-25 15:32:32 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-08-25
MD5: bf7326ff66fb86cff606dcbb8f32c725 SHA-1: a42f38ea4b28f9bf9a041186c6b91e1b8db97633 SHA-256: 27c834062636956691e7285ec63751bdc788f27493afc7fc5188bb976043e7a6
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links designed to lure users into clicking on what appear to be game-related hacks or generators. One primary URL, http://netcdn.co/app/431946152/roblox-catalog-free-robux-game-hack, is identified as a malicious redirector. The document body and heuristics suggest a scam or phishing attempt, likely leading to further malicious content or malware download. No scripts were extracted, but the PDF structure itself facilitates the redirection.

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/roblox-catalog-free-robux-game-hack In PDF document text
    • http://www.shivintech.com/uploaded_files/userfiles/files/minecraft-pe-free-ios_GM479516143.pdfIn PDF document text
    • http://www.shivintech.com/uploaded_files/userfiles/files/coin-master-free-attack-link_GM406889139.pdfIn PDF document text
    • http://www.shivintech.com/uploaded_files/userfiles/files/free-robux-codes-generator-no-verification_GM431946152.pdfIn PDF document text
    • http://www.shivintech.com/uploaded_files/userfiles/files/free-spins-coin-master-links-2021_GM406889139.pdfIn PDF document text
    • http://www.shivintech.com/uploaded_files/userfiles/files/free-robux-roblox-promo-codes_GM431946152.pdfIn PDF document text
    • http://www.shivintech.com/uploaded_files/userfiles/files/free-robux-generator-com-roblox-hack_GM431946152.pdfIn PDF document text
    • http://www.shivintech.com/uploaded_files/userfiles/files/www-robux_GM431946152.pdfIn PDF document text
    • http://www.shivintech.com/uploaded_files/userfiles/files/how-to-start-a-minecraft-server-for-free_GM479516143.pdfIn PDF document text
    • http://www.shivintech.com/uploaded_files/userfiles/files/free-coins-and-spins-in-coin-master_GM406889139.pdfIn PDF document text
    • http://www.shivintech.com/uploaded_files/userfiles/files/sites-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://www.shivintech.com/uploaded_files/userfiles/files/minecraft-free-download-apk-softonic_GM479516143.pdfIn PDF document text
    • http://www.shivintech.com/uploaded_files/userfiles/files/how-to-get-real-robux_GM431946152.pdfIn PDF document text
    • http://www.shivintech.com/uploaded_files/userfiles/files/50-000-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://www.shivintech.com/uploaded_files/userfiles/files/free-roblox-hack-us_GM431946152.pdfIn PDF document text
    • http://www.shivintech.com/uploaded_files/userfiles/files/official-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • http://www.shivintech.com/uploaded_files/userfiles/files/free-robux-now_GM431946152.pdfIn PDF document text
    • http://www.shivintech.com/uploaded_files/userfiles/files/minecraft-free-version_GM479516143.pdfIn PDF document text
    • http://www.shivintech.com/uploaded_files/userfiles/files/free-minecraft-videos_GM479516143.pdfIn PDF document text
    • http://www.shivintech.com/uploaded_files/userfiles/files/can-u-hack-roblox-with-lucky-patcher_GM431946152.pdfIn PDF document text
    • http://www.shivintech.com/uploaded_files/userfiles/files/free-roblox-website_GM431946152.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
font_00_sfnt_off00002e41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2E41 21200 bytes
SHA-256: 4946915b9a051224ef3e0230c2c220a976cce4b6cb949102b31ce492674f169b
font_01_sfnt_off00005c5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5C5F 18928 bytes
SHA-256: 63c32a30dbfa74d95b945d758946f97b5de950fcfde935a4964c3c61d4c8156f