Malicious PDF — malware analysis report

Static analysis result for SHA-256 82bf8b5dd2d4ef44…

MALICIOUS

PDF

50.9 KB Created: 2020-07-30 06:04:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b53ce90fcd000956cf70e20a2b73276f SHA-1: ac720df77216be0a3c1ecf69dd46d870f22c0bbe SHA-256: 82bf8b5dd2d4ef447b64f4d2f07e34696ab5253782f29d27042b3263bbd79b08
150 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF file was flagged as malicious due to the presence of a link to a known malicious redirector. This redirector likely serves as a gateway to a phishing or malware distribution site. The document body, though heavily obfuscated, contains text related to 'viral and bacterial infection' and mentions 'wkhtmltopdf', suggesting a lure to trick users into downloading or viewing malicious content. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • 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.
  • 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://ttraff.cc/pify?keyword=diferen%25C3%25A7a+infec%25C3%25A7%25C3%25A3o+viral+e+bacteriana+pdf
    • http://files.mchsorchestra.com/uploads/1/3/1/6/131607110/4029818.pdf
    • http://files.lauravallesconsulting.com/uploads/1/3/0/7/130776162/moguzemadur-vezozo.pdf
    • http://files.rominaberenicecanet.com/uploads/1/3/0/8/130874241/916995.pdf
    • http://files.eugeneatwoodfund.org/uploads/1/3/1/6/131637679/dewegiv-wizarozife-dukuwibupelari.pdf
    • http://files.backcountryclassroom.net/uploads/1/3/2/6/132682989/nelinizupa.pdf
    • http://files.eugeneatwoodfund.org/uploads/1/3/1/6/131637679/dewegiv-wizarozife-dukuw
    • https://cdn.shopify.com/s/files/1/0430/5004/1495/files/duwifuwitaxik.pdf
    • https://cdn.shopify.com/s/files/1/0429/1392/3228/files/zalijezepupikux.pdf
    • https://cdn.shopify.com/s/files/1/0437/7686/8504/files/vivakofexonapemalukepav.pdf
    • https://cdn.shopify.com/s/files/1/0431/5525/9560/files/27092690165.pdf
    • https://cdn.shopify.com/s/files/1/0436/9914/2810/files/46324679331.pdf
    • https://cdn.shopify.com/s/files/1/0432/7456/7843/files/89180441786.pdf
    • https://cdn.shopify.com/s/files/1/0433/1434/8197/files/poxesomolenosexazamov.pdf
    • https://cdn.shopify.com/s/files/1/0437/6598/9530/files/25655398717.pdf
    • https://cdn.shopify.com/s/files/1/0429/6884/2393/files/90112731850.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007955.bin
c1e4443e36176a365a06f724d6f3f9cc7034bd87defc267cc13c2e1a3d82355c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7955 5456 bytes
font_01_sfnt_off00008b11.bin
c2f1d2c3eae11143b8f6a7a28615113781b1c51676f5b0b895cb6bc2174e0ddb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8B11 17292 bytes

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