Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab8133ae6ec79392…

MALICIOUS

PDF

42.8 KB Created: 2020-08-07 05:19:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a69c1cc4ed0a01a7f38f19717a211135 SHA-1: 5a2e2ba650c7440e27bddcb8d3dfba1bf0a1df7e SHA-256: ab8133ae6ec793920294b0934209bcc5ac5a48f6a2298beb580999346ab1f8d0
150 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded links, with one identified as a malicious redirector. The heuristic PDF_SEO_LINK_FARM indicates a link farm strategy, likely to distribute malicious content or phish users. The ML classifier also strongly flagged this PDF as malicious. The primary malicious IOC is the redirector URL.

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.ru/pify?keyword=pdf+file+resize+1+mb
    • http://files.abbi.ca/uploads/1/3/2/6/132681796/vevefakak.pdf
    • http://files.llaycommunitychurch.com/uploads/1/3/2/7/132712088/724f57967bfe2c.pdf
    • http://files.match-gems.com/uploads/1/3/2/7/132740598/913690.pdf
    • https://cdn.shopify.com/s/files/1/0428/2109/1484/files/telazireke.pdf
    • https://cdn.shopify.com/s/files/1/0437/3485/9941/files/32632539359.pdf
    • https://cdn.shopify.com/s/files/1/0439/2399/6840/files/5020582729.pdf
    • https://cdn.shopify.com/s/files/1/0431/8347/2802/files/wazunesigarubesu.pdf
    • https://cdn.shopify.com/s/files/1/0430/3077/3913/files/fitipaxumusabiwutebetov.pdf
    • https://cdn.shopify.com/s/files/1/0441/0490/8952/files/55432655179.pdf
    • https://cdn.shopify.com/s/files/1/0433/8096/5534/files/estadistica_descriptiva_spss.pdf
    • https://cdn.shopify.com/s/files/1/0431/7193/8461/files/5755377164.pdf
    • https://cdn.shopify.com/s/files/1/0433/3273/1038/files/fuwovutof.pdf
    • https://cdn.shopify.com/s/files/1/0435/4310/1591/files/pefekejedegimisu.pdf
    • https://cdn.shopify.com/s/files/1/0433/9856/1957/files/massimo_cacciari_libri.pdf
    • https://cdn.shopify.com/s/files/1/0430/9018/2304/files/29351566498.pdf
    • https://cdn.shopify.com/s/files/1/0431/5666/8573/files/dalapikitojiguwatin.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_off000069f6.bin
5a01d0c087abf50bdc945b8e5a720b5193473cfc7646355b2df2f8fa7d4b8bea		 pdf-font-stream PDF embedded font (sfnt) at offset 0x69F6 5084 bytes
font_01_sfnt_off00007b38.bin
a024b1ca5ef8374772359cd02449eb7881171113eb01f61cffd2b2a882e1f0d2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7B38 10616 bytes

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