Malicious PDF — malware analysis report

Static analysis result for SHA-256 523863eca1b28e73…

MALICIOUS

PDF

47.5 KB Created: 2020-08-19 12:42:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c8efd014179a3048a572bffddac9b396 SHA-1: 876095be3b2c1f2917338c860ce1c96c1afc8f3c SHA-256: 523863eca1b28e7388296603538b1653edb6f122c8973cad06fb351d9d1bd7af
152 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, with a critical heuristic firing indicating a link to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains text related to 'project timeline template ppt free' and the malicious URL, suggesting a lure. The presence of numerous external PDF links, many hosted on Shopify, further supports a link farm or redirection strategy. The ML classifier strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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.com/pify?keyword=project+timeline+template+ppt+free
    • http://files.stoneycreekvillas.net/uploads/1/3/0/8/130874582/3266412ba.pdf
    • http://files.dgbrothers.com/uploads/1/3/2/7/132740204/71f468855.pdf
    • http://files.peterclarkmd.com/uploads/1/3/2/6/132695401/1740700.pdf
    • https://cdn.shopify.com/s/files/1/0432/2331/8686/files/21766976861.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/84005007378.pdf
    • https://cdn.shopify.com/s/files/1/0431/1878/8774/files/27369305945.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/giratajolexodomofavewolov.pdf
    • https://cdn.shopify.com/s/files/1/0435/3572/8794/files/95267912726.pdf
    • https://cdn.shopify.com/s/files/1/0437/6553/0785/files/bryant_plus_90_furnace.pdf
    • https://cdn.shopify.com/s/files/1/0435/4693/5460/files/28191940618.pdf
    • https://cdn.shopify.com/s/files/1/0434/3624/5142/files/10903950757.pdf
    • https://cdn.shopify.com/s/files/1/0448/1715/4208/files/biology_download_class_12.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_off00007c9f.bin
8892391ef523a976d2e68ea86ee79cea6ed8e7474578916a20a52173b9a7a538
pdf-font-stream PDF embedded font (sfnt) at offset 0x7C9F 5060 bytes
font_01_sfnt_off00008dc4.bin
7bf44f5ed1083603616b12c348fbdc6a6259e88f42c9537778fe7da55a3702ee
pdf-font-stream PDF embedded font (sfnt) at offset 0x8DC4 10344 bytes