Malicious PDF — malware analysis report

Static analysis result for SHA-256 c58f1dd3e4e5d0a9…

MALICIOUS

PDF

53.0 KB Created: 2020-07-25 22:16:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: abfb753a5aa7b21fe24ca61939195e52 SHA-1: fb693da77616fd8dfc030288389afc15902a85cb SHA-256: c58f1dd3e4e5d0a9b39a49e038021069f471b6b2e6eb75f103c7721328f3dc27
150 Risk Score

Malware Insights

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

The PDF was flagged for containing a malicious redirector link and a large number of external PDF links, suggesting a link farm or SEO poisoning attack. The ML classifier also strongly indicated maliciousness. The primary malicious IOC is the redirector URL, which likely leads to further malicious content or phishing pages. The document body is heavily obfuscated and contains metadata indicating it was generated by wkhtmltopdf.

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.com/pify?keyword=adithya+tv+comedy
    • http://files.thomasbalazs.com/uploads/1/3/1/4/131438366/b2f7c892f65.pdf
    • http://files.safehand.org/uploads/1/3/0/7/130775292/715f747bda4b96c.pdf
    • http://files.hemingfordharvestmoonfallfestival.com/uploads/1/3/0/8/130813025/7935615.pdf
    • http://files.thomasbalazs.com/up
    • https://cdn.shopify.com/s/files/1/0431/4556/0220/files/radirobilepejeda.pdf
    • https://cdn.shopify.com/s/files/1/0434/4479/7600/files/wobimipibip.pdf
    • https://cdn.shopify.com/s/files/1/0435/4726/3131/files/8362733709.pdf
    • https://cdn.shopify.com/s/files/1/0430/0016/8597/files/55384190130.pdf
    • https://cdn.shopify.com/s/files/1/0433/5593/0783/files/7664683219.pdf
    • https://cdn.shopify.com/s/files/1/0428/2171/4076/files/44174068601.pdf
    • https://cdn.shopify.com/s/files/1/0432/2492/4319/files/94685537673.pdf
    • https://cdn.shopify.com/s/files/1/0434/1245/5591/files/gefewowawoje.pdf
    • https://cdn.shopify.com/s/files/1/0428/8082/7558/files/64029549209.pdf
    • https://cdn.shopify.com/s/files/1/0435/7003/6904/files/46488134846.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00008543.bin
8a7247eef5d9479e224680ca865f52ccd7b76fc4cff51b96729514a171951ef9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8543 4708 bytes
font_01_sfnt_off00009549.bin
c802282a8740837c93e7f69d156f9c5b8301daf4913ef454a430f27eb8a9074e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9549 4848 bytes
font_02_sfnt_off0000a50b.bin
da4d1e34f4effa80a52e39417ac2671b78ca7b143e0af43fecdad5dc19c3e8cd		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA50B 9980 bytes

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