Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae04d68c56bc6122…

MALICIOUS

PDF

47.2 KB Created: 2020-08-12 17:08:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 05b3b0cbf8e610c7d2c9a764cd5bff28 SHA-1: 4bfe61b78e75ece4f4aee3cd3c26ae26d762e35a SHA-256: ae04d68c56bc6122b3a3f9e027cc96de2ba76724da506b329bfcb326f102db7f
150 Risk Score

Malware Insights

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

The PDF contains a mass external link farm, with a primary link pointing to a known malicious redirector. The document body, though heavily obfuscated, contains text and URLs related to converting base64 encoded PDFs to images, suggesting a social engineering lure. The ML classifier strongly indicates maliciousness. The primary IOC is the redirector URL, which is likely used to funnel victims to a malicious site.

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=convert+base64+pdf+to+base64+image+javascript
    • http://files.colettebeardall.com/uploads/1/3/1/4/131454012/vepaxofimowe_wodenepuba_wobikeguka.pdf
    • http://files.enrichmentcoop.com/uploads/1/3/1/3/131380177/podakikil-romatazunuk-bilijaji.pdf
    • http://files.northeastgafoodallergy.org/uploads/1/3/1/0/131070476/keluzujorojezan.pdf
    • http://files.doubledatepacking.com/uploads/1/3/1/6/131637606/fifanefuwojob.pdf
    • https://cdn.shopify.com/s/files/1/0440/2960/8101/files/328810165.pdf
    • https://cdn.shopify.com/s/files/1/0431/9186/1412/files/reviter.pdf
    • https://cdn.shopify.com/s/files/1/0430/2218/8701/files/82064002444.pdf
    • https://cdn.shopify.com/s/files/1/0433/3414/0056/files/fevexupemi.pdf
    • https://cdn.shopify.com/s/files/1/0434/5616/8093/files/79247098234.pdf
    • https://cdn.shopify.com/s/files/1/0435/4713/2063/files/affirmative_action_in_education.pdf
    • https://cdn.shopify.com/s/files/1/0430/0403/5221/files/36779663790.pdf
    • https://cdn.shopify.com/s/files/1/0431/8353/8331/files/savobavawulituxixiwe.pdf
    • https://cdn.shopify.com/s/files/1/0429/6173/1743/files/paracord_bullwhip.pdf
    • https://cdn.shopify.com/s/files/1/0438/5452/8677/files/tamil_news_paper_download_format.pdf
    • https://cdn.shopify.com/s/files/1/0437/9426/8320/files/72510221975.pdf
    • https://cdn.shopify.com/s/files/1/0435/5820/7651/files/critical_analysis_of_ulysses.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_off00006e65.bin
941d20e585f23e8bb1a0ca1861e18c60726127d3c1ce6731a42b807df13f869c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6E65 5864 bytes
font_01_sfnt_off00008259.bin
d7d5429801b35efc32b1a071292fe940cfb5e59c3c668024f430ec49a1ff043d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8259 14256 bytes

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