Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5bfa69bda3d5d6f…

MALICIOUS

PDF

60.7 KB Created: 2020-08-31 00:02:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7aff5eff4c02653216ecf5e093b2bf19 SHA-1: 8ca49b1e5558010eea669e98b8d5d8e9e7077067 SHA-256: c5bfa69bda3d5d6f244b2ef56a2c25797faaf3b878ac5f666c4f19a2f9ec3f26
120 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, which is also present in the document body. This link is designed to lure users into clicking it by appearing to be an answer key. The PDF also contains a heuristic for a link farm, indicating a large number of external links, likely for SEO manipulation or to obscure malicious destinations. The primary malicious IOC is the redirector URL.

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/wix?keyword=biological+molecules+pogil+answer+key
    • https://cdn.shopify.com/s/files/1/0433/7215/0942/files/aarti_sangrah_marathi_song.pdf
    • https://cdn.shopify.com/s/files/1/0432/5372/7394/files/31553279315.pdf
    • https://cdn.shopify.com/s/files/1/0432/1496/2848/files/85450981726.pdf
    • https://cdn.shopify.com/s/files/1/0427/4647/8759/files/39400212011.pdf
    • https://static.usrfiles.com/ugd/7dd30d_9d1c9a442993401cb21c3e77187d4c6e.pdf
    • https://cdn.shopify.com/s/files/1/0431/8475/0747/files/vegibawoj.pdf
    • https://cdn.shopify.com/s/files/1/0431/2429/3794/files/fonuludafovugovifetoxo.pdf
    • https://cdn.shopify.com/s/files/1/0433/4184/0552/files/97794281483.pdf
    • https://cdn.shopify.com/s/files/1/0449/7879/8750/files/44900017589.pdf
    • https://cdn.shopify.com/s/files/1/0433/0579/5752/files/hepatitis_c_treatment_guidelines_ppt.pdf
    • https://cdn.shopify.com/s/files/1/0432/6467/1909/files/air_pollution_causes_and_control.pdf
    • https://cdn.shopify.com/s/files/1/0459/2805/4951/files/aep_ohio_power_outage_report.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_off0000b119.bin
4cd6ca3b7543ecf33bdd140fdc6fa092cc549c80a08b099216b7222450fe4fbd		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB119 5560 bytes
font_01_sfnt_off0000c408.bin
2321abab1cf697b784bcb2dc616adfcafb103a8dd1b0d75077a1e265c5cfa3b2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC408 9860 bytes

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