Malicious PDF — malware analysis report

Static analysis result for SHA-256 44c73400368f2014…

MALICIOUS

PDF

42.7 KB Created: 2020-08-31 11:32:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 64ae0abd7563286e5be2fadad9a44e14 SHA-1: 2cd785ee9e25c0e36e92181524978f290651fab2 SHA-256: 44c73400368f20143538c7754cb314af0804f8defe759aa475ec4fc1b6dd66f2
120 Risk Score

Malware Insights

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

The PDF file contains a heuristic firing for PDF_MALICIOUS_REDIRECTOR_LINK, indicating it points to malicious infrastructure. The document body, though heavily obfuscated, contains text referencing 'mywritinglab answer key' and a URL that aligns with this lure. The PDF also exhibits characteristics of a link farm, with numerous embedded URLs, suggesting a broad distribution attempt. The primary malicious IOC is the redirector URL, which likely leads to further malicious content.

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=mywritinglab+answer+key
    • https://cdn.shopify.com/s/files/1/0429/0979/4463/files/sedipixipano.pdf
    • https://cdn.shopify.com/s/files/1/0432/6703/1200/files/branson_2210_ultrasonic_cleaner_manual.pdf
    • https://cdn.shopify.com/s/files/1/0435/5447/2087/files/39650427823.pdf
    • https://cdn.shopify.com/s/files/1/0439/3969/2699/files/xituz.pdf
    • https://cdn.shopify.com/s/files/1/0429/9803/8679/files/xojex.pdf
    • https://cdn.shopify.com/s/files/1/0438/3821/0205/files/8376277439.pdf
    • https://static.usrfiles.com/ugd/80c1db_45eb356460454504a3274573439ea93b.pdf
    • https://static.usrfiles.com/ugd/ac72e0_5a619139c0854cd8861c4cbc124362df.pdf
    • https://static.usrfiles.com/ugd/b0b521_27774084a9ee47bcaf0a4950b43324e9.pdf
    • https://static.usrfiles.com/ugd/b8c837_6d5e53d47c204919a03a7af38bd558b2.pdf
    • https://cdn.shopify.com/s/files/1/0432/9439/2485/files/final_accounts_format_of_a_company.pdf
    • https://cdn.shopify.com/s/files/1/0430/4030/9402/files/42504158725.pdf
    • https://cdn.shopify.com/s/files/1/0430/4296/3613/files/ielts_band_7_writing.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/tagitigupi.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_off00006951.bin
e6c1523fccdd5c0e22f964fdb18d835c5d2d723da2375ef139be24d08b7b7a6f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6951 5256 bytes
font_01_sfnt_off00007b5d.bin
9b19d157e7653829ff6f569a76c54df3bf82e853feaaeca8dc9478e8ca4f6ba5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7B5D 10324 bytes

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