Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a807b5be688eeca…

MALICIOUS

PDF

35.4 KB Created: 2020-09-04 12:41:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ef216224acf5db631f9b7843450e3cb7 SHA-1: 7c73a6d0b4ab3a4f17d6df7d0ed2ec969c4fca26 SHA-256: 3a807b5be688eecac37933cbae606ead4d3e277ddc11a9b5c7717a61813884e7
150 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to a link farm designed for SEO manipulation. One of these links, https://ttraff.ru/wix?keyword=chromosome+karyotype+lab+answers, is identified as a known malicious redirector. The document body, though heavily obfuscated, contains text related to 'chromosome karyotype lab answers' and the malicious URL, suggesting a lure to trick users into visiting the redirector. The ML classifier also strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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.ru/wix?keyword=chromosome+karyotype+lab+answers
    • https://static.usrfiles.com/ugd/d3758e_770efab1662e4904a0924946d9730a56.pdf
    • https://static.usrfiles.com/ugd/d9f7b5_b2239fb7653045d0a07dbc3574d68b55.pdf
    • https://static.usrfiles.com/ugd/b8c837_20652ef29dcb4abfa66273afb9b095cf.pdf
    • https://static.usrfiles.com/ugd/585b1d_a3526f52fb5541449aad361befba1031.pdf
    • https://static.usrfiles.com/ugd/d01287_2fbb9554f84f49c79c3e37f45ab0509c.pdf
    • https://cdn.shopify.com/s/files/1/0428/3380/5471/files/22260260421.pdf
    • https://cdn.shopify.com/s/files/1/0433/3076/4968/files/45920423431.pdf
    • https://cdn.shopify.com/s/files/1/0437/3551/5290/files/financial_reporting_act_2011.pdf
    • https://cdn.shopify.com/s/files/1/0431/0892/5602/files/tubojafetiwad.pdf
    • https://cdn.shopify.com/s/files/1/0434/9375/2997/files/biology_notes_download.pdf

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000054c6.bin
4ef6dc3ee6e805fd8b34ff5e36c4884f0d4782ed946e55a75b841e09ef096cf5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x54C6 5364 bytes
font_01_sfnt_off000066df.bin
b7bab12b7fdbcac5314cdbd69733a1a140d49ef5cd94b98086cfd9da64f10852		 pdf-font-stream PDF embedded font (sfnt) at offset 0x66DF 10448 bytes

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