Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7a91226a0e58c3b…

MALICIOUS

PDF

71.1 KB Created: 2020-08-16 20:18:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2f1a3364556bf9ac6e6b091dc0683ffa SHA-1: 39afb4c63178a3d7e8b05718d1453a5fe6b4d7e7 SHA-256: b7a91226a0e58c3b8654b5aee3761586f5e19d41c67ae0eb97956c42015dd34f
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains a malicious redirector link disguised as an answer key, which leads to a link farm. The ML classifier strongly indicates maliciousness. The primary malicious IOC is the redirector URL, which is designed to lead users to further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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=csat+2016+answer+key+vajiram
    • http://rofasez.uhsbe.org/uploads/1/3/2/6/132681501/pefagise.pdf
    • https://cdn.shopify.com/s/files/1/0428/1411/1903/files/67799186377.pdf
    • https://cdn.shopify.com/s/files/1/0428/9642/5119/files/8176084971.pdf
    • https://cdn.shopify.com/s/files/1/0440/0391/7974/files/biology_science_for_life_with_physiology.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/84302935330.pdf
    • https://cdn.shopify.com/s/files/1/0435/7577/1304/files/18469263641.pdf
    • https://cdn.shopify.com/s/files/1/0433/5131/0488/files/pifosukisuduf.pdf
    • https://cdn.shopify.com/s/files/1/0429/2729/2582/files/a_an_the_zero_article_exercises_with_answers.pdf
    • https://cdn.shopify.com/s/files/1/0430/7540/3936/files/97591149998.pdf
    • https://cdn.shopify.com/s/files/1/0433/4151/2855/files/21_cfr_part_11_validation.pdf
    • https://cdn.shopify.com/s/files/1/0430/7514/1783/files/bivazorizak.pdf
    • https://cdn.shopify.com/s/files/1/0440/2230/0822/files/jquery_download.pdf
    • https://cdn.shopify.com/s/files/1/0432/3377/1688/files/gigovusemazopata.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_off0000d900.bin
91671b70a3d7a5d9360f1a71b14a3279af3442b76de5b2d6c237690a238f4122		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD900 5580 bytes
font_01_sfnt_off0000ec0d.bin
fe6f79897e1e8fe38ba56827386a41849e7146994b68637900cddbfee64263cb		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEC0D 10376 bytes

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