Malicious PDF — malware analysis report

Static analysis result for SHA-256 2c9da7b362be65db…

MALICIOUS

PDF

37.0 KB Created: 2020-08-08 18:31:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d33321c4b97cc0198995a60d494e9851 SHA-1: 58a06bedd1a7baf2ba2934d650588aee69985fe1 SHA-256: 2c9da7b362be65db1d0d9aabc3643fbb8b7f9111973f382138ddf8b924dbf7a7
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many pointing to Shopify domains, but one critical link redirects to a known malicious infrastructure at 'ttraff.cc'. The document body, though partially corrupted, contains text related to a parasitology textbook download, suggesting a lure to trick users into clicking the malicious redirector. The ML classifier strongly flagged this PDF as malicious.

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=parasitologia+humana+neves+13+edi%25C3%25A7%25C3%25A3o+pdf+download
    • http://files.countrylivinginspiration.com/uploads/1/3/2/6/132683267/cf1e743f7ea.pdf
    • http://files.terryrich.co.uk/uploads/1/3/0/8/130874030/nolorux.pdf
    • http://files.primalqifitness.com/uploads/1/3/1/4/131437689/wolelazezegap.pdf
    • http://files.rockcreekvillage.org/uploads/1/3/1/4/131408798/5194535.pdf
    • http://files.saintdavidpdx.org/uploads/1/3/2/8/132815002/sakamoguwesefaniwa.pdf
    • https://cdn.shopify.com/s/files/1/0435/2750/4040/files/supernatural_season_4_episode_2.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/nimapudusakodinufuzexive.pdf
    • https://cdn.shopify.com/s/files/1/0432/9439/2485/files/25579977181.pdf
    • https://cdn.shopify.com/s/files/1/0434/1720/6946/files/4966864763.pdf
    • https://cdn.shopify.com/s/files/1/0434/5180/9957/files/37495053905.pdf
    • https://cdn.shopify.com/s/files/1/0427/7462/6470/files/zisode.pdf
    • https://cdn.shopify.com/s/files/1/0432/3305/0779/files/9655754218.pdf
    • https://cdn.shopify.com/s/files/1/0434/2287/5797/files/a_separate_peace_study_guide_answers.pdf
    • https://cdn.shopify.com/s/files/1/0434/6534/3126/files/joxidedizonumoneziji.pdf
    • https://cdn.shopify.com/s/files/1/0431/0764/7639/files/cds_gk_syllabus.pdf
    • https://cdn.shopify.com/s/files/1/0429/2853/7753/files/nesanufewobetanubatebiwaj.pdf
    • https://cdn.shopify.com/s/files/1/0431/4044/8407/files/tojajaperapaz.pdf
    • https://cdn.shopify.com/s/files/1/0431/8612/7009/files/58200472667.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_off00004af1.bin
ace1e25f365fee735e04d16974de00cf167d70043db47320eb9e9fc05f5b4de8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4AF1 6324 bytes
font_01_sfnt_off00005fc9.bin
d79dfe9cc7b8aadd918f56957944f751408397e6e3e29e0d38940040c8e04663		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5FC9 11700 bytes

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