Malicious PDF — malware analysis report

Static analysis result for SHA-256 ccad62d734537e5a…

MALICIOUS

PDF

51.5 KB Created: 2020-08-09 15:44:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ec97888830eee35865cce386f2165f09 SHA-1: 70573ccdae11bd51a6b6654237a0fd0096ac391c SHA-256: ccad62d734537e5a17f3c266dd4dbfc510f52337e14541a0c3b805f0f48d3a60
154 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to Shopify domains hosting other PDFs, but one critical link redirects through 'ttraff.ru', a known malicious redirector. This suggests a link farm or redirection tactic to obscure the final malicious destination. The ML classifier also strongly flagged this PDF as malicious. The document body text is largely garbled but contains the phrase 'Define ethical leadership pdf', likely a lure to encourage clicks on the embedded links.

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.ru/pify?keyword=define+ethical+leadership+pdf
    • http://files.kramersearch.com/uploads/1/3/0/8/130814754/gedokitiwedi_bimowojesuguv.pdf
    • http://sumonug.buffalotrailers.co.uk/uploads/1/3/0/7/130775971/83e27751cb9.pdf
    • http://files.americasschoonercup.com/uploads/1/3/0/9/130969404/8255926.pdf
    • http://kirerapad.reusinbysusan.com/uploads/1/3/2/7/132740900/zumagizusile.pdf
    • http://files.lambersfisher.com/uploads/1/3/1/6/131606087/fikojuno-tanaz-zofaliwiwiguw.pdf
    • https://cdn.shopify.com/s/files/1/0430/0210/1923/files/zawobilelujojugoke.pdf
    • https://cdn.shopify.com/s/files/1/0434/0776/9750/files/3rd_grade_spelling_list.pdf
    • https://cdn.shopify.com/s/files/1/0433/5622/5688/files/kasafipabirir.pdf
    • https://cdn.shopify.com/s/files/1/0429/3882/6908/files/modopij.pdf
    • https://cdn.shopify.com/s/files/1/0440/8927/8616/files/ranged_guide_osrs.pdf
    • https://cdn.shopify.com/s/files/1/0434/6871/8233/files/41308138877.pdf
    • https://cdn.shopify.com/s/files/1/0440/6480/0918/files/cesare_pavese_books.pdf
    • https://cdn.shopify.com/s/files/1/0428/2492/5347/files/39258271266.pdf
    • https://cdn.shopify.com/s/files/1/0439/9045/0334/files/define_annotations.pdf
    • https://cdn.shopify.com/s/files/1/0438/3201/7058/files/52182938767.pdf
    • https://cdn.shopify.com/s/files/1/0427/7973/8278/files/dakudilubakugumawexewax.pdf
    • https://cdn.shopify.com/s/files/1/0438/0337/7824/files/nuwoxisanudakuwoxa.pdf
    • https://cdn.shopify.com/s/files/1/0437/4393/6673/files/36826305797.pdf
    • https://cdn.shopify.com/s/files/1/0430/0688/6051/files/22870310554.pdf
    • https://cdn.shopify.com/s/files/1/0428/4809/2323/files/pomexizogugevido.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_off00008ad0.bin
5539be6061999d10f34436129d6b549472cab29fa287fecf2ca42ec29966f7dc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8AD0 5240 bytes
font_01_sfnt_off00009ca9.bin
d8f0a9cb21cca1c445225b54e5c741a7fca623e65eb7cb70f2ac3d15ae0a15b5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9CA9 10676 bytes

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