Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c9a073fe6722a36…

MALICIOUS

PDF

46.6 KB Created: 2020-08-20 11:53:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5abd4e141bd75b72e1bf2ff592070ea0 SHA-1: e6ae8685285d4321efa89699cde400f65b2cfcca SHA-256: 3c9a073fe6722a369a4beab360b3693320ffabaa31d5b00190cdca08e8653b73
120 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded links, many of which point to external resources disguised as academic documents. One critical heuristic identified a link to a known malicious redirector, ttraff.cc, which is likely used to obscure the final malicious destination. The document body, though partially corrupted, contains text related to 'bksb english initial assessment answers', suggesting a lure to trick users into clicking the malicious link under the guise of educational 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/pify?keyword=bksb+english+initial+assessment+answers
    • http://babevaj.hoclincolnorders.com/uploads/1/3/1/0/131070374/cf79eaa62ecb5c.pdf
    • http://files.darnhallparish.co.uk/uploads/1/3/2/6/132683264/simalaganopoguweje.pdf
    • http://valena.sianyeshe.com/uploads/1/3/2/6/132682879/pibujinosa_vixilinudinut_visik_vaxezapukalenil.pdf
    • https://cdn.shopify.com/s/files/1/0432/3092/0871/files/bsc_3rd_year_inorganic_chemistry_notes.pdf
    • https://cdn.shopify.com/s/files/1/0430/7176/6677/files/zitagonemebekasitipudade.pdf
    • https://cdn.shopify.com/s/files/1/0432/5353/0782/files/duxikuk.pdf
    • https://cdn.shopify.com/s/files/1/0429/9112/4643/files/bedakow.pdf
    • https://cdn.shopify.com/s/files/1/0430/1658/5379/files/nureremadesa.pdf
    • https://cdn.shopify.com/s/files/1/0431/5725/8401/files/gagizetozojaxiputazovi.pdf
    • https://cdn.shopify.com/s/files/1/0428/0070/9791/files/25705798602.pdf
    • https://cdn.shopify.com/s/files/1/0439/4123/2795/files/biological_theory_of_crime.pdf
    • https://cdn.shopify.com/s/files/1/0430/8900/2650/files/27637411019.pdf
    • https://cdn.shopify.com/s/files/1/0433/1290/6405/files/luxujani.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_off0000788b.bin
cf94250646c3554142da34721fee572fbaba8bd20d95d2d99f53c862d0bb2d6c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x788B 5444 bytes
font_01_sfnt_off00008af3.bin
8040883f822848481fb261d5f75aa1e0caa1861a7ef38f4be232eaa22030dbd6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8AF3 10168 bytes

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