Malicious PDF — malware analysis report

Static analysis result for SHA-256 d7b48d6c7df49f22…

MALICIOUS

PDF

42.8 KB Created: 2020-08-18 21:48:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a245254f3b846cc1b28c663cc9210763 SHA-1: c64e73ba2def1e6726967fb0f6314daa73720695 SHA-256: d7b48d6c7df49f22c1a3c5ada00d16238cca6fe70b5eb148c5fc415b6140d645
150 Risk Score

Malware Insights

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

The PDF contains a significant number of embedded links, with a critical heuristic identifying it as a link farm. One of the primary links directs to a known malicious redirector service, ttraff.cc, which is likely used to obscure the ultimate malicious destination. The ML classifier also flagged this PDF with high confidence. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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=tableau+desktop+certification+study+guide
    • http://files.grdroofremoval.com/uploads/1/3/2/8/132814097/4dc143f.pdf
    • http://files.shopkattandblouse.com/uploads/1/3/0/8/130814623/4428457.pdf
    • http://files.katherinebelisle.com/uploads/1/3/1/4/131409090/fozavakarajewonaf.pdf
    • https://cdn.shopify.com/s/files/1/0433/0484/5465/files/appointment_letter_format_download.pdf
    • https://cdn.shopify.com/s/files/1/0434/0298/5621/files/xibogujirewuwapera.pdf
    • https://cdn.shopify.com/s/files/1/0433/6985/7176/files/51861230444.pdf
    • https://cdn.shopify.com/s/files/1/0432/7692/7141/files/gijimipamiz.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/novorubafiwani.pdf
    • https://cdn.shopify.com/s/files/1/0449/4550/6459/files/canon_in_d_piano_download.pdf
    • https://cdn.shopify.com/s/files/1/0430/2936/4889/files/champva_claim_form.pdf
    • https://cdn.shopify.com/s/files/1/0433/2178/6521/files/kibafidiwufupo.pdf
    • https://cdn.shopify.com/s/files/1/0432/8249/7701/files/dokoburixaw.pdf
    • https://cdn.shopify.com/s/files/1/0429/7133/2767/files/vufafatekutaso.pdf
    • https://cdn.shopify.com/s/files/1/0429/1824/8601/files/lejewubewalalo.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_off00006720.bin
1954bea0f3cbe8ff603c15cdff675af2907a4122499bea3da8f1c6473e6cadbf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6720 5580 bytes
font_01_sfnt_off00007a2d.bin
a8deae2e5a1e4ddbb5e8575a8dc43a803e8d2f70c79a39c027422d1d426c9de4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7A2D 10612 bytes

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