Malicious PDF — malware analysis report

Static analysis result for SHA-256 bbc3750253919cfa…

MALICIOUS

PDF

56.3 KB Created: 2020-08-25 21:09:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a658732c35e303f96f55c73c89fb6106 SHA-1: 52c826779003326e5b37a1758ebc7e5521e1e41b SHA-256: bbc3750253919cfa29e3fe89db39271bb5b0e7cc46ccf871f3491eac4142ce80
150 Risk Score

Malware Insights

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

The PDF file contains a significant number of embedded links, with a critical heuristic firing indicating a link to a known malicious redirector. The document body, though heavily obfuscated, contains the URL 'https://ttraff.cc/pify?keyword=avance+par+dent+fz', which is likely used to redirect users to a malicious site. The presence of numerous Shopify-hosted PDF links suggests an attempt to create a link farm for SEO poisoning or to host malicious content.

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=avance+par+dent+fz
    • http://files.trofefashion.com/uploads/1/3/0/7/130739308/buput.pdf
    • https://cdn.shopify.com/s/files/1/0452/2328/0800/files/dawifip.pdf
    • https://cdn.shopify.com/s/files/1/0433/9879/1329/files/39135572871.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/40035930655.pdf
    • https://cdn.shopify.com/s/files/1/0438/9643/8936/files/34903631430.pdf
    • https://cdn.shopify.com/s/files/1/0432/8377/5643/files/xuleboxuziroluwodot.pdf
    • https://cdn.shopify.com/s/files/1/0431/2937/2821/files/jurnal_cacing_pita.pdf
    • https://cdn.shopify.com/s/files/1/0434/2625/0917/files/kavuwovomoxakosojop.pdf
    • https://cdn.shopify.com/s/files/1/0430/9699/8048/files/wto_agreement_on_rules_of_origin.pdf
    • https://cdn.shopify.com/s/files/1/0433/5920/7592/files/xowivos.pdf
    • https://cdn.shopify.com/s/files/1/0435/1524/8794/files/windows_defender_windows_8_64_bit.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_off00008efe.bin
947a849c7d5a1ec3a20179ce5e168039b60b5dab18352ea0b7bc4b5caea82d64		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8EFE 5040 bytes
font_01_sfnt_off0000a03a.bin
66498ad57ba228a87a4e52a2345a9d40c809540e9177578bfeb73ce1f3154460		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA03A 17376 bytes

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