Malicious PDF — malware analysis report

Static analysis result for SHA-256 25bf08ac89a5a95e…

MALICIOUS

PDF

43.2 KB Created: 2020-08-05 23:47:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: bb80a121c14cd1725a7a8d366d41b619 SHA-1: 0c097364b1ddf13fa5c17498e6b1af23cd751724 SHA-256: 25bf08ac89a5a95edad7891f65262072c632d381faeb8868ff2dd3f3eb417a50
150 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, ttraff.com, disguised as a link to an "animal cell anatomy pdf". This redirector likely leads to a malicious payload. The PDF also contains a large number of embedded links, many pointing to Shopify domains, which is characteristic of SEO link farm abuse to increase search engine visibility for malicious content. The ML classifier also strongly indicated maliciousness.

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.com/pify?keyword=animal+cell+anatomy+pdf
    • http://files.perfectbreakcaravans.com/uploads/1/3/2/7/132740270/zenari_tiranibapo_wukilepanese_kedafamowugiwom.pdf
    • http://files.yuriokahana.com/uploads/1/3/2/7/132712483/tirefibivoden_wifuk_renan_mewovapo.pdf
    • http://files.veroniquevanduurling.com/uploads/1/3/1/4/131411539/4020817.pdf
    • http://files.rspfitness.com/uploads/1/3/2/6/132681201/9843275.pdf
    • https://cdn.shopify.com/s/files/1/0436/6788/2134/files/94661328341.pdf
    • https://cdn.shopify.com/s/files/1/0439/2130/9851/files/dune_butlerian_jihad.pdf
    • https://cdn.shopify.com/s/files/1/0427/9074/8316/files/10710703193.pdf
    • https://cdn.shopify.com/s/files/1/0433/7870/4536/files/css_text_shadow.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/99397771733.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/41448402009.pdf
    • https://cdn.shopify.com/s/files/1/0435/4883/6004/files/sworn_statement_example.pdf
    • https://cdn.shopify.com/s/files/1/0432/6827/6384/files/17315388723.pdf
    • https://cdn.shopify.com/s/files/1/0429/2981/5705/files/aluminium_6061_properties.pdf
    • https://cdn.shopify.com/s/files/1/0431/1983/7333/files/jakokadakasewikiz.pdf
    • https://cdn.shopify.com/s/files/1/0434/4902/4669/files/zasuzawor.pdf
    • https://cdn.shopify.com/s/files/1/0436/2731/5353/files/how_to_bold_text_on_discord.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_off00006b88.bin
76aed4401a202dedc72e5d0ec3264224abb0fcdbfc4dad3c4f84fdc546d9292a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6B88 5120 bytes
font_01_sfnt_off00007cf2.bin
aa94f1969ebd3d686e3433c73159d48c36087e750c55833892586371bd28b7cd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7CF2 10216 bytes

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