Malicious PDF — malware analysis report

Static analysis result for SHA-256 f20fd86bc471dbbd…

MALICIOUS

PDF

36.3 KB Created: 2020-08-11 02:07:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a49d6fa351685edfca36e6a851c1ced2 SHA-1: 9a00517fe074b3f0aa508fd4d4ed42a984b0622d SHA-256: f20fd86bc471dbbda8d31d2f494582ffc27b75c7db1f22cb9f7b3e208c377cf9
150 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with one specifically pointing to a known malicious redirector. The ML classifier also strongly indicated maliciousness. The presence of a link farm suggests an attempt to distribute malicious content or phish users. No scripts were extracted, but the PDF structure itself is indicative of a malicious lure.

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/wb?keyword=texturas%20dibujo%20arquitectonico%20pdf
    • http://lepixowu.clanlafferty.org/uploads/1/3/1/4/131482975/masin.pdf
    • http://files.beo-foto.com/uploads/1/3/1/0/131070859/414d3429f5f6.pdf
    • http://files.houndshangout.ca/uploads/1/3/1/4/131407761/2803822.pdf
    • http://files.youth4ti.org/uploads/1/3/0/8/130813645/eaf9157a0a6.pdf
    • http://files.fasterfitnesssolutions.com/uploads/1/3/1/4/131406739/e73d001.pdf
    • https://cdn.shopify.com/s/files/1/0438/7730/2427/files/retowunojekufekilig.pdf
    • https://cdn.shopify.com/s/files/1/0437/5710/9399/files/interior_design_and_architecture_company_profile.pdf
    • https://cdn.shopify.com/s/files/1/0431/6571/2535/files/practical_management_science_5th_edition.pdf
    • https://cdn.shopify.com/s/files/1/0435/3651/5221/files/11564084727.pdf
    • https://cdn.shopify.com/s/files/1/0427/7328/2983/files/girunifiviluvesesitusapu.pdf
    • https://cdn.shopify.com/s/files/1/0429/7018/5879/files/74756294114.pdf
    • https://cdn.shopify.com/s/files/1/0431/6885/8276/files/27260959187.pdf
    • https://cdn.shopify.com/s/files/1/0438/5924/7264/files/rigujuded.pdf
    • https://cdn.shopify.com/s/files/1/0436/2534/9273/files/gobeneru.pdf
    • https://cdn.shopify.com/s/files/1/0438/7323/9195/files/81647613515.pdf
    • https://cdn.shopify.com/s/files/1/0432/0660/7012/files/853682724.pdf
    • https://cdn.shopify.com/s/files/1/0438/2988/7136/files/83296825876.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_off00004d53.bin
9af784d872c02a9ab7f7aec0112665b2e2d5e49b468191f8e8cf5f09ba826a1f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4D53 5476 bytes
font_01_sfnt_off00005fff.bin
2cf8f2f3a228ce99737e620ae1473c5b8fedf1f8cfde84a70fb34839933e8855		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5FFF 10648 bytes

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