Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f7160dfe5d77e58…

MALICIOUS

PDF

35.3 KB Created: 2020-09-18 10:11:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a2473c59cab5d61828fa96b64ad7f92c SHA-1: 24d49bf93913c3db71deb1cd3625287407389817 SHA-256: 7f7160dfe5d77e583ba02fb322c57dede1547d335bedca0ee98ec73a02a0885a
150 Risk Score

Malware Insights

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

The PDF contains a heuristic firing for a malicious redirector link, pointing to 'https://ttraff.link/wix?keyword=chemistry+atomic+structure+test+answers'. This URL is likely used to deliver a malicious payload or redirect the user to a phishing site. The document also contains a large number of embedded links, many hosted on cdn.shopify.com, which is flagged as a PDF link farm. 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.link/wix?keyword=chemistry+atomic+structure+test+answers
    • http://files.littletonpreschool.com/uploads/1/3/1/3/131383247/9020344.pdf
    • http://files.mx.catalinapacificunderground.com/uploads/1/3/1/1/131164199/midalob.pdf
    • http://pesop.meredithkaler.com/uploads/1/3/1/4/131408022/vofedenerufuje.pdf
    • https://cdn.shopify.com/s/files/1/0439/4074/1275/files/19416249990.pdf
    • https://cdn.shopify.com/s/files/1/0462/2879/9639/files/62831634853.pdf
    • https://cdn.shopify.com/s/files/1/0428/3580/4319/files/95275397872.pdf
    • https://cdn.shopify.com/s/files/1/0437/2480/0168/files/5e_arcane_trickster_prepared_spells.pdf
    • https://cdn.shopify.com/s/files/1/0431/0820/4708/files/44149673031.pdf
    • https://cdn.shopify.com/s/files/1/0428/2430/2759/files/67698129011.pdf
    • https://cdn.shopify.com/s/files/1/0432/1725/6605/files/gosesodamutox.pdf
    • https://cdn.shopify.com/s/files/1/0435/7285/4939/files/ubuntu_16._04_32_bit_iso_image.pdf
    • https://f1003f2c-1160-43f6-a22a-6e1ccc32a89b.filesusr.com/ugd/1cc777_0cd39e2dd85b41ac8f356cb16f0a4eb2.pdf?index=true
    • https://424790d6-b654-42b7-82fb-7f18d02b6867.filesusr.com/ugd/5e81b9_3428881349dd45ad95afb6f5ac4c475d.pdf?index=true
    • 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_off00004c82.bin
07d03e8624155564bb3d2c5509faeeeb10a11752e4f3e43b01fd01a7cd132252		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4C82 5104 bytes
font_01_sfnt_off00005dbf.bin
948d531e8c5561111b09a1923872a070130f39169eac139180086baf509a6e3a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5DBF 10228 bytes

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