Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf2c34a4be9c321c…

MALICIOUS

PDF

52.7 KB Created: 2020-08-06 05:40:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e5b1848dc8778eabaf19e95fa5ee0b78 SHA-1: 431b84d8b0612e773893752ee27c83013ce13285 SHA-256: cf2c34a4be9c321c86e83783766e22230eeef7e49f531c44a88f670258097d66
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'ttraff.com'. Additionally, it exhibits characteristics of a PDF link farm, with numerous embedded URLs, many hosted on Shopify. The document body, though obfuscated, contains the same URL as the redirector. The primary intent appears to be directing users to malicious infrastructure through a deceptive link.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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=class+d+amplifier+design+pdf
    • http://files.genesislactation.com/uploads/1/3/0/7/130775520/2196423.pdf
    • http://files.rightseed.com/uploads/1/3/1/4/131453605/5415078.pdf
    • http://files.stthomasaquinascharnwood.com/uploads/1/3/0/7/130776676/davuxav-lusotagegojumak.pdf
    • https://cdn.shopify.com/s/files/1/0432/9259/0236/files/zokolibudikol.pdf
    • https://cdn.shopify.com/s/files/1/0432/2636/6111/files/bunulikefi.pdf
    • https://cdn.shopify.com/s/files/1/0429/0550/1852/files/45083668758.pdf
    • https://cdn.shopify.com/s/files/1/0432/8531/5737/files/sawojufomisozalewetit.pdf
    • https://cdn.shopify.com/s/files/1/0440/8049/6792/files/pulomelovijepiwazukaluna.pdf
    • https://cdn.shopify.com/s/files/1/0435/1596/9688/files/59749320519.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/77363931764.pdf
    • https://cdn.shopify.com/s/files/1/0432/3239/5426/files/antibioticos_carbapenemicos.pdf
    • https://cdn.shopify.com/s/files/1/0432/4474/8950/files/rumupiror.pdf
    • https://cdn.shopify.com/s/files/1/0432/7846/7222/files/9132313335.pdf
    • https://cdn.shopify.com/s/files/1/0429/5517/8150/files/xilopoxuxufe.pdf
    • https://cdn.shopify.com/s/files/1/0428/2348/3548/files/mesimedarekinorabit.pdf
    • https://cdn.shopify.com/s/files/1/0431/3012/6496/files/lesolovitorugabotew.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007d51.bin
57dc7c4e065bfeb04d7703931cfe3619415ce2048dfbfe589c3885f6c6a70eb8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7D51 4980 bytes
font_01_sfnt_off00008e22.bin
bee4134216c626d9c8643dcb6300129486a3b37ccf3cc2ea4956be149459ceb8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8E22 12948 bytes
font_02_sfnt_off0000b732.bin
1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB732 4324 bytes

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