Malicious PDF — malware analysis report

Static analysis result for SHA-256 f6a21899c6b29880…

MALICIOUS

PDF

45.4 KB Created: 2020-08-15 08:08:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 998dd9fb1d9ae837093b2eaa85d8e943 SHA-1: 2d7a8bfcd286b549767137de1211b6406ca26dd0 SHA-256: f6a21899c6b2988054d6afeb7260bf11dd881280b20c51745d669ce2583a99a1
150 Risk Score

Malware Insights

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

The PDF was flagged by multiple critical heuristics for containing malicious redirector links and a large number of external PDF links, indicative of a link farm. One of the embedded URLs, 'https://ttraff.com/pify?keyword=high+density+pu+foam+sheet', is identified as a known malicious redirector. The document body contains garbled text and metadata suggesting it was generated by wkhtmltopdf, a tool often used to create SEO-optimized PDFs for link farms. The primary intent appears to be directing users to potentially malicious external sites.

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=high+density+pu+foam+sheet
    • http://files.toronto-dialabottle.com/uploads/1/3/0/7/130739028/eec740ed17b2.pdf
    • http://files.hepatitiscmsg.org/uploads/1/3/0/7/130739333/313615.pdf
    • http://files.imogendickie.net/uploads/1/3/0/7/130776265/mamefidu.pdf
    • http://files.musicacollinadoro.com/uploads/1/3/0/7/130775357/56fb4a537f.pdf
    • http://files.livelearnsurvive.org/uploads/1/3/2/3/132302960/gemalib.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/69865881622.pdf
    • https://cdn.shopify.com/s/files/1/0428/1909/2647/files/91876799181.pdf
    • https://cdn.shopify.com/s/files/1/0429/2804/6233/files/rifewizizalazim.pdf
    • https://cdn.shopify.com/s/files/1/0429/4931/2665/files/vozewovowezovamilovoro.pdf
    • https://cdn.shopify.com/s/files/1/0433/4161/1159/files/bass_guitar_books_for_beginners.pdf
    • https://cdn.shopify.com/s/files/1/0435/3956/2645/files/shadow_of_the_day_lyrics.pdf
    • https://cdn.shopify.com/s/files/1/0431/5476/8032/files/lowatobof.pdf
    • https://cdn.shopify.com/s/files/1/0433/0763/0747/files/chemistry_dictionary_free_for_pc.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_off000067ae.bin
eb71e706231aa2581405d7fcf59b306574d1176bd36f4917950c9cfdbf97fb78		 pdf-font-stream PDF embedded font (sfnt) at offset 0x67AE 5388 bytes
font_01_sfnt_off000079e8.bin
20fd4855c43ed61cc1b49f45a6bac9ad3e786dd691a58d8c348d7725a185f937		 pdf-font-stream PDF embedded font (sfnt) at offset 0x79E8 15180 bytes

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