Malicious PDF — malware analysis report

Static analysis result for SHA-256 73f2a99b0086264e…

MALICIOUS

PDF

50.0 KB Created: 2020-08-24 14:11:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8fd4f9d16758a2a3b15d95abbd3b3946 SHA-1: ad519df65a1a9079069f0ac39c085cd1468141a9 SHA-256: 73f2a99b0086264e505cf43911dc7f8303ff1b60871d14d43c480b1c5c92009f
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a heuristic firing indicating it links to known malicious redirector infrastructure, specifically pointing to 'ttraff.com'. The document body, though heavily obfuscated, also contains this URL, suggesting an attempt to lure users to a malicious site. The presence of numerous Shopify links, some flagged as benign and others unknown, further supports the SEO link farm heuristic, indicating a pattern of generating traffic to potentially malicious destinations.

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=batata+doce+assada+informa%25C3%25A7%25C3%25A3o+nutricional
    • http://bifeluge.millworksart.com/uploads/1/3/1/3/131380600/5206496.pdf
    • http://files.connoisseurstours.com/uploads/1/3/1/8/131857071/abaa266e7dc9a.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/takuz.pdf
    • https://cdn.shopify.com/s/files/1/0428/7715/7542/files/aspiration_pneumonia_management.pdf
    • https://cdn.shopify.com/s/files/1/0427/9091/2159/files/luwawo.pdf
    • https://cdn.shopify.com/s/files/1/0433/5403/0231/files/libro_aristoteles_politica.pdf
    • https://cdn.shopify.com/s/files/1/0432/5012/2916/files/38472210117.pdf
    • https://cdn.shopify.com/s/files/1/0428/1863/3894/files/24881957944.pdf
    • https://cdn.shopify.com/s/files/1/0428/4612/6247/files/list_of_waterfalls_in_kerala.pdf
    • https://cdn.shopify.com/s/files/1/0438/8211/9323/files/89559522988.pdf
    • https://cdn.shopify.com/s/files/1/0432/1335/7214/files/52164172611.pdf
    • https://cdn.shopify.com/s/files/1/0427/9340/2534/files/55194946563.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000709e.bin
a16dafd49b6349cda97287114ecb81e3a77430303d3b4b36e7107eb969fb1024
pdf-font-stream PDF embedded font (sfnt) at offset 0x709E 5596 bytes
font_01_sfnt_off000082a3.bin
b06fdf011030a433b79a92786c1e9cd47784771d699b9c01239f28413251b27e
pdf-font-stream PDF embedded font (sfnt) at offset 0x82A3 13476 bytes
font_02_sfnt_off0000aaf6.bin
0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333
pdf-font-stream PDF embedded font (sfnt) at offset 0xAAF6 4324 bytes