Malicious PDF — malware analysis report

Static analysis result for SHA-256 16b96e374508e93e…

MALICIOUS

PDF

59.6 KB Created: 2020-08-13 23:07:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d4c2dd99ef98890e6c21057d3ebfc5bd SHA-1: 20e07faaa3973e2c792e4d4333a0d3a41129da53 SHA-256: 16b96e374508e93ee12707a7020a2ed2295264b772d83eb291cfef2c901602d6
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, many of which point to a link farm designed to redirect users to malicious infrastructure. The primary redirector URL is https://ttraff.ru/pify?keyword=architectural+working+drawing+details+pdf, which is flagged as malicious. This suggests the document is part of a SEO poisoning or link farm attack to drive traffic to malicious sites.

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.ru/pify?keyword=architectural+working+drawing+details+pdf
    • http://figajinod.bakedbounties.com/uploads/1/3/0/8/130813366/5584074.pdf
    • http://salawof.remodistawomen2watch.com/uploads/1/3/1/4/131437605/ketesesibur.pdf
    • http://zaridabol.drmenn.com/uploads/1/3/1/3/131381679/3e76b54c208.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/9110/7742/files/80520128322.pdf
    • https://cdn.shopify.com/s/files/1/0434/2795/4853/files/fibovitojakimabuwejonu.pdf
    • https://cdn.shopify.com/s/files/1/0431/2599/7722/files/sakopifedebonebizawiwiw.pdf
    • https://cdn.shopify.com/s/files/1/0436/1266/8066/files/10578232265.pdf
    • https://cdn.shopify.com/s/files/1/0427/7056/3239/files/fijakanuvuvadugezali.pdf
    • https://cdn.shopify.com/s/files/1/0428/9586/8057/files/79646523810.pdf
    • https://cdn.shopify.com/s/files/1/0431/4054/6714/files/xolejudezijugusakerefe.pdf
    • https://cdn.shopify.com/s/files/1/0434/1871/4264/files/salelerefu.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/53059057271.pdf
    • https://cdn.shopify.com/s/files/1/0428/4511/0438/files/lusaxavexefop.pdf
    • https://cdn.shopify.com/s/files/1/0439/1682/0635/files/boxugatugaxata.pdf
    • https://cdn.shopify.com/s/files/1/0434/1760/0152/files/juwoxozuvatavitebuja.pdf
    • https://cdn.shopify.com/s/files/1/0429/9004/3285/files/zupizomokolemita.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/vemuvuferakodumi.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000abfb.bin
162be1e2f69787b9c57aafd6a9270e8b3bd3f0efafe47e1be7c92dfa49461b28		 pdf-font-stream PDF embedded font (sfnt) at offset 0xABFB 5564 bytes
font_01_sfnt_off0000bef8.bin
39d1faa990d35f80bf83a1cba0a542238c73a36115a0dac0beb67fc3db3b8edd		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBEF8 10040 bytes

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