Malicious PDF — malware analysis report

Static analysis result for SHA-256 f2859fdd8517eb8a…

MALICIOUS

PDF

37.7 KB Created: 2020-07-22 08:54:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b922a5579d08d1aed65116d07669648b SHA-1: 8f2f132182779e0754395baaeff7e24b3bf6d8b4 SHA-256: f2859fdd8517eb8aa53d5e309c79c865c03035a2033186388c0807f5d8a895e3
150 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and contains numerous embedded links. One critical heuristic indicates that the PDF links to known malicious redirector infrastructure, specifically 'ttraff.ru'. Another critical heuristic identifies a large number of external PDF links, suggesting an SEO poisoning or link farm tactic. The ML classifier output of 0.999991 further supports the malicious nature of this file.

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.ru/wb?keyword=volume%20of%20composite%20figures%20pdf
    • http://files.studioplumpiano.com/uploads/1/3/1/3/131383497/70178f76b.pdf
    • http://files.alaskarecyclingcenter.com/uploads/1/3/0/7/130776368/rigodo_lofusef.pdf
    • http://files.wisewomenofblaircounty.org/uploads/1/3/1/6/131636990/4ed9ecac8e9.pdf
    • http://files.wisewomenofblaircounty.org/uploads/1/3/1/6/131636990/4ed9
    • https://cdn.shopify.com/s/files/1/0433/3050/2806/files/kiriposetizipiduduw.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/45598155969.pdf
    • https://cdn.shopify.com/s/files/1/0436/3331/1904/files/374233071.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/78046530146.pdf
    • https://cdn.shopify.com/s/files/1/0430/5253/1869/files/8114747498.pdf
    • https://mizemadene.files.wordpress.com/2020/07/vusifimujojuzajiwin.pdf
    • https://narenuzur.files.wordpress.com/2020/07/61901965785.pdf
    • https://lidalavanepu.files.wordpress.com/2020/06/xorewokajigiliboxa.pdf
    • https://cdn.shopify.com/s/files/1/0431/2032/8853/files/bewazitan.pdf
    • https://cdn.shopify.com/s/files/1/0431/6623/6826/files/83455931539.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/tovovowegafakaroseras.pdf
    • https://cdn.shopify.com/s/files/1/0435/8252/1503/files/xujekukebib.pdf
    • https://cdn.shopify.com/s/files/1/0432/2403/9592/files/taxajuk.pdf
    • https://cdn.shopify.com/s/files/1/0429/4439/7468/files/5344777463.pdf
    • https://cdn.shopify.com/s/files/1/0431/1223/5159/files/sexafi.pdf
    • https://cdn.shopify.com/s/files/1/0429/3355/1260/files/kepasanad.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_off000057b5.bin
d5c3b46e7b81ec52114df0fb82ae39a7b8517c10d301dc9a677ca166aad628f6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x57B5 5004 bytes
font_01_sfnt_off000068cd.bin
249565d1ae1a7a107e44b0842b394c2db2fe370da957226627bdad68ae3b8829		 pdf-font-stream PDF embedded font (sfnt) at offset 0x68CD 9564 bytes

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