Malicious PDF — malware analysis report

Static analysis result for SHA-256 a91ef42d8201af8a…

MALICIOUS

PDF

42.0 KB Created: 2020-08-30 21:10:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b80ec1ed93dcfe0fd1624be943d148e9 SHA-1: 6dc099bac56cf7946292bc2bc325f6502dcede70 SHA-256: a91ef42d8201af8ad2381078a72cc9fb1efdc80c2dc37fc74f69452b9df6d05a
150 Risk Score

Malware Insights

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

The PDF contains a significant number of embedded links, with a critical heuristic firing for a malicious redirector. The document body, though heavily obfuscated, contains a URL that matches the redirector heuristic. The presence of numerous external PDF links suggests a link farm or SEO manipulation tactic, potentially leading to malicious content or phishing pages.

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/wix?keyword=momentos+de+la+escritura
    • https://cdn.shopify.com/s/files/1/0437/4636/1505/files/kuvajifetos.pdf
    • https://cdn.shopify.com/s/files/1/0429/7208/6423/files/small_compressor_offline.pdf
    • https://cdn.shopify.com/s/files/1/0431/3609/0267/files/42027629114.pdf
    • https://cdn.shopify.com/s/files/1/0431/4356/1376/files/tepimoxufum.pdf
    • https://cdn.shopify.com/s/files/1/0428/1332/5471/files/95179379353.pdf
    • https://static.usrfiles.com/ugd/77941b_4dab3f4371b64fbea46092c2e5dc0e66.pdf
    • https://static.usrfiles.com/ugd/e2c250_9f1c81a7e2cf4fdba8ea47aed1965a15.pdf
    • https://static.usrfiles.com/ugd/fac845_bf7086a9b02e4c0b99665299aab869d9.pdf
    • https://static.usrfiles.com/ugd/b910ae_4c3fb3e199274c1b9b407028e7f24e34.pdf
    • https://static.usrfiles.com/ugd/19103d_0d0b2f3f70904fa48a25a542a682f1bd.pdf
    • https://cdn.shopify.com/s/files/1/0434/3031/4133/files/43637938876.pdf
    • https://cdn.shopify.com/s/files/1/0436/0473/8206/files/38128216785.pdf
    • https://cdn.shopify.com/s/files/1/0429/3564/8409/files/kodonotusetixozevebazut.pdf
    • https://cdn.shopify.com/s/files/1/0430/9306/5877/files/een_informele_brief_schrijven_in_het_engels.pdf
    • https://cdn.shopify.com/s/files/1/0434/5410/3713/files/20255469203.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_off000065cb.bin
304f81c1eb76d58fc08b65d3be90873bb2a5e401dd9ad2482daa9f7d9856daf4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x65CB 5088 bytes
font_01_sfnt_off00007704.bin
931bef739a212a1f05af1e6b52549e7f41bca65b950b191cfa67763a3d20d599		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7704 11224 bytes

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