Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c2e6e535cd3bce1…

MALICIOUS

PDF

43.3 KB Created: 2020-08-29 17:47:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0332de8f0f46b746756453cfc4cb947e SHA-1: e2384459777860d6dcb98e9f445cb9905b884947 SHA-256: 6c2e6e535cd3bce1a1dc8b4aa712c8d4d93dd0754a8955d73edcbb1e5753cbe1
154 Risk Score

Malware Insights

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

The PDF contains a link to a redirector URL that is associated with malicious activity, and it also hosts a large number of other PDF files, suggesting a link farm for SEO manipulation. The document body, though heavily obfuscated, contains keywords related to software downloads and the malicious URL, indicating a lure to trick users into downloading software. The presence of embedded URLs and the ML classifier's high confidence score support the malicious verdict.

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/wix?keyword=adobe+illustrator+10+software+free+download+full+version
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0434/7723/7913/files/dababegi.pdf
    • https://cdn.shopify.com/s/files/1/0435/5224/3861/files/voxajonifipi.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/23342697578.pdf
    • https://cdn.shopify.com/s/files/1/0433/3171/5225/files/cfa_level_2_books.pdf
    • https://cdn.shopify.com/s/files/1/0450/9846/7480/files/comparison_of_equality_exercises_with_answers.pdf
    • https://cdn.shopify.com/s/files/1/0438/9378/4728/files/95904326981.pdf
    • https://cdn.shopify.com/s/files/1/0435/2750/4024/files/fedisowomenuliwekoxujelid.pdf
    • https://cdn.shopify.com/s/files/1/0462/7736/1813/files/sirifatimavivokokefikab.pdf
    • https://cdn.shopify.com/s/files/1/0433/6821/8780/files/20468790879.pdf
    • https://cdn.shopify.com/s/files/1/0433/6658/0382/files/carrie_the_cargiver.pdf
    • https://cdn.shopify.com/s/files/1/0431/0394/4853/files/bd_facsverse_filter_guide.pdf
    • https://cdn.shopify.com/s/files/1/0434/3654/0069/files/pigomuviv.pdf
    • https://static.usrfiles.com/ugd/b8c837_b4e5cb02f64a4c29929b5ac1cba43dae.pdf
    • https://static.usrfiles.com/ugd/b8c837_d34207c01fbf4fe7bd429f977bf8b467.pdf
    • https://static.usrfiles.com/ugd/b8c837_356eaac9d8654425a136f3fe050ab2d3.pdf
    • https://static.usrfiles.com/ugd/b8c837_64a5360b754243ffa1bec505528476f8.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_off000068bf.bin
b5142447fa72f98f5193cd9bb3594c048c3cfdd498bcdab93efa77a8c0a99c33		 pdf-font-stream PDF embedded font (sfnt) at offset 0x68BF 5376 bytes
font_01_sfnt_off00007b27.bin
6dba68f619207845a02b814860a8ea1b151a1ff2046b0777b8d633df45513a02		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7B27 10608 bytes

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