Malicious PDF — malware analysis report

Static analysis result for SHA-256 0226cebf71cbb14b…

MALICIOUS

PDF

35.6 KB Created: 2020-09-01 11:07:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f87ed23182080d7cd2cfeba033845c39 SHA-1: 057de75488399206b3ec8397a1d9b93be1ded2a4 SHA-256: 0226cebf71cbb14b2e66b5a6254a7ed46c07ba937de45c806bf62a54a0a55cdd
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm with numerous embedded URLs, including one pointing to a known malicious redirector. The document body, though heavily obfuscated, contains the URL for the redirector and several other benign-looking Shopify links, suggesting a lure to a malicious site. The ML classifier strongly flagged this PDF as malicious.

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.me/pify?keyword=album+cover+art+maker
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0440/0388/5214/files/89580865017.pdf
    • https://cdn.shopify.com/s/files/1/0433/0261/7252/files/analog_efex_pro_2_presets.pdf
    • https://cdn.shopify.com/s/files/1/0434/2782/3778/files/33009034188.pdf
    • https://cdn.shopify.com/s/files/1/0436/7423/9129/files/42201307160.pdf
    • https://cdn.shopify.com/s/files/1/0435/0446/8134/files/88819125029.pdf
    • https://cdn.shopify.com/s/files/1/0435/1882/0511/files/90729208818.pdf
    • https://cdn.shopify.com/s/files/1/0433/1926/3397/files/nidujuxomizalorezekiteg.pdf
    • https://cdn.shopify.com/s/files/1/0429/6844/9180/files/76339598183.pdf
    • https://cdn.shopify.com/s/files/1/0430/5872/5018/files/cb_edit_background_hd_pic.pdf
    • https://cdn.shopify.com/s/files/1/0430/1602/8309/files/36773502216.pdf
    • https://cdn.shopify.com/s/files/1/0462/7870/5312/files/93741157641.pdf
    • https://static.usrfiles.com/ugd/ea2f88_a098cac393794f7091491e76dd3851e3.pdf
    • https://static.usrfiles.com/ugd/3b7182_4a1e1e83fb5b496fa773d638493059bb.pdf
    • https://static.usrfiles.com/ugd/173616_5adea7dfad5d49588f5ddf46714d6a42.pdf
    • https://static.usrfiles.com/ugd/d7ba0f_9efe6023ca3d4d48b20a32f394f180de.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_off00004f6e.bin
ebc1fd060e74bc15c7a17fc5403d9d076a79b0d356e3ccea070bbf62df8864df
pdf-font-stream PDF embedded font (sfnt) at offset 0x4F6E 5020 bytes
font_01_sfnt_off00006074.bin
4f1c19c33101307678da49f74b187c59a9604911f6caac23075bd529ae7d585f
pdf-font-stream PDF embedded font (sfnt) at offset 0x6074 9896 bytes