Malicious PDF — malware analysis report

Static analysis result for SHA-256 611c28c6e0d86a40…

MALICIOUS

PDF

49.8 KB Created: 2020-09-06 12:44:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0b81a7a30f193f7525e8512f55d50b1b SHA-1: e5011eca1fa04a8f6f0b308d12a558a0ba8486db SHA-256: 611c28c6e0d86a400250992ec0ff279c565439c1746d15ff36dd3574de885aa7
154 Risk Score

Malware Insights

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

The PDF contains embedded links that lead to a redirector URL, which is flagged as malicious. The document body, though heavily obfuscated, contains the same malicious URL and other benign-looking PDF links, suggesting a link farm or redirection tactic. The ML classifier also strongly indicated maliciousness.

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.club/wix?keyword=historically+informed+performance+baroque+music
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/b6bf5b_d31036e5ac0440b8ac709849bc43ef84.pdf
    • https://static.usrfiles.com/ugd/b8c837_94ebdc909c7447589fc4695df380f5fd.pdf
    • https://static.usrfiles.com/ugd/a43ec6_c6bdb236ca904f3ab52cdc26094f7903.pdf
    • https://static.usrfiles.com/ugd/f523c3_d6ac30a65360412fa961dcf9ac57dccf.pdf
    • https://static.usrfiles.com/ugd/f6336d_ff1e880bc46c4c088c7911a7f23d86f9.pdf
    • https://static.usrfiles.com/ugd/b7082a_52fa306887f54551a52c0168d5e6fffe.pdf
    • https://cdn.shopify.com/s/files/1/0431/0410/8711/files/taxizurafoturiboru.pdf
    • https://cdn.shopify.com/s/files/1/0431/8547/1656/files/zefebejuxo.pdf
    • https://cdn.shopify.com/s/files/1/0430/9801/3845/files/personal_financial_statement_fillable.pdf
    • https://cdn.shopify.com/s/files/1/0427/6623/7852/files/vemavizuneruvivitudu.pdf
    • https://cdn.shopify.com/s/files/1/0437/2830/6341/files/meiosis_phase_worksheet_answer_key.pdf
    • https://cdn.shopify.com/s/files/1/0439/9444/8030/files/zokagorope.pdf
    • https://cdn.shopify.com/s/files/1/0429/8211/3433/files/54795220242.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_off00008387.bin
f5c643dae7a1f41dcb36fd940a61236dbf56fe9b0dc667356e7f1ba8fe0a4a22
pdf-font-stream PDF embedded font (sfnt) at offset 0x8387 5632 bytes
font_01_sfnt_off00009697.bin
3f3d7776a182209ff2c6b131d10c3564fd12eaefb380722d1f7c3383d94d936b
pdf-font-stream PDF embedded font (sfnt) at offset 0x9697 10316 bytes