Malicious PDF — malware analysis report

Static analysis result for SHA-256 e4ae3921695bf300…

MALICIOUS

PDF

46.8 KB Created: 2020-09-02 04:08:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f1ab12cd29277418262214cb244e30ab SHA-1: 0248f94cc8e8460681fda30b401a40b7013df2b2 SHA-256: e4ae3921695bf300aafae51c7d35592bdbf5e75fc4ff7ec4957703d0ea4e2e57
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'https://ttraff.me/wix?keyword=amalaki+beneficios+pdf'. Additionally, it exhibits a PDF link farm behavior with numerous external links, including 'https://static.usrfiles.com/ugd/b8c837_901166200ca84c9492832501ae1e2cc4.pdf'. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains the malicious URL and references to 'wkhtmltopdf', suggesting it's a lure document.

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/wix?keyword=amalaki+beneficios+pdf
    • https://static.usrfiles.com/ugd/b8c837_901166200ca84c9492832501ae1e2cc4.pdf
    • https://static.usrfiles.com/ugd/7c1f05_f33c14fc49f64c2da4235480bb2d6182.pdf
    • https://static.usrfiles.com/ugd/93971e_6e35f4cfac614dfc972f980101927afd.pdf
    • https://static.usrfiles.com/ugd/7a11b0_50dfc7eb67bb406bb990e318e1783285.pdf
    • https://static.usrfiles.com/ugd/b8c837_b139f2e832534566ba572c359f306460.pdf
    • https://cdn.shopify.com/s/files/1/0456/5270/5447/files/oracle_cloud_general_ledger_reports.pdf
    • https://cdn.shopify.com/s/files/1/0435/2665/2055/files/85034415923.pdf
    • https://cdn.shopify.com/s/files/1/0435/3123/9588/files/zodojesu.pdf
    • https://cdn.shopify.com/s/files/1/0438/7730/2427/files/car_log_book_template_excel.pdf
    • https://cdn.shopify.com/s/files/1/0428/5356/4583/files/bolly4u_2019_bollywood_movie.pdf
    • https://cdn.shopify.com/s/files/1/0434/3080/5671/files/gezugudikimenawolowamu.pdf
    • https://cdn.shopify.com/s/files/1/0448/2826/2560/files/analytical_skills_notes.pdf
    • https://cdn.shopify.com/s/files/1/0439/8075/1006/files/statistical_analysis_of_network_data_in_r.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/
    • https://static.usrfiles.com/ugd/b8c837_b139f2e832534566ba572c359f306460

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006ca5.bin
852e7a173e134a85cfcfa93f7f1ebb5e6734ddc06ded80f3bcb0b336db7b2069		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6CA5 5104 bytes
font_01_sfnt_off00007dd5.bin
16b5d0c32e86e1eb93dbf0b09ca05814d6c96b5d1ca33fb6028685a7410f60f7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7DD5 10092 bytes
font_02_sfnt_off0000a049.bin
ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA049 4324 bytes

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