Malicious PDF — malware analysis report

Static analysis result for SHA-256 be44d15a5ae823b3…

MALICIOUS

PDF

48.6 KB Created: 2020-09-06 05:39:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f2d3818ae90edf6de60207e14d1e75a1 SHA-1: 84441f24738b371285a8fb21777edad42f64de41 SHA-256: be44d15a5ae823b35c74977fab481dd3e24288519654aedada5236423814a550
152 Risk Score

Malware Insights

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

The PDF file contains a lure related to Excel formatting, directing users to a malicious URL. It also exhibits characteristics of a PDF link farm, embedding numerous links to external PDF files, with the primary malicious redirector being ttraff.me. The ML classifier strongly indicated maliciousness, and the PDF structure suggests an attempt to drive traffic to potentially harmful content.

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=how+to+copy+formatting+in+excel+spreadsheet
    • https://static.usrfiles.com/ugd/cafc24_da4226d13f0d4441895c4aa223d7bfec.pdf
    • https://static.usrfiles.com/ugd/2994dd_e20485925a374dd2801c0504725c43aa.pdf
    • https://static.usrfiles.com/ugd/02af14_8900dcb302e24b289812ea14d5272602.pdf
    • https://static.usrfiles.com/ugd/a107db_cb887ad27f5145b9b25920453184a08c.pdf
    • https://static.usrfiles.com/ugd/b8c837_ed0b716124984bd295055a03a17a085f.pdf
    • https://static.usrfiles.com/ugd/10b11f_5f27ab7f2ec44e39ab54cb20f116e561.pdf
    • https://static.usrfiles.com/ugd/39cb9d_89ea6b3780a9482db5d0efc37fc020e2.pdf
    • https://static.usrfiles.com/ugd/bfbc46_6796ddd432d34179ad4431343a80dc4c.pdf
    • https://static.usrfiles.com/ugd/4bdc6d_b006f9a58ad14afcabc2536b18738bc9.pdf
    • https://static.usrfiles.com/ugd/c618e9_cedd7f29bd204769a38b26b72d5a062f.pdf
    • https://static.usrfiles.com/ugd/ba2c19_97619701af08421abec7dc333a0a1246.pdf
    • https://static.usrfiles.com/ugd/2f8cea_e61ea2f1aab04ed3ab4a2a46b10cf10a.pdf
    • https://static.usrfiles.com/ugd/b8c837_20fe375843044a3baf5c702ce1fd4132.pdf
    • https://static.usrfiles.com/ugd/61804c_6ccc4a28637c400d94df44219ee01a97.pdf
    • https://static.usrfiles.com/ugd/205ae4_bcbf08e77497425d82743cb8e6455536.pdf
    • https://static.usrfiles.com/ugd/60933b_26b9d0bfabc04ff3bf6377c227d5109f.pdf
    • https://static.usrfiles.com/ugd/097bd5_c4a95d034faa4574bd1a06a219890e65.pdf
    • https://static.usrfiles.com/ugd/33a16d_1152fb82ef214a3399df947c1db61d4f.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007132.bin
b105bc269e843f07e8bb9bfcbb96d33078d955fa19c2ce5da397756cf8f283d6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7132 5580 bytes
font_01_sfnt_off0000840f.bin
e8e2dd3bfbb83ad592463af7ddedb32b92b468725c402c2508e524d40023f64a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x840F 10164 bytes
font_02_sfnt_off0000a6e0.bin
9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA6E0 4324 bytes

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