Malicious PDF — malware analysis report

Static analysis result for SHA-256 449637adf33b712c…

MALICIOUS

PDF

42.9 KB Created: 2020-09-01 14:51:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 19dc2423bb5b9b34c3b8189eb290ac47 SHA-1: c7560233073d40eb2cd1e52587d362b1c0d6eab2 SHA-256: 449637adf33b712c78fd1f95363e62a1965f38fbe0a8908e1c196d8f8c5f3bee
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to a redirector service. The heuristic 'PDF_SEO_LINK_FARM' indicates a mass external PDF link farm, and 'PDF_MALICIOUS_REDIRECTOR_LINK' confirms that at least one of these links leads to known malicious infrastructure. The ML classifier also strongly indicated maliciousness. The document body contains the malicious URL, suggesting an attempt to lure users to malicious 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.link/pify?keyword=bloatware+android+l%25C3%25A0+g%25C3%25AC In PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://static.usrfiles.com/ugd/808d8c_c411f0428a2c4bb98a0bfa86c8e8e04f.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/696b8a_88b5c9994b2149b4b6f54dce612cf673.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/2ca09c_007fb2715ee84a52b64fcd55cb07d846.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/b910ae_cb9811dca1f746779a90eae3f9fc3d9e.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/b8c837_290324ef6a014476a21a3c596d73df96.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/7f16bd_20f3264af4514dd88540b1237a16c748.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/eda9ba_a4910fab84dd454bb4ee76b2ce84ef7f.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/10b11f_506dfeb65b6440cd9bfbc35781b6b41b.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/d775a9_c5a387cc17d948bb834a766ef380aab3.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/cb2bed_126fde826ae04064b487d30d242ac59c.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/b8c837_c95039a698aa4e1893100847d4e8a3c6.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/33a2e4_2c404f80b5424d2d8b4f3144fa92fe8b.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/20d83a_44caccae127940a0ae5de01c0deab914.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006850.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6850 5244 bytes
SHA-256: 5e0b2d951f6ade9def466422e876e7fcee7f3e67f01dcc55f594763ba485fa49
font_01_sfnt_off000079b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x79B4 10496 bytes
SHA-256: 418528fcbe4e8f05d3137d04a2edf2f395f7b33ce317fc61aa2c207a32bd1ba8

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