Malicious PDF — malware analysis report

Static analysis result for SHA-256 6037a23fb658d70b…

MALICIOUS

PDF

42.0 KB Created: 2020-08-31 08:08:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 55026d4cab769f25e452038b1177f22c SHA-1: 8b173c9a0645a22dddbd367e11b847a2f78ae09e SHA-256: 6037a23fb658d70b363c4884756d3376af2872175e52687be75b3cb1f9caccb3
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, with one heuristic specifically identifying it as a PDF link farm pointing to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains text related to 'Optimum altice one manual' and a URL that aligns with the malicious redirector. This suggests the document is designed to trick users into clicking malicious links, likely leading to further compromise.

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.cc/wix?keyword=optimum+altice+one+manual
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://static.usrfiles.com/ugd/2b25e8_f682463bac0845f1a92af4a4c577709e.pdf
    • https://static.usrfiles.com/ugd/b8c837_38d88a5e05be4ae1b94398722fe55f31.pdf
    • https://static.usrfiles.com/ugd/9b33c5_d1eb3ab273174b4586068937a58907fe.pdf
    • https://static.usrfiles.com/ugd/934fc3_9d8e4e29fb1b4974900e4de0f898c99a.pdf
    • https://cdn.shopify.com/s/files/1/0431/0564/8807/files/pijok.pdf
    • https://cdn.shopify.com/s/files/1/0433/9482/6396/files/lied_ohne_worte_mendelssohn_sheet_music.pdf
    • https://cdn.shopify.com/s/files/1/0434/1514/2551/files/lirasi.pdf
    • https://cdn.shopify.com/s/files/1/0433/2349/0457/files/45010641636.pdf
    • https://cdn.shopify.com/s/files/1/0432/9655/5168/files/antibiotic_sensitivity_test_in_microbiology.pdf
    • https://cdn.shopify.com/s/files/1/0460/3959/7220/files/guided_meditation_for_deep_relaxation_and_positivity.pdf
    • https://static.usrfiles.com/ugd/b8c837_0ec49a0ee4824ad0905838b2e0b8662a.pdf
    • https://static.usrfiles.com/ugd/ab922d_776295c53b1a4827ac4685ce4e94268c.pdf
    • https://static.usrfiles.com/ugd/b8c837_f6f038eb6dce4d23bb1f7da16ae09421.pdf
    • https://static.usrfiles.com/ugd/a8ca0f_3b4000a829a14f2c9a7da3689e6ed526.pdf
    • https://static.usrfiles.com/ugd/b8c837_72ae4956e8f64808af31c29f675bcc92.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005a8e.bin
6898295d12104fa064ba4a98741884c049ba465a99c8d5e25d8b306cad9272cc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5A8E 4716 bytes
font_01_sfnt_off00006a77.bin
78a76e81fbce92bde57bca3bf26eee3ac6e796a4163e1767d3a0ec6d6af1a43e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6A77 10248 bytes
font_02_sfnt_off00008d7b.bin
cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8D7B 4324 bytes

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