Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c86cc67b2756353…

MALICIOUS

PDF

40.3 KB Created: 2020-08-19 18:53:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3148139ec591d926e3c95ae08bcf4e5b SHA-1: 2d7ddbc072bbe563c6620403092ec356996ff964 SHA-256: 7c86cc67b2756353002ffdcaf17892551d5211ed50bad62da2fd6034e009d360
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 external resources, including a known malicious redirector. The document body itself contains obfuscated text and references to URLs, suggesting an attempt to direct users to malicious sites for further exploitation. The ML classifier strongly indicated maliciousness, supporting the presence of a link farm designed to lead users 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.com/pify?keyword=cerfa+13750+x+05+pdf
    • http://files.swatarachurchofgod.org/uploads/1/3/1/4/131408209/gikajuwa.pdf
    • http://kitanuj.suyana.net/uploads/1/3/1/3/131383483/2308f97.pdf
    • http://zoduwebe.torbaycleaningco.com/uploads/1/3/1/6/131636612/6873696.pdf
    • http://files.metroprointeriors.com/uploads/1/3/1/4/131406104/189450a.pdf
    • http://xujepax.westcenterchurch.org/uploads/1/3/2/7/132740880/lejoz_lateworufi_lunixumesam_xifemidas.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0430/4830/4797/files/open_veins_of_latin_america_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0431/5286/7494/files/tevivuwew.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/31492874922.pdf
    • https://cdn.shopify.com/s/files/1/0447/2619/0234/files/cello_scales_and_arpeggios.pdf
    • https://cdn.shopify.com/s/files/1/0431/2429/3794/files/bharat_acharya_8085_book_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0431/8468/5224/files/vodka_lagake_song_ringtone.pdf
    • https://cdn.shopify.com/s/files/1/0433/3495/9259/files/kunuguvomovef.pdf
    • https://cdn.shopify.com/s/files/1/0432/9373/7110/files/mezizasukumopi.pdf
    • https://cdn.shopify.com/s/files/1/0428/0628/0355/files/zigibejibozolemepexi.pdf
    • https://cdn.shopify.com/s/files/1/0434/5203/9324/files/alone_together_real_book.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_off00005bce.bin
bcc81d7a76b0a01529e6b8049e778948cd0b0a3dbf346be0fc9a515100335e5f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5BCE 5360 bytes
font_01_sfnt_off00006e29.bin
c8e280ef3abc712765c052e8e8765ab6a3397d98a0170f9b9db1926254680345		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6E29 11756 bytes

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