Malicious PDF — malware analysis report

Static analysis result for SHA-256 5dc47a7d954ea441…

MALICIOUS

PDF

67.5 KB Created: 2020-08-29 06:14:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1263604b6ce722d448896ddbbcedff4d SHA-1: a997e332484dc36ccd5c7b5ebdab0fbf4a01d661 SHA-256: 5dc47a7d954ea4418fd1821783031bf768bc34dbb226ea270f7b07836fa0d083
154 Risk Score

Malware Insights

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

The PDF contains embedded links that redirect to a malicious URL, identified by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body, though heavily obfuscated, contains the same malicious URL. The PDF_SEO_LINK_FARM heuristic indicates a large number of outbound links, suggesting a link farm or spamming operation. The ML classifier also strongly indicates maliciousness.

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=angry+video+game+nerd+bugs+bunny
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/7754/1787/files/nuzavebon.pdf
    • https://cdn.shopify.com/s/files/1/0434/2012/3285/files/tanetorasakumumukunemaju.pdf
    • https://cdn.shopify.com/s/files/1/0430/3526/3138/files/ravemulemivumanuredesefu.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/15900382268.pdf
    • https://cdn.shopify.com/s/files/1/0434/5508/6742/files/catalogo_redutor_cestari.pdf
    • https://cdn.shopify.com/s/files/1/0430/1311/1961/files/ledegosedik.pdf
    • https://cdn.shopify.com/s/files/1/0431/3448/4648/files/bronkopneumonia_idai.pdf
    • https://static.usrfiles.com/ugd/b8c837_dc521717ca6b4144b1c2522fc09c90ae.pdf
    • https://static.usrfiles.com/ugd/b8c837_63aad2c1a8234b43a7d25d63c193b7e7.pdf
    • https://static.usrfiles.com/ugd/b8c837_25beb671618b403b992059cf798ef18c.pdf
    • https://static.usrfiles.com/ugd/b8c837_a0fd6ca95ad748b29772bbf24b52a278.pdf
    • https://static.usrfiles.com/ugd/b8c837_38247e5847b243f88e3bcc3b10585cce.pdf
    • https://cdn.shopify.com/s/files/1/0432/4986/0765/files/16474250062.pdf
    • https://cdn.shopify.com/s/files/1/0433/4387/2153/files/vidmate_er_2019.pdf
    • https://cdn.shopify.com/s/files/1/0434/0544/3237/files/96175762150.pdf
    • https://cdn.shopify.com/s/files/1/0434/4614/1093/files/98607314082.pdf
    • https://cdn.shopify.com/s/files/1/0434/5528/3366/files/38993610649.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_off0000baa9.bin
307a28eb5b3c8406c2522686935780b256971e7e8bfbfcaedfdfc736b8ee9d19		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBAA9 5404 bytes
font_01_sfnt_off0000ccef.bin
a727e22f13fe09abaeebc8e07bd582311e346d9c32aa9a62cff61c3dfb147c26		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCCEF 17164 bytes

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