Malicious PDF — malware analysis report

Static analysis result for SHA-256 f46c1347df6b5121…

MALICIOUS

PDF

38.4 KB Created: 2020-07-31 13:45:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2023f581ff4ca3b515bfe3f3416f7212 SHA-1: 7ea7e38e7bf959a7786e457536dbdeb6c15e42f1 SHA-256: f46c1347df6b5121bd4b09169ee4f93579488ca790c14309ac8e3f7335baaf57
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains numerous embedded links, with one specifically pointing to a known malicious redirector. The ML classifier strongly indicates maliciousness. The document body, though heavily obfuscated, appears to be related to the URL's keyword. The primary attack vector is the redirection to malicious infrastructure, likely for phishing or to download further payloads.

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/pify?keyword=corazon+de+un+ni%25C3%25B1o+pdf
    • http://files.jameschristianimagery.com/uploads/1/3/2/6/132695519/wezogedakanijep_xuzofosegi_bumilonoxuwimi_dujedi.pdf
    • http://files.cliftonvale.com/uploads/1/3/1/4/131452938/573712.pdf
    • http://files.cheywebb.com/uploads/1/3/1/3/131398259/vizake_vuwejerapex_ravarajupita_roruz.pdf
    • http://files.thebravehouse.com/uploads/1/3/1/3/131380397/41f5dbbf4a4e7c.pdf
    • http://files.mulvaneystudios.com/uploads/1/3/2/7/132712508/b7773f2.pdf
    • http://files.cheywebb.com/uploads/1/3/1/3/131398259/vi
    • https://cdn.shopify.com/s/files/1/0428/4389/8019/files/16235063718.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/92904811518.pdf
    • https://cdn.shopify.com/s/files/1/0430/1661/8145/files/fegodi.pdf
    • https://cdn.shopify.com/s/files/1/0427/8249/0791/files/sexubibufelewarubofoxuxex.pdf
    • https://cdn.shopify.com/s/files/1/0431/3242/0262/files/72143102205.pdf
    • https://cdn.shopify.com/s/files/1/0431/6427/0743/files/pipapemisolizagedunebotil.pdf
    • https://cdn.shopify.com/s/files/1/0440/6303/1448/files/rawarigodubofutu.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/38692385895.pdf
    • https://cdn.shopify.com/s/files/1/0430/0043/0746/files/babizimaxotopabebuwigutu.pdf
    • https://cdn.shopify.com/s/files/1/0432/1751/8751/files/21513106323.pdf
    • https://cdn.shopify.com/s/files/1/0430/6829/3287/files/domixozikezi.pdf
    • https://cdn.shopify.com/s/files/1/0431/0158/5570/files/vebepul.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005836.bin
f646dfe7ef17398f668a6d02ec9ba9a5ae1b9f2dc899932173a309685e5cedc4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5836 4912 bytes
font_01_sfnt_off000068b3.bin
880c904a8643aee9830e8771d698d188a0ad62d464ccc42ff66a25508eefe26b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x68B3 10392 bytes

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