Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d3721798fe19b37…

MALICIOUS

PDF

53.6 KB Created: 2020-07-13 04:52:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c163eeeb1d6787f066974cef10d21191 SHA-1: c9493bbcd9671c507d96e8c145253b6ae60f5a06 SHA-256: 5d3721798fe19b37a81a0cf1aae936887cdb248c4664a78b0f421ab02f549b76
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one specifically pointing to a known malicious redirector. The document body, though heavily obfuscated, suggests a lure related to 'Hydroelectric power plant in tamilnadu pdf'. The ML classifier strongly indicated maliciousness, and the presence of a link farm heuristic further supports a malicious intent, likely for SEO spam or phishing.

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/wb?keyword=hydroelectric%20power%20plant%20in%20tamilnadu%20pdf
    • http://files.neonopen.org/uploads/1/3/2/6/132682293/dc75c.pdf
    • http://files.djhinton.com/uploads/1/3/0/7/130739093/c3346ee6.pdf
    • http://files.centralfloridabirth.com/uploads/1/3/1/4/131453256/lemunijepoxevogaxum.pdf
    • http://files.carolinastormhedgehogs.com/uploads/1/3/1/6/131637291/fanipewonosewagafuv.pdf
    • http://files.opiumdreamestate.com/uploads/1/3/1/8/131871651/konenuvosan-farulekux-wadipiwofuf.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0429/5173/7498/files/popovulutiwixewem.pdf
    • https://cdn.shopify.com/s/files/1/0429/9826/8065/files/66845012157.pdf
    • https://cdn.shopify.com/s/files/1/0432/1506/1153/files/wenojewuzodosanijit.pdf
    • https://cdn.shopify.com/s/files/1/0433/9751/3381/files/71984925804.pdf
    • https://pafezobikata.files.wordpress.com/2020/07/95652945746.pdf
    • https://sazugakefibu.files.wordpress.com/2020/07/10721918181.pdf
    • https://feximudaza.files.wordpress.com/2020/07/98846643348.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/kilezibuvi.pdf
    • https://cdn.shopify.com/s/files/1/0430/7599/3764/files/1517029203.pdf
    • https://cdn.shopify.com/s/files/1/0432/0555/8436/files/bowaxeve.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/fixasitisajixumazurezeve.pdf
    • https://cdn.shopify.com/s/files/1/0432/8076/0990/files/ginidusilukenukepuzara.pdf
    • https://cdn.shopify.com/s/files/1/0433/5537/3720/files/susowizanuvaz.pdf
    • https://cdn.shopify.com/s/files/1/0433/4996/6998/files/mabofukigetufudolipu.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_off00009525.bin
99bdd0cd825d3372b5f1ac4b2e69394807d5b6f6fa0ca316dcd04351de1264f4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9525 5160 bytes
font_01_sfnt_off0000a6a6.bin
5b402321beeb172421189c5769f7f7f651f2712791ba5bbfc5270c5c34ca9f3b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA6A6 10056 bytes

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