Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ab44dec27e170ba…

MALICIOUS

PDF

113.4 KB Created: 2020-07-31 05:14:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 817ecb1a385994c0835ca6c6d769c3b0 SHA-1: 78bfe938958caf4d8036aa8ecd59e9af7c69c03d SHA-256: 5ab44dec27e170bae5b091593a2f2c0c066308388a754cab8c821e8d031e4070
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with one identified as a malicious redirector. The ML classifier also flagged this PDF with high confidence. While no scripts were extracted, the presence of numerous links suggests an attempt to lure users to malicious sites, potentially for phishing or malware distribution.

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=cia+triad+pdf
    • http://files.lhec.org/uploads/1/3/2/6/132682235/0a40c5a84c7e85.pdf
    • http://files.kirtansongbook.com/uploads/1/3/2/6/132681295/2914980.pdf
    • http://files.healthtruth.blog/uploads/1/3/1/4/131407010/3eae2ee.pdf
    • http://files.sunshinedentaldds.com/uploads/1/3/0/7/130776183/verekejefejilu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0429/9885/7891/files/tozanisumapojijowusun.pdf
    • https://cdn.shopify.com/s/files/1/0430/5698/8317/files/27714512733.pdf
    • https://cdn.shopify.com/s/files/1/0431/8740/4968/files/wuvupawefafikijozubiwovin.pdf
    • https://cdn.shopify.com/s/files/1/0440/3150/8645/files/wedaminojavejexuk.pdf
    • https://cdn.shopify.com/s/files/1/0430/0197/0837/files/4862253660.pdf
    • https://cdn.shopify.com/s/files/1/0437/3633/4501/files/sotedeliv.pdf
    • https://cdn.shopify.com/s/files/1/0430/8451/3440/files/wepunip.pdf
    • https://cdn.shopify.com/s/files/1/0433/1575/7214/files/tidekipasox.pdf
    • https://cdn.shopify.com/s/files/1/0428/9314/8313/files/jawukegup.pdf
    • https://cdn.shopify.com/s/files/1/0436/9275/3049/files/74391267233.pdf
    • https://cdn.shopify.com/s/files/1/0429/0550/1852/files/ketirasolawusarap.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/45865267400.pdf
    • https://cdn.shopify.com/s/files/1/0430/0118/4417/files/webot.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_off000177e1.bin
022544f3dd7501a3b21d63da16b4f4867a85f7f9f8aab29dcf7dd483a3d3d2fa
pdf-font-stream PDF embedded font (sfnt) at offset 0x177E1 4304 bytes
font_01_sfnt_off0001868d.bin
8f05b411737014227eb6fb6e57ee10977d931875d9d318994a3774d8fc3f78ea
pdf-font-stream PDF embedded font (sfnt) at offset 0x1868D 16116 bytes