Malicious PDF — malware analysis report

Static analysis result for SHA-256 b89e13a88d1a9fa0…

MALICIOUS

PDF

68.2 KB Created: 2020-07-08 23:20:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d3fc0e340f5630fafc52da6c1cef77e4 SHA-1: ade23a5a6ae6858eb6830e909f914268662974c9 SHA-256: b89e13a88d1a9fa06af9428d673d748a98a2c513dfb271c8f5d436d42820f10a
152 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded links, with one specifically pointing to a known malicious redirector. The heuristic 'PDF_SEO_LINK_FARM' indicates a mass of external PDF links, suggesting a link farm or SEO manipulation tactic. The ML classifier also strongly flagged this PDF as malicious. The primary attack pattern involves luring users to click on these links, which likely lead to further malicious content or phishing pages.

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=catalogo%20de%20cuentas%20de%20una%20empresa%20industrial%20ejemplo%20pdf
    • http://files.cozykidsembroidery.com/uploads/1/3/1/4/131409170/ninebafakafekip.pdf
    • http://files.joynesphotography.com/uploads/1/3/2/7/132741181/179067.pdf
    • http://files.creativecounselingsrq.org/uploads/1/3/2/7/132710787/5366484.pdf
    • http://files.lucygrayconsulting.com/uploads/1/3/1/4/131411024/darokusapan_nedajafase_relabobav_jatew.pdf
    • http://files.firstbaptistwaldron.com/uploads/1/3/1/3/131380723/547b9a8.pdf
    • http://files.gretchenjude.com/uploads/1/3/1/4/131456012/8d87997.pdf
    • http://files.donaldunger.com/uploads/1/3/1/4/131410094/nalelegikowe.pdf
    • http://files.billiedepatiedesigns.com/uploads/1/3/0/9/130969809/talenure.pdf
    • http://files.heavenbeckons.com/uploads/1/3/0/7/130739120/f960f6a1795f8.pdf
    • http://files.giuliapieralivi.com/uploads/1/3/0/9/130969986/9b36e704.pdf
    • https://bifixidapo.files.wordpress.com/2020/07/81189617563.pdf
    • https://tatusedujej.files.wordpress.com/2020/06/95066602063.pdf
    • https://wozimupo.files.wordpress.com/2020/06/nagewavipo.pdf
    • https://xomejigukeza.files.wordpress.com/2020/06/kovusadejomasuvowuses.pdf
    • https://diwuvogodun.files.wordpress.com/2020/06/madusapujugeseledegab.pdf
    • https://rilowid.files.wordpress.com/2020/06/88599986709.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/46391305542.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/69296453687.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/meragavafeduxilaxopuxaw.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/xokuwunojuvilil.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/57032902602.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_off0000bad5.bin
83e2c66ac9aafaebb582079f61e1e18dca5539880f96b194115af0c9ffb19ad6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBAD5 5456 bytes
font_01_sfnt_off0000cd52.bin
3d04c5806f3991b5297262798c53b8d0f0dddb720cb894319bca2d87473621cb		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCD52 18180 bytes

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