Malicious PDF — malware analysis report

Static analysis result for SHA-256 11e59bfc98844f06…

MALICIOUS

PDF

32.6 KB Created: 2020-08-24 02:41:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 20b854b11e264315b3e02c31bdfd7fb2 SHA-1: ae44415e07d3eb9f53bc7fc6c4f45b1a4c742c47 SHA-256: 11e59bfc98844f0639cb94edf2f476993c12f8747f6dc5e1422c3657bda33a2a
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to potentially malicious redirector infrastructure. The heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' specifically flags a URL leading to 'ttraff.ru', indicating a likely attempt to lure users to malicious sites. The ML classifier also strongly indicated 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.ru/pify?keyword=surat+bakra+video
    • http://files.feng-ge.net/uploads/1/3/1/0/131070207/4cc6e9684a2e.pdf
    • http://files.crystallinevelvet.com/uploads/1/3/0/7/130775292/7a3372f25511b11.pdf
    • http://files.rampollaenterprises.com/uploads/1/3/1/8/131857421/resoselip_sitinemewibuwif_tufopuxorimup.pdf
    • http://files.tailwaggintreats.net/uploads/1/3/2/3/132302819/zunono-jejepewuxaz-gizagupegujef-ganaro.pdf
    • http://files.caribbeanpowdercoating.com/uploads/1/3/0/7/130776114/xufutinelofixez.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0464/6076/4312/files/84927063605.pdf
    • https://cdn.shopify.com/s/files/1/0433/4272/5275/files/aadhar_card_online_download_gujarat.pdf
    • https://cdn.shopify.com/s/files/1/0432/3350/9535/files/5748615596.pdf
    • https://cdn.shopify.com/s/files/1/0435/8628/9832/files/hospital_management_system_admin_template_free.pdf
    • https://cdn.shopify.com/s/files/1/0438/3630/9666/files/77362978652.pdf
    • https://cdn.shopify.com/s/files/1/0437/5799/4142/files/blog_de_libros_romanticos_adultos_gratis.pdf
    • https://cdn.shopify.com/s/files/1/0431/5804/4828/files/12051006676.pdf
    • https://cdn.shopify.com/s/files/1/0447/5686/1077/files/career_paths_art_design.pdf
    • https://cdn.shopify.com/s/files/1/0437/4586/9985/files/63272937800.pdf
    • https://cdn.shopify.com/s/files/1/0428/2312/3100/files/79356002938.pdf
    • https://cdn.shopify.com/s/files/1/0438/2906/7933/files/72941452891.pdf
    • https://cdn.shopify.com/s/files/1/0432/0110/1985/files/wodexojofikodam.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_off00004517.bin
f3637b3716f2becf448a25f6027b4f52aa9075e813cd73bab84176e0c59cc090		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4517 4976 bytes
font_01_sfnt_off00005614.bin
026c35ad1b0dae71f438d79f38a0618bc4e18cb2f4edc93e66ae32dd45b60b68		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5614 9300 bytes

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