Malicious PDF — malware analysis report

Static analysis result for SHA-256 d9037da1f731cf8c…

MALICIOUS

PDF

43.2 KB Created: 2020-07-08 12:48:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2020-09-24
MD5: 77fbb396632e08dd38aad2beab4402e8 SHA-1: b876ac238b7d309a05674f60f26d99dd1e91fdcc SHA-256: d9037da1f731cf8ca3ecdd3ca33f94cf70db34869b2390c3177b793d7d712b12
192 Risk Score

Malware Insights

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

The PDF contains a link farm and a malicious redirector, indicating a phishing or scam attempt. The document body, though heavily obfuscated, contains a URL that is also present in the heuristics and IOCs. This URL is likely intended to lead the user to download a malicious file or visit a compromised site.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 6

  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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=fastest%20pdf%20reader%20linux In PDF document text
    • http://files.rioxpvista.com/uploads/1/3/1/6/131637034/36c763c9765.pdfIn PDF document text
    • http://files.happycamperllc.com/uploads/1/3/2/3/132302999/ad981ea18b32180.pdfIn PDF document text
    • http://files.mindfulserenityonline.com/uploads/1/3/0/8/130874629/pezozulaleku.pdfIn PDF document text
    • http://files.eimearmcnally.com/uploads/1/3/1/8/131858481/lavolezilagopuvibexi.pdfIn PDF document text
    • http://files.lauriannefiorentino.com/uploads/1/3/1/4/131437445/8414811.pdfIn PDF document text
    • http://files.babysweetpeas.com/uploads/1/3/2/6/132695493/5736847.pdfIn PDF document text
    • http://files.myovisioninfo.com/uploads/1/3/1/4/131452794/258740.pdfIn PDF document text
    • http://files.hornsbyptsa.org/uploads/1/3/1/3/131379434/bomujakurufilo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://lininor.files.wordpress.com/2020/07/ribex.pdfIn PDF document text
    • https://ziziverip.files.wordpress.com/2020/07/voxevawoxesawalapilurele.pdfIn PDF document text
    • https://juvolezo.files.wordpress.com/2020/07/97768135483.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006c5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6C5C 4832 bytes
SHA-256: c88b47bdb827ccb9bb1ad593defe58b8068bca1884caaf3916b19a319900da49
font_01_sfnt_off00007ccd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7CCD 10480 bytes
SHA-256: 0b841d4e4a6bdcfa31273e36ae3fd58b4aa376238e708d4401cce5b9d547f7b0