Malicious PDF — malware analysis report

Static analysis result for SHA-256 4737e9c99ed175b2…

MALICIOUS

PDF

44.0 KB Created: 2020-07-08 16:14:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2020-09-04
MD5: d2d621523754d4fdd6806bfa7b6b9021 SHA-1: 777ba4684ce699b2f8ab8fefc602dffdb178c9d5 SHA-256: 4737e9c99ed175b276fdfe9592a1735bdd3fb4d1f4acf45d1d876a3326795ae6
244 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, directing users to 'ttraff.cc'. Additionally, it features a large number of embedded links to external PDF files, a common tactic for SEO poisoning and driving traffic to malicious sites. The ClamAV detection and ML classifier further confirm its malicious nature. The document body is heavily obfuscated but contains the redirector URL.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 6

  • ClamAV: Pdf.Dropper.Agent-8920571-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Dropper.Agent-8920571-0
  • 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.
  • 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=the+greatest+love+of+all+lyrics+pdf In PDF document text
    • http://files.bbsimon.com/uploads/1/3/2/6/132682570/tudijimavu.pdfIn PDF document text
    • http://files.patmcculloughart.com/uploads/1/3/1/3/131380953/9532063.pdfIn PDF document text
    • http://files.artlynchactingcoach.com/uploads/1/3/1/3/131380868/tagaxe.pdfIn PDF document text
    • http://files.gtc-elite.org/uploads/1/3/2/6/132682570/netefikuvuboz_fifajog_jubakafa.pdfIn PDF document text
    • http://files.tayloraugustine.com/uploads/1/3/1/3/131379290/gulutizigoji.pdfIn PDF document text
    • http://files.asacottrelldar.org/uploads/1/3/1/3/131398066/29d3d713096556f.pdfIn PDF document text
    • http://files.gsradionj.com/uploads/1/3/0/8/130873895/wukoluvajivugikus.pdfIn PDF document text
    • http://files.zanyunoodles.com/uploads/1/3/0/7/130739381/sikete-wemotuta.pdfIn PDF document text
    • http://files.nyicnamatrimonial.com/uploads/1/3/2/6/132683088/83545a5f.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://badupubasa.files.wordpress.com/2020/06/wominuvuzopumezenam.pdfIn PDF document text
    • https://rojapeb.files.wordpress.com/2020/07/95481126385.pdfIn PDF document text
    • https://vajowobago.files.wordpress.com/2020/06/fotokinizunuzubekiwipeve.pdfIn PDF document text
    • https://muxizesuja.files.wordpress.com/2020/07/navupigax.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/dadimutixiwukigojubiw.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/23535065851.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/zeranosorijajigafa.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006f55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6F55 5208 bytes
SHA-256: 717af084b364091dd651d7127c8f407860532d40a8ce002fdf2f8a34d31c544d
font_01_sfnt_off00008133.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8133 9916 bytes
SHA-256: 5a39477ee57512e1dbb62b08bd69464a734b6e6f378ababe5bc20f5677847624

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