Malicious PDF — malware analysis report

Static analysis result for SHA-256 298b25902c85a01f…

MALICIOUS

PDF

40.9 KB Created: 2020-07-09 01:39:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2020-09-07
MD5: aa2c874c17be8da7135677014938c88b SHA-1: efc426e865021e0b8334f11ba71f4c6ba5ef29d4 SHA-256: 298b25902c85a01f9b2e118d1b8cc9663a7b6d357bd26dc7db5edd923a8484e0
184 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to external PDF files hosted on various domains, indicating a link farm or redirection strategy. One prominent URL, https://ttraff.ru/wb?keyword=nothing%20is%20impossible%20chords%20key%20of%20e%20pdf, is flagged as a malicious redirector. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.ru/wb?keyword=nothing%20is%20impossible%20chords%20key%20of%20e%20pdf In PDF document text
    • http://files.thecotswoldcollection.net/uploads/1/3/1/4/131437753/kumowoloded.pdfIn PDF document text
    • http://files.honeybeeman.com/uploads/1/3/2/3/132303075/fajapawosuwab_wareb_wigifajodenez_vorozo.pdfIn PDF document text
    • http://files.marinegibert.net/uploads/1/3/1/3/131380953/7630616.pdfIn PDF document text
    • http://files.driver4uiceland.com/uploads/1/3/1/0/131070378/715821.pdfIn PDF document text
    • http://files.nextpromotionalproductsandapparel.com/uploads/1/3/0/8/130814342/vupuwufijiba-furef.pdfIn PDF document text
    • http://files.purpleinkpublishing.com/uploads/1/3/1/4/131437844/mikofoxaxomojope.pdfIn PDF document text
    • http://files.stspain.com/uploads/1/3/0/7/130776575/7eb48.pdfIn PDF document text
    • http://files.bohobyjojo.com/uploads/1/3/1/3/131398164/09eab7e1a15.pdfIn PDF document text
    • http://files.thebetterbrasspipe.com/uploads/1/3/2/7/132740218/daf3e1d8396c143.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://jabaduxus.files.wordpress.com/2020/06/99519541466.pdfIn PDF document text
    • https://pefeledegabo.files.wordpress.com/2020/07/91277822242.pdfIn PDF document text
    • https://gepalozevod.files.wordpress.com/2020/06/revokujolugisip.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/fulefevizurosojasi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/94448736580.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/rosetotirumeza.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/tolipokegegami.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_off000055e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x55E9 5420 bytes
SHA-256: 21003216390aa30fe52a878505ab33e3624e611784c0a20416256916cd6d52df
font_01_sfnt_off00006832.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6832 14856 bytes
SHA-256: d4c8049d0f229010ce7e802610f6b8802321e9a2ce2c7b32ca54048d1d0f8d9a

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