Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a8aa7e864447706…

MALICIOUS

PDF

54.2 KB Created: 2020-07-08 14:42:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2020-09-24
MD5: 48c95488b19a3130b695afff64b78872 SHA-1: ebb8ee46b8e42756296148151f291b2357cbf47b SHA-256: 1a8aa7e864447706f47e4a12bc0dfa7dc8aef6e50cd2a94ff9906add56498429
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF file contains a large number of embedded links, many of which point to domains hosting numerous other PDF files. One prominent link redirects to a known malicious redirector. This indicates a link farm or SEO poisoning technique designed to lure users to malicious sites. The document body, while containing garbled text, includes the title 'Gunnar myrdal an american dilemma pdf' and the malicious redirector URL, suggesting a lure to disguise the malicious intent.

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.cc/wb?keyword=gunnar%20myrdal%20an%20american%20dilemma%20pdf In PDF document text
    • http://files.therungururelay.com/uploads/1/3/2/3/132302999/kevumidigavimatif.pdfIn PDF document text
    • http://files.crcofwm.org/uploads/1/3/0/7/130738501/lonebuforamu.pdfIn PDF document text
    • http://files.thirdcinemaproductions.com/uploads/1/3/1/3/131379749/sonazez.pdfIn PDF document text
    • http://files.chicagoschoolofgrappling.com/uploads/1/3/1/4/131409170/312064.pdfIn PDF document text
    • http://files.farronengineering.com/uploads/1/3/1/0/131070112/zasoruzibopeku.pdfIn PDF document text
    • http://files.thesilkfamilyproject.com/uploads/1/3/1/4/131437740/livig.pdfIn PDF document text
    • http://files.ovationentertainmentgroup.com/uploads/1/3/1/4/131437648/8675108.pdfIn PDF document text
    • http://files.nod-production.de/uploads/1/3/0/7/130776118/3864674.pdfIn PDF document text
    • http://files.adelaidechickensittingservice.com/uploads/1/3/1/8/131857071/wovakemeluwo-bokevanukapaku.pdfIn PDF document text
    • http://files.henestrosastudio.com/uploads/1/3/1/8/131871677/jezatawowi-jakomusixegepub-kuloxeku-zobuzujexi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://kugigoke149047822.files.wordpress.com/2020/07/37976927540.pdfIn PDF document text
    • https://viveriba.files.wordpress.com/2020/06/guxepoziloxazopowuvoz.pdfIn PDF document text
    • https://lipimuz.files.wordpress.com/2020/06/setomolusezowakivigabeg.pdfIn PDF document text
    • https://tijudemupox.files.wordpress.com/2020/06/mabozu.pdfIn PDF document text
    • https://fatugapep.files.wordpress.com/2020/07/96974180892.pdfIn PDF document text
    • https://zezupid.files.wordpress.com/2020/06/23165583903.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_off0000982d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x982D 4948 bytes
SHA-256: 2738d43a6a8ad271fcca7c45f71d51b3f199aa790309597a503ce1331dcca8bc
font_01_sfnt_off0000a8ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA8EC 10276 bytes
SHA-256: b95b02351efd94b321dbfc44f34dc416f9bb74e469e45559b9e0aef425db535c

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