Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5340ba9646f49b3…

MALICIOUS

PDF

53.0 KB Created: 2020-07-07 11:07:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2020-09-15
MD5: af99ac5956973ad1f5d234cb53f81684 SHA-1: 8452477ce1c483041966516ca5778841a39e267f SHA-256: a5340ba9646f49b3014ede04b131789fb263597345669b28a553ae961468045c
184 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, disguised within content related to educational worksheets. The ML classifier strongly indicated maliciousness. The document body, though obfuscated, contains the target URL and numerous other URLs pointing to PDF files, suggesting a link farm or redirection strategy. The primary malicious link is https://ttraff.com/wb?keyword=multiplying%20fractions%20word%20problems%20worksheet%206th%20grade#multiplying+fractions+word+problems+worksheet+6th+grade.

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.com/wb?keyword=multiplying%20fractions%20word%20problems%20worksheet%206th%20grade#multiplying+fractions+word+problems+worksheet+6th+grade In PDF document text
    • http://files.sydneynewhorizons.org/uploads/1/3/2/7/132710787/lozaratorepu_tatira.pdfIn PDF document text
    • http://files.brushandbranch.co/uploads/1/3/0/7/130740344/2297158.pdfIn PDF document text
    • http://files.antoniodavidsinopoli.com/uploads/1/3/0/8/130873907/4090271.pdfIn PDF document text
    • http://files.misfitcrusaders.com/uploads/1/3/0/8/130814672/634f8e.pdfIn PDF document text
    • http://files.bluenosewoodworks.com/uploads/1/3/2/8/132815961/somokirolurujewikusi.pdfIn PDF document text
    • http://files.haralsoncountyhistory.com/uploads/1/3/2/3/132302913/4438840.pdfIn PDF document text
    • http://files.sopoochtraining.com/uploads/1/3/2/8/132815961/kawivibugakovuj.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://xakevotakumo.files.wordpress.com/2020/07/43655335298.pdfIn PDF document text
    • https://vesavijaba.files.wordpress.com/2020/07/675673566.pdfIn PDF document text
    • https://febisixutewo.files.wordpress.com/2020/06/65137408420.pdfIn PDF document text
    • https://kuwezara.files.wordpress.com/2020/06/libaselidalovupos.pdfIn PDF document text
    • https://bimibalosoj.files.wordpress.com/2020/06/64896616155.pdfIn PDF document text
    • https://sosasifen.files.wordpress.com/2020/06/39427615459.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Related samples 8

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

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007432.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7432 6008 bytes
SHA-256: 2b866930834d659b0b37ed2cd7ef62be095c88cdcaba4b191b7be88a3def0999
font_01_sfnt_off00008888.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8888 10812 bytes
SHA-256: 1c8bd0d9886245e371315d428e7eb80ef8034768cb8e8c876ca9bea45e436100
font_02_sfnt_off0000adc2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xADC2 17096 bytes
SHA-256: 09c469605dfb41dd3100a83aa8ebac5e67555267ad4f5be8f0e5856baeb481ea

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