Malicious PDF — malware analysis report

Static analysis result for SHA-256 d649b1d947c9c612…

MALICIOUS

PDF

44.6 KB Created: 2020-07-25 14:08:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 31cad1a735e42c630b29c1ffb1f4b46b SHA-1: 795d017e9aa11278202421a39c91f2af08fc878e SHA-256: d649b1d947c9c6128fc2a26362a4d4e1998e1c933c664df9063ec2cb375d98fa
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF file contains a large number of embedded links, many of which point to a link farm hosted on cdn.shopify.com, and one critical link to a known malicious redirector at ttraff.ru. The document body, though heavily obfuscated, suggests a lure related to educational content ('Worksheet on interjection for grade 5'). The ML classifier strongly indicates maliciousness, supporting the interpretation that this PDF is designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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.
  • 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/pify?keyword=worksheet+on+interjection+for+grade+5
    • http://files.visualresearchnetwork.co.uk/uploads/1/3/0/9/130969572/8a41c.pdf
    • http://files.bankerchiropractic.com/uploads/1/3/1/1/131163777/bejovaxulelox.pdf
    • http://files.hulainarizona.com/uploads/1/3/2/8/132814364/kajiterura_vivuxutosalo.pdf
    • http://files.kocyener.com/uploads/1/3/2/8/132815791/8119781.pdf
    • http://files.michaelbigelowdixon.com/uploads/1/3/1/0/131071240/jubuj.pdf
    • http://files.michaelbigelowdixon.com/uploads/1/3/1/0/131071240/jubuj.p
    • https://cdn.shopify.com/s/files/1/0431/0892/5602/files/xujugas.pdf
    • https://cdn.shopify.com/s/files/1/0430/7235/6514/files/neterozu.pdf
    • https://cdn.shopify.com/s/files/1/0432/0142/9662/files/9519337759.pdf
    • https://cdn.shopify.com/s/files/1/0432/1017/8717/files/gaxenibitulefojegobare.pdf
    • https://cdn.shopify.com/s/files/1/0428/9875/1641/files/40718099563.pdf
    • https://cdn.shopify.com/s/files/1/0431/3425/5258/files/wejimi.pdf
    • https://cdn.shopify.com/s/files/1/0431/6640/0673/files/bosel.pdf
    • https://cdn.shopify.com/s/files/1/0431/7141/4173/files/lozasidazilunelatidad.pdf
    • https://cdn.shopify.com/s/files/1/0428/6690/1148/files/wukamakikawog.pdf
    • https://cdn.shopify.com/s/files/1/0434/4722/2422/files/zipolivulevufafusomilonuj.pdf
    • https://cdn.shopify.com/s/files/1/0435/6974/1983/files/ledoniweve.pdf
    • https://cdn.shopify.com/s/files/1/0430/4227/5485/files/tanosodesuxuwifesasapegit.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000703b.bin
88309a8313d61fe3d0a185745116ba265d38c9cafdf5d31d1773fef7e9215228		 pdf-font-stream PDF embedded font (sfnt) at offset 0x703B 5316 bytes
font_01_sfnt_off0000825f.bin
5dafbb42309d6a9a5770bb549089b30596ce9e8fb0fca35b69caf2c6465b57d0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x825F 10280 bytes

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