Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ac2412fc52184ae…

MALICIOUS

PDF

37.8 KB Created: 2020-08-26 09:58:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fbf789e783b9c19297b86d0ad64f6fa9 SHA-1: d68e71b544ff3c6d1922ced7daae634ba5ec10c4 SHA-256: 8ac2412fc52184ae0e49701a7c78c67c9e63447d47d4358b795ed382bd7ab5c4
152 Risk Score

Malware Insights

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

The PDF was flagged as malicious by a machine learning classifier and contains a critical heuristic indicating it links to known malicious redirector infrastructure. Additionally, it exhibits a PDF link farm, with numerous embedded URLs pointing to various domains, including shopify.com and other potentially suspicious hosts. The document body is heavily obfuscated and contains a URL that appears to be part of the link farm.

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=stibus+horaire+au+poteau
    • http://files.pamperedpetsbda.com/uploads/1/3/1/4/131453124/kobamug.pdf
    • http://letumiv.greatclactonjunior.com/uploads/1/3/0/9/130969744/bf712baaec.pdf
    • http://relopag.woohoophysics.com/uploads/1/3/0/7/130738962/kodajedibez.pdf
    • https://cdn.shopify.com/s/files/1/0447/3035/1770/files/hernia_epigastrica_congenita.pdf
    • https://cdn.shopify.com/s/files/1/0430/7111/1330/files/97980218316.pdf
    • https://cdn.shopify.com/s/files/1/0428/4389/8019/files/22519620152.pdf
    • https://cdn.shopify.com/s/files/1/0430/8857/6673/files/build_helper_maven_plugin.pdf
    • https://cdn.shopify.com/s/files/1/0434/5564/3813/files/benutazefegunuza.pdf
    • https://cdn.shopify.com/s/files/1/0430/8851/1130/files/48212446140.pdf
    • https://cdn.shopify.com/s/files/1/0435/9123/7791/files/80240982662.pdf
    • https://cdn.shopify.com/s/files/1/0434/3706/4348/files/awakened_house_of_night.pdf
    • https://cdn.shopify.com/s/files/1/0436/9888/0680/files/49787449874.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_off00005315.bin
b07ba469b0c8f0ef8e53477999f605bb97ce1d2a0661f8557f1529d29c6ec823
pdf-font-stream PDF embedded font (sfnt) at offset 0x5315 5120 bytes
font_01_sfnt_off00006466.bin
9d4e005889b386d760ce9bc2a830faf1fbd97a43531bef973fb9e12a011a25bc
pdf-font-stream PDF embedded font (sfnt) at offset 0x6466 11740 bytes