Malicious PDF — malware analysis report

Static analysis result for SHA-256 b0d36272f98f613d…

MALICIOUS

PDF

41.6 KB Created: 2020-08-24 20:53:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cd1ac11ce5bc9e23ed80538039c0d022 SHA-1: c87889c149d67b15f07a3fed7b39d3f00364e21b SHA-256: b0d36272f98f613d7fc1164763c715a3f0c91cad90531b9ef5c4f2c24043a90e
152 Risk Score

Malware Insights

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

The PDF contains a link farm of numerous PDF files, with the primary link directing to a known malicious redirector. The ML classifier strongly indicated maliciousness. The document body itself is heavily obfuscated but contains the primary malicious URL, suggesting the intent is to redirect the user to malicious content.

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.com/pify?keyword=akhiyan+ne+goli+maar+diya+song
    • http://files.tynksgemstonedesigns.com/uploads/1/3/2/7/132710665/bufonakenebexoge.pdf
    • http://files.northsideenginecompany.org/uploads/1/3/0/8/130874433/volagiwas-dixoge-zirutazunavi-gefaxi.pdf
    • http://kozuv.landtoseasurvival.co.uk/uploads/1/3/1/8/131856124/fejogun.pdf
    • http://files.ashleylarnold.com/uploads/1/3/0/9/130969172/tolamilekopi.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/tunamowari.pdf
    • https://cdn.shopify.com/s/files/1/0448/4448/2717/files/sheet_metal_cladding_factories.pdf
    • https://cdn.shopify.com/s/files/1/0463/2736/5789/files/92599301906.pdf
    • https://cdn.shopify.com/s/files/1/0440/7482/7941/files/texapexaxur.pdf
    • https://cdn.shopify.com/s/files/1/0430/0223/2983/files/juwiwile.pdf
    • https://cdn.shopify.com/s/files/1/0433/2408/0282/files/balimapo.pdf
    • https://cdn.shopify.com/s/files/1/0436/5195/6894/files/alfabeto_japones_kanji_completo.pdf
    • https://cdn.shopify.com/s/files/1/0431/5122/9089/files/77467997412.pdf
    • https://cdn.shopify.com/s/files/1/0431/6204/2529/files/bevacizumab_side_effects.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005029.bin
b591f1118aa810a8a8ea38fb01c27486ce199dcae8b254b28eaa16ab945df9a8
pdf-font-stream PDF embedded font (sfnt) at offset 0x5029 5396 bytes
font_01_sfnt_off00006251.bin
fad92c447d9a3bd7bff2ff1ec0c1fe02b9d376080991808bfef72aee8e28930a
pdf-font-stream PDF embedded font (sfnt) at offset 0x6251 9936 bytes
font_02_sfnt_off00008490.bin
794d8cc090a449e0d460036171b2d5b2c749cb0dc3f17972c44626ada68ee3d8
pdf-font-stream PDF embedded font (sfnt) at offset 0x8490 16168 bytes