Malicious PDF — malware analysis report

Static analysis result for SHA-256 57841c9f6e752a79…

MALICIOUS

PDF

55.0 KB Created: 2020-08-16 15:08:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d4d3f7f949dbe4431e745df6914015cf SHA-1: d8b7cd00562f55586fede0d84e2cea6ecfa77320 SHA-256: 57841c9f6e752a795d261aafcb653a07667f34808e25bb541e16846575466475
152 Risk Score

Malware Insights

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

The PDF file contains a mass external PDF link farm, with one prominent link pointing to a known malicious redirector. The document body, though heavily obfuscated, contains the URL 'https://ttraff.ru/pify?keyword=piano+notes+cheat+sheet', which is also flagged by heuristics as a malicious redirector. This suggests the document is designed to trick users into clicking the link under the guise of accessing a cheat sheet, leading them to malicious infrastructure.

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=piano+notes+cheat+sheet
    • http://gored.allensonarmory.com/uploads/1/3/2/6/132682233/1268394.pdf
    • http://files.paulinedodd.com/uploads/1/3/0/7/130775021/sonokorap-vitugefufike-zezeko-wuviwe.pdf
    • http://kejolagiw.philadelphiaeritreanchurch.com/uploads/1/3/0/7/130739935/ef19a481a1f5bb7.pdf
    • http://files.lovingthestart.com/uploads/1/3/2/7/132712093/509171.pdf
    • http://files.iboc.com.au/uploads/1/3/2/7/132740701/xonexo.pdf
    • https://cdn.shopify.com/s/files/1/0429/6769/5523/files/kokidatuzapeloxezokusokug.pdf
    • https://cdn.shopify.com/s/files/1/0433/2843/8427/files/kibedaxib.pdf
    • https://cdn.shopify.com/s/files/1/0450/0937/1286/files/libro_cabala_para_principiantes.pdf
    • https://cdn.shopify.com/s/files/1/0434/7320/7446/files/asap_mob_lord_never_worry.pdf
    • https://cdn.shopify.com/s/files/1/0431/7567/4012/files/25536063759.pdf
    • https://cdn.shopify.com/s/files/1/0435/6997/1363/files/85348439097.pdf
    • https://cdn.shopify.com/s/files/1/0427/8976/5279/files/samabutikoto.pdf
    • https://cdn.shopify.com/s/files/1/0449/2158/5831/files/general_wave_equation.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/tinoled.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_off000086ab.bin
7da22b35ec9b7eac198ba0295574023e82dbc8401769a4fcc3a9ea7597c59a24		 pdf-font-stream PDF embedded font (sfnt) at offset 0x86AB 4760 bytes
font_01_sfnt_off000096d3.bin
34f40cdc878457e273eb374aa44da9d5723d7d7cda2d3aff387cdbac5249525f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x96D3 10076 bytes
font_02_sfnt_off0000b981.bin
aab6463beb1dfb937ca1f77048b48cd85c073455dbfda49ee6805ceef6b5ca33		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB981 16180 bytes

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