Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a2dd1bdcf55fe66…

MALICIOUS

PDF

43.7 KB Created: 2020-07-24 18:43:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1fd6c0905ab6b8aa3754f5588e506779 SHA-1: cd6e1bd1d06f39b11536773e7dae93243fd1635e SHA-256: 0a2dd1bdcf55fe669518db00c48ded201efe43d2716239876389fce22bf278cc
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains embedded links that redirect to malicious infrastructure, specifically identified by the 'PDF_MALICIOUS_REDIRECTOR_LINK' heuristic. The document body, though heavily obfuscated, contains text that appears to be a lure for a game leveling guide. The presence of numerous external PDF links, as flagged by 'PDF_SEO_LINK_FARM', suggests an attempt to distribute content or traffic through a link farm. The ML classifier also strongly indicated maliciousness.

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=ignite+flyff+leveling+guide
    • http://files.jpvahelloworld.com/uploads/1/3/0/7/130739971/21252ef18e.pdf
    • http://files.peakhealthcaremaryland.com/uploads/1/3/1/4/131406816/rizapisopasiraluzoga.pdf
    • http://files.stacygardner.ca/uploads/1/3/2/7/132740620/wurusexexabiluboku.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0428/8688/9625/files/patidiwaxirafa.pdf
    • https://cdn.shopify.com/s/files/1/0432/5965/8398/files/32935052595.pdf
    • https://cdn.shopify.com/s/files/1/0429/1251/4201/files/57327311357.pdf
    • https://cdn.shopify.com/s/files/1/0428/4655/2227/files/gasadamowa.pdf
    • https://cdn.shopify.com/s/files/1/0434/5069/5830/files/jifidipufesi.pdf
    • https://cdn.shopify.com/s/files/1/0430/8166/2628/files/40122229546.pdf
    • https://cdn.shopify.com/s/files/1/0433/6700/6364/files/62276301060.pdf
    • https://cdn.shopify.com/s/files/1/0429/6572/9429/files/lejafif.pdf
    • https://cdn.shopify.com/s/files/1/0434/3103/5032/files/37550647864.pdf
    • https://cdn.shopify.com/s/files/1/0434/5734/7749/files/32182857873.pdf
    • https://cdn.shopify.com/s/files/1/0433/8283/3308/files/vimatizidukunevoxawumonut.pdf
    • https://cdn.shopify.com/s/files/1/0431/5647/1959/files/8623439615.pdf
    • https://cdn.shopify.com/s/files/1/0435/8746/9471/files/22437273359.pdf
    • https://cdn.shopify.com/s/files/1/0431/5778/2690/files/41166834464.pdf
    • https://cdn.shopify.com/s/files/1/0427/8799/5807/files/30513774709.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006e56.bin
c32f52d07b582bda20f0317c3c12d5a951f60559770da0e0d2e35c000477aff4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6E56 4464 bytes
font_01_sfnt_off00007d9f.bin
0da6da1a8a21a98849f76112006592cb59ca9205c413a79b459a56a345d3373c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7D9F 10676 bytes

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