Malicious PDF — malware analysis report

Static analysis result for SHA-256 83cb223c88430e0c…

MALICIOUS

PDF

41.1 KB Created: 2020-08-24 04:17:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b8b9ab6b05546f5d47279be3eafdfe7c SHA-1: e0f3b53e774b4cd0e20e8d963300961f1094755d SHA-256: 83cb223c88430e0c678814ba804e63687bafd774ce0b6bc4e40f688495694dad
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to a redirector infrastructure known for malicious activity. The document body, though heavily obfuscated, contains a URL that leads to a malicious redirector and several other URLs that appear to be part of a link farm. The ML classifier strongly indicates maliciousness, and the presence of a malicious redirector URL is a high-confidence indicator of a phishing or redirection attack.

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.cc/pify?keyword=single+and+double+displacement+reactions+worksheet+1
    • http://files.allamericancargo.com/uploads/1/3/2/8/132815343/fametubuwe.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0432/3737/6157/files/5123479866.pdf
    • https://cdn.shopify.com/s/files/1/0431/8298/1281/files/bevizu.pdf
    • https://cdn.shopify.com/s/files/1/0439/1128/2843/files/97527866647.pdf
    • https://cdn.shopify.com/s/files/1/0436/2734/8121/files/1989_ashrae_fundamentals_handbook.pdf
    • https://cdn.shopify.com/s/files/1/0429/4583/9271/files/reading_comprehension_worksheets_grade_4.pdf
    • https://cdn.shopify.com/s/files/1/0463/5177/7954/files/visoja.pdf
    • https://cdn.shopify.com/s/files/1/0431/4506/8699/files/21884084963.pdf
    • https://cdn.shopify.com/s/files/1/0430/2451/5229/files/arithmetic_mathematics.pdf
    • https://cdn.shopify.com/s/files/1/0434/5010/6018/files/27272069167.pdf
    • https://cdn.shopify.com/s/files/1/0428/2603/9463/files/bhangra_paa_le_2019_song.pdf
    • https://cdn.shopify.com/s/files/1/0437/1913/1285/files/basic_english_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0430/0960/5791/files/uterine_leiomyoma_management_guidelines.pdf
    • https://cdn.shopify.com/s/files/1/0434/6327/8758/files/one_line_text_art.pdf
    • https://cdn.shopify.com/s/files/1/0437/8741/9806/files/zadebeturelege.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_off00005f92.bin
848efb2f9a4c699c9ba99cd3ceef8ee3b0a488f74c1f98799d153bbfcdbf9795		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5F92 5940 bytes
font_01_sfnt_off0000739e.bin
92dadc75f14939c686a2aaf00625cb9eb1277592f5148f4523956a82b7af0daf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x739E 10340 bytes

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