Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a8022bc47e3a283…

MALICIOUS

PDF

41.4 KB Created: 2020-08-12 03:38:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ec02a12753495c27b44a1850283913a7 SHA-1: 030229fc3821bc0607b0eb687eea1ae1f27652fb SHA-256: 5a8022bc47e3a28377290e26847556201a895b9796f90253ad3f0760a5dd00a5
154 Risk Score

Malware Insights

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

The PDF contains numerous links, many of which point to a link farm infrastructure designed to redirect users to malicious content, as indicated by the 'PDF_MALICIOUS_REDIRECTOR_LINK' and 'PDF_SEO_LINK_FARM' heuristics. The document body, though obfuscated, contains a URL that matches the malicious redirector found in the heuristics. The presence of embedded URLs and the ML classifier's high confidence score further support the malicious nature of this document.

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=pictionary+game+words+pdf
    • http://mirutiwi.robertleebaptistchurch.org/uploads/1/3/0/7/130776433/0ef4a2.pdf
    • http://belan.americanpeeragepress.com/uploads/1/3/1/1/131164250/varupunirabi_gupuxaxak.pdf
    • http://files.genellhowell.com/uploads/1/3/0/9/130969489/65936aa680490b.pdf
    • http://files.pozdolcounseling.com/uploads/1/3/0/8/130813781/refuninupibesi.pdf
    • http://files.gtrtl.org/uploads/1/3/2/6/132681144/vagafilofubewej.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/1675/7153/files/57666725306.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/63529720688.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/90685913575.pdf
    • https://cdn.shopify.com/s/files/1/0432/5464/4894/files/fikugemobilobapuzud.pdf
    • https://cdn.shopify.com/s/files/1/0429/8535/7463/files/mekozamovozidoluzoj.pdf
    • https://cdn.shopify.com/s/files/1/0431/1102/2756/files/les_accents_en_francais_grammaire.pdf
    • https://cdn.shopify.com/s/files/1/0437/1811/5480/files/63119120484.pdf
    • https://cdn.shopify.com/s/files/1/0449/5792/5544/files/building_computer_from_scratch.pdf
    • https://cdn.shopify.com/s/files/1/0431/7623/1063/files/85593616822.pdf
    • https://cdn.shopify.com/s/files/1/0434/8156/3286/files/merogo.pdf
    • https://cdn.shopify.com/s/files/1/0434/2166/3397/files/adp_payroll_calendar_2020.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_off00006204.bin
42eaa433f0a3986624237731177b173a1f7c7e85691ea5113c7f3784efb352b9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6204 5636 bytes
font_01_sfnt_off0000752b.bin
de42f985b778f4ab23c0ade0c0dcab5df545d3c728eaa24cd1b6ba6031434ffe		 pdf-font-stream PDF embedded font (sfnt) at offset 0x752B 10436 bytes

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