Malicious PDF — malware analysis report

Static analysis result for SHA-256 885c27ef305c04b0…

MALICIOUS

PDF

42.7 KB Created: 2020-08-07 05:41:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b10858c75b59ae28a759acd79aec1982 SHA-1: a1d47baef7f368a11d45a69ca7da6322dabb9b9f SHA-256: 885c27ef305c04b03b76f44513b0afcfdcdc02f98ce9b6b86f289a2062266ab6
150 Risk Score

Malware Insights

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

The PDF file contains numerous embedded links, with one specifically pointing to a known malicious redirector. The heuristic firings indicate this is a malicious redirector link and part of a link farm, designed to obscure the true destination. The ML classifier strongly supports the malicious nature of this PDF. The document body itself is heavily obfuscated but contains the primary malicious URL.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • 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.
  • 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=punctuation+rules+uk+pdf
    • http://files.gregoryscommercialcleaning.net/uploads/1/3/2/8/132813998/21026d7e41c62.pdf
    • http://files.mariemanski.com/uploads/1/3/1/6/131606271/4ff3cf.pdf
    • http://files.neverleaveonebehind.org/uploads/1/3/1/4/131454586/pefikisafurevajizip.pdf
    • https://cdn.shopify.com/s/files/1/0435/5024/5028/files/fabonem.pdf
    • https://cdn.shopify.com/s/files/1/0437/8840/2839/files/46129424258.pdf
    • https://cdn.shopify.com/s/files/1/0431/9805/4558/files/gigozapex.pdf
    • https://cdn.shopify.com/s/files/1/0429/1470/9663/files/96582067939.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/78108387577.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/rasebiv.pdf
    • https://cdn.shopify.com/s/files/1/0433/9856/1957/files/factors_influencing_academic_performance_of_students.pdf
    • https://cdn.shopify.com/s/files/1/0427/4143/2487/files/46233050647.pdf
    • https://cdn.shopify.com/s/files/1/0431/6990/6844/files/serulepewet.pdf
    • https://cdn.shopify.com/s/files/1/0430/7792/7063/files/23693338100.pdf
    • https://cdn.shopify.com/s/files/1/0431/8812/5857/files/8603224946.pdf
    • https://cdn.shopify.com/s/files/1/0432/3295/2477/files/convert_in_to_word_document_online.pdf
    • https://cdn.shopify.com/s/files/1/0433/8096/5534/files/jugevunuzigudamexamekil.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006aaf.bin
37d1178e3429f8022dfe7599f98ff44db363868d0f3946ba87df718ee96dba69		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6AAF 5212 bytes
font_01_sfnt_off00007c77.bin
996f8a0e1e9efb971325b1495cb2c41a8d19492e1f2960795080cf6741861514		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7C77 9900 bytes

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