Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f7498599e13c6ff…

MALICIOUS

PDF

49.2 KB Created: 2020-08-01 14:30:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6d9a7acc2418e37744d2c500444ecb21 SHA-1: 02aa49832c0d09c02efd9a669bd951ce88bcc0f1 SHA-256: 6f7498599e13c6ff664dfbaa5009e0bf250755579eff2d19daf38446552eeea4
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for linking to known malicious redirector infrastructure, specifically 'https://ttraff.cc/pify?keyword=transparent+color+code'. Additionally, it exhibits characteristics of a PDF link farm, with numerous embedded links, many pointing to Shopify domains. The ML classifier also strongly flagged this PDF as malicious. No scripts were extracted, but the presence of embedded URLs and the redirector link strongly suggest an attempt to lead the user to a malicious site, likely for further exploitation or phishing.

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=transparent+color+code
    • http://files.montclairschoolsdata.org/uploads/1/3/0/9/130969545/jimug.pdf
    • http://files.alaog.net/uploads/1/3/0/7/130739385/59181fc5d14fe2.pdf
    • http://files.thegardenrecipe.com/uploads/1/3/1/3/131398145/widufijudilesi_xusesobojore_damavamenegi_xubekatelow.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0435/2756/9576/files/9087414825.pdf
    • https://cdn.shopify.com/s/files/1/0428/7063/6710/files/banakasisefo.pdf
    • https://cdn.shopify.com/s/files/1/0430/7592/8215/files/85647137472.pdf
    • https://cdn.shopify.com/s/files/1/0427/9320/5916/files/76568897794.pdf
    • https://cdn.shopify.com/s/files/1/0428/2118/9788/files/temodopurobifaga.pdf
    • https://cdn.shopify.com/s/files/1/0429/5114/7676/files/40861444425.pdf
    • https://cdn.shopify.com/s/files/1/0437/8345/4872/files/64520370467.pdf
    • https://cdn.shopify.com/s/files/1/0432/4959/8632/files/fokusitasumara.pdf
    • https://cdn.shopify.com/s/files/1/0433/4062/8136/files/tidebemolidevemonaji.pdf
    • https://cdn.shopify.com/s/files/1/0431/1459/4464/files/kowipajejibuxarorol.pdf
    • https://cdn.shopify.com/s/files/1/0433/7873/7302/files/basic_interview_questions_on_electrical_engineering_pdf.pdf
    • https://cdn.shopify.com/s/files/1/0431/0673/0144/files/14639481880.pdf
    • https://cdn.shopify.com/s/files/1/0429/9105/9097/files/bosixawajolugowijijaf.pdf
    • https://cdn.shopify.com/s/files/1/0430/1655/2605/files/zarugoginoro.pdf
    • https://cdn.shopify.com/s/files/1/0437/3122/2682/files/90398703615.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_off00007543.bin
48764cf84bf402591ff7b7226f2bd89486c369da42e99983eee842b8e8cfb250		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7543 5016 bytes
font_01_sfnt_off0000865c.bin
95efa4560e588530410989bb1c9db57c1eefa1e6c1ebabf7bc9824a099af92f1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x865C 15592 bytes

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