Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c445b116dbb0e60…

MALICIOUS

PDF

44.1 KB Created: 2020-08-30 10:21:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0b08677a59b8412d8ba52a7cf8a25f77 SHA-1: 5129e1a4c081f639abc05375b1efb658e445c62f SHA-256: 3c445b116dbb0e60627f3765620a1a5f1ffb1f7c7653ea657c0603ec308f1ca5
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF file was flagged as malicious by a machine learning classifier and contains a significant number of embedded links. One critical heuristic identified a link to known malicious redirector infrastructure (ttraff.ru), and another identified a large PDF link farm. While the document body is heavily obfuscated, the presence of numerous links suggests a phishing or malware distribution attempt. No scripts were extracted from this sample.

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/wix?keyword=exercicios+termodinamica+projeto+medicina
    • https://cdn.shopify.com/s/files/1/0437/5996/0218/files/sebadevibolirufovezezi.pdf
    • https://cdn.shopify.com/s/files/1/0444/2842/7431/files/23804450237.pdf
    • https://cdn.shopify.com/s/files/1/0432/7692/7134/files/java_code_for_calculator_in_android_studio.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/vijob.pdf
    • https://static.usrfiles.com/ugd/b8c837_2690526b94a94a67b546ec5c4e8430a1.pdf
    • https://static.usrfiles.com/ugd/1decf9_61a16ac58a4847ab9df6b5adbd9aec27.pdf
    • https://static.usrfiles.com/ugd/b8c837_81418c9c9295414bab32f84ffde8d439.pdf
    • https://static.usrfiles.com/ugd/d902bb_06186ce1d3704b85ae88dafee8d04785.pdf
    • https://static.usrfiles.com/ugd/3826db_cfc621677eb54b9e986383ad44420f9a.pdf
    • https://static.usrfiles.com/ugd/314c35_807cd44e4cf9454eb3ca9692451f73d5.pdf
    • https://static.usrfiles.com/ugd/d4da64_ca7e4c8813fe4e0ea4b26109d7c6b474.pdf
    • https://static.usrfiles.com/ugd/79e5df_e1676b940efb4c468fb4983610bd2e84.pdf
    • https://cdn.shopify.com/s/files/1/0431/5077/0333/files/26767497690.pdf
    • https://cdn.shopify.com/s/files/1/0435/7573/8527/files/security_incident_report_form_template_word.pdf
    • https://cdn.shopify.com/s/files/1/0436/1050/5373/files/joven_water_heater_installation_guide.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000589d.bin
d679b5f3ea1634f478cd9bca192ae0a2aebfeeeb90d0faa0f6b363479663f84e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x589D 5288 bytes
font_01_sfnt_off00006a82.bin
e79bd09e498fcf6a2ad501287e13046175bcf71ef1827b8b786f4bdfc5a61e75		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6A82 10256 bytes
font_02_sfnt_off00008d9f.bin
975089639afea594160f6daa1ae948ffc4125994d61a9fd32dce02580f7b6b15		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8D9F 16312 bytes

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