Malicious PDF — malware analysis report

Static analysis result for SHA-256 1e44af0f390ef17c…

MALICIOUS

PDF

46.7 KB Created: 2020-10-02 03:11:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: af3a1d99681cf2414e052b0412b4a880 SHA-1: ec877d3e409575db5056cfc2d6a1376b31bd99b6 SHA-256: 1e44af0f390ef17c121f68546a5d4988c1f757fcac178e6fd5cecdf56e0ccc5c
124 Risk Score

Malware Insights

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

The PDF contains embedded URLs, with one identified as a malicious redirector. The ML classifier strongly flagged this PDF as malicious, and heuristics indicate it is part of a link farm on disposable hosting. The document body, though heavily obfuscated, contains the malicious URL, suggesting an attempt to trick the user into visiting it.

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 is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://cctraff.ru/strik?keyword=textos+con+faltas+de+ortografia+para In PDF document text
    • http://kewet.cornellactuarialsociety.com/uploads/1/3/0/9/130969627/rojikavugikilej-xavukoponupi-litix-vipewoduzafomom.pdfIn PDF document text
    • http://wevisuta.foxhomeinspectionllc.net/uploads/1/3/1/4/131452903/sidevur.pdfIn PDF document text
    • https://site-1036874.mozfiles.com/files/1036874/55235321413.pdfIn PDF document text
    • https://site-1036659.mozfiles.com/files/1036659/7272327980.pdfIn PDF document text
    • https://site-1040387.mozfiles.com/files/1040387/41706298690.pdfIn PDF document text
    • https://site-1037091.mozfiles.com/files/1037091/43815247575.pdfIn PDF document text
    • https://site-1039438.mozfiles.com/files/1039438/4030254974.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/5fce9249-a998-469d-a5b1-1ddfc895752d/waludadijutoxevegaduwobul.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0b019d8d-0373-4284-b423-ef7d248033e3/soxowivogapuzab.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c18d6ceb-e398-40d3-93e3-0d930d9604bf/pifelamaluvesenekifulaka.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/28300b89-378c-4354-a897-42a4395ab6e2/66249263426.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0482/4891/4081/files/44222167582.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/6187/8687/files/52269523433.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/5947/6630/files/sat_math_notes.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/5269/3669/files/60575941455.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000074ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x74EE 5340 bytes
SHA-256: 6fe73123480a16a1f8ebc0ae4ed61ddd780d402c72a298089f0cbc8368eada01
font_01_sfnt_off00008732.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8732 11468 bytes
SHA-256: 5b452a1f909b1e9da2fa71f4f92fbcad1a16bb9cc5913c7aba197897853a0aad

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