Malicious PDF — malware analysis report

Static analysis result for SHA-256 8af90e0db3ae4e38…

MALICIOUS

PDF

45.5 KB Created: 2020-11-01 09:51:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 30d39b954434e143daa5e724fec848fc SHA-1: 041c7a57941a646484630c9d5e0f2bc6a68cfefe SHA-256: 8af90e0db3ae4e383e71e5d7723221f4abb2cf096a970a116a1289d5c7c6cee5
184 Risk Score

Malware Insights

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

The PDF file contains numerous embedded links, many pointing to disposable hosting or known redirector services, indicating a link farm designed to distribute malicious content. The ML classifier strongly flagged this PDF as malicious, and heuristic rules identified it as a redirector and a link farm on disposable hosting. While no scripts were directly extracted, the structure and embedded URLs suggest an attempt to lure users to malicious sites, likely as part of a phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • 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://ggtraff.ru/strik?keyword=on+the+value+of+philosophy+bertrand+russell In PDF document text
    • https://muvitaburire.weebly.com/uploads/1/3/4/4/134441723/jegetivezog.pdfIn PDF document text
    • https://pasuzexogisinib.weebly.com/uploads/1/3/4/2/134266431/5553abfd60.pdfIn PDF document text
    • https://xilorufanil.weebly.com/uploads/1/3/0/7/130739938/fosizutaxe-zuwup.pdfIn PDF document text
    • https://dokodajibebabek.weebly.com/uploads/1/3/2/3/132302773/5601807.pdfIn PDF document text
    • https://tanafojapazikop.weebly.com/uploads/1/3/4/5/134576724/sibajibo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0500/5498/7969/files/79239434666.pdfIn PDF document text
    • https://s3.amazonaws.com/leguvefu/35846012883.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/0745/1041/files/simple_workout_log_app_android.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0502/3943/9032/files/59937134882.pdfIn PDF document text
    • https://s3.amazonaws.com/vogubivajavofu/happy_birthday_and_merry_christmas_meme.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0505/9100/6888/files/76492209378.pdfIn PDF document text
    • https://s3.amazonaws.com/firigugixujotov/24900791250.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1123615c-e7df-4f07-a56d-ef32d7243095/4930615674.pdfIn PDF document text
    • https://s3.amazonaws.com/purawuma/baixar_mapa_mundi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0504/7697/4260/files/skype_video_call_for_android_mobile.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_off00007160.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7160 5456 bytes
SHA-256: fd47f9263d92c6b37deba7f46e1c2dba1e36d4bdc2f3e4927e64a4ad1e4fba95
font_01_sfnt_off000083eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x83EB 11012 bytes
SHA-256: 4b676aadc6042652c987d97c85387bcce1ec47cfb95b25937d165130b24d30e0

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