Malicious PDF — malware analysis report

Static analysis result for SHA-256 1de636a666136be5…

MALICIOUS

PDF

47.6 KB Created: 2020-11-04 01:51:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: f5c6a96505bc748a856adf9ddd2ccbee SHA-1: 70ee8e4f1430022ce4963585edd86edf84dfe9cd SHA-256: 1de636a666136be580abe37862b62b20c8b75ee1be1c20c9efa4af27b1cee7ee
194 Risk Score

Malware Insights

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

The PDF contains multiple heuristics indicating it's a malicious redirector, specifically designed to host a link farm and lure users with an SEO-like title. The embedded URL 'https://gettraff.ru/aws?keyword=claim+of+value+essay+topic' is a known malicious redirector. The document body, though heavily obfuscated, contains this URL, reinforcing the lure. The ML classifier also strongly flagged this PDF as malicious.

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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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://gettraff.ru/aws?keyword=claim+of+value+essay+topic In PDF document text
    • https://serivuzoforin.weebly.com/uploads/1/3/4/3/134334639/7262748.pdfIn PDF document text
    • https://gazesomudari.weebly.com/uploads/1/3/1/0/131070071/347993.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366388/normal_5f91c481c0234.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366044/normal_5f906b4dbf91f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377381/normal_5f8ec32be1ecb.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/vezumobigodub/congenital_neurological_disorders.pdfIn PDF document text
    • https://s3.amazonaws.com/suxiweke/79651743125.pdfIn PDF document text
    • https://s3.amazonaws.com/wegugus/modifitifuvulizupovizegu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0506/6378/4637/files/density_dependent_factors_include.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/5197/4818/files/project_sustainability_monitoring_and_evaluation.pdfIn PDF document text
    • https://s3.amazonaws.com/bewibiwat/jarixemafebesalime.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_off00007e57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7E57 5132 bytes
SHA-256: d482b5c90396c405e147a3c8d7ef0f0406959e81b9b8b64faf9ec97b4134dfbd
font_01_sfnt_off00008fd4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8FD4 9852 bytes
SHA-256: a5e44d9bddef549480b6e27dd237b5f56ff02263d9ba56ab498934884c442aa4