Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b23bc8430d7715f…

MALICIOUS

PDF

57.4 KB Created: 2020-09-30 15:08:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 17cf007e383dbba777dbffbab72c7fc3 SHA-1: e459a757f670322c78cd6559f4ddf1fe377210b2 SHA-256: 3b23bc8430d7715fee588c48569dc806d4f051f3d23c3debc2674d12e3794592
124 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, with at least one identified as a malicious redirector. The ML classifier strongly flagged this PDF as malicious, and heuristics indicate it's part of a link farm on disposable hosting. The document body, though heavily obfuscated, contains a URL that matches the malicious redirector, suggesting the primary purpose is to drive traffic to malicious sites.

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://gettraff.ru/strik?keyword=cassava+starch+production+pdf In PDF document text
    • http://files.myleafandcompany.com/uploads/1/3/0/8/130814286/3851c.pdfIn PDF document text
    • http://files.doctormabuse-themovie.com/uploads/1/3/1/4/131409385/vukegi.pdfIn PDF document text
    • http://files.thujar.ca/uploads/1/3/0/7/130776262/3792505.pdfIn PDF document text
    • http://files.hailstateunis.com/uploads/1/3/0/7/130775310/6398440.pdfIn PDF document text
    • https://site-1036851.mozfiles.com/files/1036851/vesidazubij.pdfIn PDF document text
    • https://site-1036819.mozfiles.com/files/1036819/12111822354.pdfIn PDF document text
    • https://site-1037077.mozfiles.com/files/1037077/banexeduzovasu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.opentle.orgIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/6127/0935/files/26285658647.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/9148/5091/files/idsa_guidelines_osteomyelitis.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/8396/4324/files/batekisavudevopoze.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/7795/8822/files/bank_promotion_exam_study_material.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/3458/1911/files/dudixigazodeb.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
    • http://www.gnu.org/licenses/gpl.htmlIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000940f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x940F 5176 bytes
SHA-256: 65dccf92d5ff326956d39371311e6855fbbbd5586668d65f2d3a4e588e0002c4
font_01_sfnt_off0000a5a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA5A1 5996 bytes
SHA-256: 0fd9d2d85a2748108db4e6dab248f2666d81f719974ab84549d0750b23316a04
font_02_sfnt_off0000b4fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4FD 10512 bytes
SHA-256: 7dfad40ca5e7e194486b8f1fb28136e79b21cff6454a8b863968a94fbfbac60f

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