Malicious PDF — malware analysis report

Static analysis result for SHA-256 d16b8f4b814d2543…

MALICIOUS

PDF

37.1 KB Created: 2020-10-03 22:00:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 4d63dfd8683c6fda87464aaf24511275 SHA-1: 75f5510e372f38113725de036cc1b71622c53637 SHA-256: d16b8f4b814d25439eee3b2821dba53790f25304a2f470eb947034b72a1d1024
124 Risk Score

Malware Insights

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

The PDF contains embedded links that point to a known malicious redirector infrastructure. The document body, though heavily obfuscated, appears to contain the URL for the redirector, suggesting a phishing or scam attempt. No scripts were extracted, but the presence of malicious links is a strong indicator of malicious intent.

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=aashto+manual+for+bridge+evaluation+3rd+edition In PDF document text
    • https://site-1037125.mozfiles.com/files/1037125/85485683370.pdfIn PDF document text
    • https://site-1036731.mozfiles.com/files/1036731/9943196847.pdfIn PDF document text
    • https://site-1039695.mozfiles.com/files/1039695/xamita.pdfIn PDF document text
    • https://site-1041934.mozfiles.com/files/1041934/46112412067.pdfIn PDF document text
    • https://site-1036819.mozfiles.com/files/1036819/37316547822.pdfIn PDF document text
    • http://files.basinandrange.org/uploads/1/3/0/8/130874350/4667311.pdfIn PDF document text
    • http://xebot.wholisticlifecoaching.net/uploads/1/3/2/8/132815004/4b29b36fe3.pdfIn PDF document text
    • http://files.crossfitliveloud.com/uploads/1/3/1/0/131069738/monafutupapidikut.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/1/0482/5720/4378/files/yahoo_mail_password_recovery.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/7447/7464/files/holes_anatomy_and_physiology_15th_edition_access_code.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/3329/7058/files/solalezi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/0426/3585/files/45713484800.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2df15276-8c22-4d0f-9ca7-9dbf47803d76/papoxevitixoromupuse.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/88bd5b86-7e82-4fbf-b0f4-c05f14d7b3b2/kekokotarobakazunu.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000493d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x493D 5676 bytes
SHA-256: 9efc024312984d6b660c680db9f998ec429ba98a1ef56bd4b52c128be010bb62
font_01_sfnt_off00005c63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5C63 1912 bytes
SHA-256: 80a4cfd859b9bb1e8faa36d0b2de836cd4647eeb869bd113d8e2047271df502c
font_02_sfnt_off00006591.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6591 9756 bytes
SHA-256: 716b9330325b2184140740ef7f85ef3251b2b2c72a4b4982c5e07753998a9e29

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