Malicious PDF — malware analysis report

Static analysis result for SHA-256 5109d1fcf5ed30f2…

MALICIOUS

PDF

80.6 KB Created: 2020-09-30 00:43:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 040d6a708c3287867022b749d3560414 SHA-1: ed0245a22d46e913ea55d4180f58beb4837e412c SHA-256: 5109d1fcf5ed30f2538748cf1f075690d0827e8d2bbae60bbca95cdba0e7433b
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a large number of embedded links, many pointing to disposable domains and potentially malicious redirectors. The ML classifier strongly indicated maliciousness, and heuristics confirm it acts as a link farm, likely to manipulate search engine results or distribute further malicious content. The primary URL identified is https://gettraff.ru/strik?keyword=bakara+suresi+meali+pdf.

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://gettraff.ru/strik?keyword=bakara+suresi+meali+pdf In PDF document text
    • https://site-1036781.mozfiles.com/files/1036781/79990808376.pdfIn PDF document text
    • https://site-1036835.mozfiles.com/files/1036835/14082801928.pdfIn PDF document text
    • https://site-1036775.mozfiles.com/files/1036775/xefogejigimavuw.pdfIn PDF document text
    • https://site-1036751.mozfiles.com/files/1036751/satafotuzalo.pdfIn PDF document text
    • https://site-1036764.mozfiles.com/files/1036764/faxeni.pdfIn PDF document text
    • http://files.dirtfrogfurniture.com/uploads/1/3/2/7/132712326/a0a4d9ba144.pdfIn PDF document text
    • http://files.anniepfluegerphotography.com/uploads/1/3/0/7/130740401/vodawovabirabole.pdfIn PDF document text
    • http://sotoji.davetk.com/uploads/1/3/1/0/131070458/483ce9cdf7.pdfIn PDF document text
    • http://vakokaz.wiwomenvote.org/uploads/1/3/0/7/130776791/kadomilunizaju_diten_dazom.pdfIn PDF document text
    • http://files.mondaymorningmusicclub.org/uploads/1/3/2/6/132695780/1043747.pdfIn PDF document text
    • https://site-1036826.mozfiles.com/files/1036826/fisamibuveragenelu.pdfIn PDF document text
    • https://site-1036681.mozfiles.com/files/1036681/pufabumelifijasonopozelor.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/b8ce7879-22ec-48ee-a2bf-559da4795d7e/gupixirukezadevukamogew.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/db36a63b-3104-4efd-9b69-8f7a71092a3e/29410606269.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_off0000fd87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD87 5300 bytes
SHA-256: aa75714624e8e6cba9e2c29ec136a6d45df64edbe82abb56f4dca16f9fa0498a
font_01_sfnt_off00010f7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F7E 11996 bytes
SHA-256: 8c5d1d27e5a7f92c38f1d87e58c8ba4ebe09ff9fb8108af2a35eabdf373a85ad

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