Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd37716e6ab9dd14…

MALICIOUS

PDF

45.1 KB Created: 2020-10-04 14:51:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 23a916d522d3cd702b6d82012a4fb9f2 SHA-1: 1465395760a74b454dcc15a071aae4c69ad3096c SHA-256: cd37716e6ab9dd145f383b71dcae147c50e3f293ac6c121c6906b5bb09fa73ea
124 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm and routes users through malicious redirector infrastructure. Specific URLs and indicators for this sample are listed in the indicators section.

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=star+wars+the+last+jedi+1080p+torrent In PDF document text
    • https://site-1038499.mozfiles.com/files/1038499/sobarorexe.pdfIn PDF document text
    • https://site-1036880.mozfiles.com/files/1036880/82215674690.pdfIn PDF document text
    • https://site-1036675.mozfiles.com/files/1036675/wifizavigeviwekalu.pdfIn PDF document text
    • https://site-1037071.mozfiles.com/files/1037071/25074702085.pdfIn PDF document text
    • https://site-1036962.mozfiles.com/files/1036962/70976832934.pdfIn PDF document text
    • https://site-1037157.mozfiles.com/files/1037157/74946451482.pdfIn PDF document text
    • https://site-1036730.mozfiles.com/files/1036730/dozivuli.pdfIn PDF document text
    • https://site-1036722.mozfiles.com/files/1036722/81627048051.pdfIn PDF document text
    • https://site-1041766.mozfiles.com/files/1041766/kiram.pdfIn PDF document text
    • https://site-1036722.mozfiles.com/files/1036722/kuxidejuf.pdfIn PDF document text
    • https://site-1039547.mozfiles.com/files/1039547/luwiluwo.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/f558d266-98ce-4039-8ff5-b8065a428ff1/62199007017.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6b2c9c06-50cc-45bd-98a1-2ac82ac37adc/nazoniji.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/05340e47-5a76-4cdf-a48f-e6f1caf263dc/1052100031.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0e9e37e3-0124-43b0-85b0-71af11f94f30/63666728817.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_off0000647b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x647B 5708 bytes
SHA-256: 16ea2ed423437c3a2c48760e7cfab91589a5246c947e4a7def958030d56e5f96
font_01_sfnt_off000077f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x77F1 16356 bytes
SHA-256: bc9b412a1542d1682cd27c087015d9c2c060624687d2a6b3580c38181faa0ab4

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