Malicious PDF — malware analysis report

Static analysis result for SHA-256 f379e62bfd6b5f31…

MALICIOUS

PDF

43.9 KB Created: 2020-10-04 17:18:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 921023be8da36ac520a5fc0f0deb1067 SHA-1: 74f66930fa86f91031e7d6df76ebccfa9da81558 SHA-256: f379e62bfd6b5f31f4ecbdd966a874bc44c7a8d2948cea7097cf8391ba014596
184 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, many pointing to disposable hosting and redirecting to a malicious URL related to 'social media marketing packages'. The ML classifier strongly indicated maliciousness, and the presence of a redirector link confirms the intent to lead users to potentially harmful content. While no scripts were explicitly extracted, the structure and embedded links suggest a phishing or malware distribution attempt.

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://cctraff.ru/strik?keyword=social+media+marketing+packages+pdf In PDF document text
    • http://buwum.opticalwildlife.com/uploads/1/3/0/8/130873876/f3b56906c732b.pdfIn PDF document text
    • http://files.my2girlsgarden.com/uploads/1/3/0/7/130775522/4608300.pdfIn PDF document text
    • http://solidam.alittlebithereatidbitthere.com/uploads/1/3/0/7/130739415/3855132.pdfIn PDF document text
    • http://files.minty-moon.com/uploads/1/3/2/6/132681409/tulopiboribezuverile.pdfIn PDF document text
    • http://files.gibbonshospitality.net/uploads/1/3/1/3/131383493/69c7ca2a48314a7.pdfIn PDF document text
    • https://site-1038837.mozfiles.com/files/1038837/82075058080.pdfIn PDF document text
    • https://site-1037275.mozfiles.com/files/1037275/57516670078.pdfIn PDF document text
    • https://site-1036814.mozfiles.com/files/1036814/divufapinoruti.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/386bc7fe-5f2c-4263-9ddb-1cbb57a10291/xiwimego.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a85e1f4e-5045-4410-8288-362f0a9b3c69/31017753043.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/44f1702b-7016-48ee-a592-bde6958cde65/nezevujemavebeb.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1090e3c1-d449-4c34-bf34-0c68c557f34e/wivijibefebunokaxis.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/abbdd424-b480-4d29-bb7e-0ee0171fc4e3/sanako.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/7272/4897/files/pocket_watch_tattoo_designs_outline.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0476/8360/0550/files/36713538241.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/8349/7623/files/ragnarok_m_eternal_love_priest_leveling_guide.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0481/1862/8505/files/43258471994.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0317/4308/files/36638411893.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_off00006d80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6D80 5640 bytes
SHA-256: 0e456223e05cfdcbd52f3d37e9fe25b66912d93f30ac96d28755e47909e890a8
font_01_sfnt_off0000809d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x809D 9996 bytes
SHA-256: 5bb3752201d5be1e39b1a5507983f70612e7751f586166cdd30f68d08ac8dfac

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