Malicious PDF — malware analysis report

Static analysis result for SHA-256 efe5d0052808c234…

MALICIOUS

PDF

42.2 KB Created: 2020-07-10 16:00:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2020-09-15
MD5: 911fbf4e878237ff08239f27ea73c9e5 SHA-1: 36c794ec91a06a5ced85c07090fa4e77fbf511f1 SHA-256: efe5d0052808c2344720f07a8b0423ea52bc24077f828d516bcb58a4d9d698f9
184 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to a link farm designed for SEO manipulation. One prominent link, 'https://ttraff.ru/wb?keyword=download%20prezi%20presentation%20pdf', acts as a redirector to a series of other PDF files. This suggests a campaign to drive traffic to malicious or potentially malicious content through deceptive lures.

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://ttraff.ru/wb?keyword=download%20prezi%20presentation%20pdf In PDF document text
    • http://files.chen-lu.co/uploads/1/3/1/4/131406269/lesovigogal.pdfIn PDF document text
    • http://files.dizzycoach.com/uploads/1/3/0/8/130874129/redesoba-xurun.pdfIn PDF document text
    • http://files.dental-device.com/uploads/1/3/2/6/132695489/8cd911c6.pdfIn PDF document text
    • http://files.trevelle.com/uploads/1/3/0/8/130874513/bb41cc.pdfIn PDF document text
    • http://files.caroldonlon.com/uploads/1/3/1/4/131405940/rameneriwizol.pdfIn PDF document text
    • http://files.kwfootography.com/uploads/1/3/0/7/130775050/333e17e.pdfIn PDF document text
    • http://files.missbrittanyteaches.com/uploads/1/3/2/8/132815385/tedudozefexu.pdfIn PDF document text
    • http://files.mltcoins.com/uploads/1/3/0/8/130874647/jurosomegenuxoguza.pdfIn PDF document text
    • http://files.gemmstts.com/uploads/1/3/0/7/130740493/xezolujibebiron.pdfIn PDF document text
    • http://files.fredhaaseart.com/uploads/1/3/1/3/131378918/kesoze.pdfIn PDF document text
    • http://files.theepikapproach.com/uploads/1/3/2/8/132815008/afe1625eed.pdfIn PDF document text
    • http://files.burghyart.com/uploads/1/3/1/8/131871772/vevelu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://repotava.files.wordpress.com/2020/06/xoxunatemedowirusazul.pdfIn PDF document text
    • https://nuxezobexet.files.wordpress.com/2020/07/71129315762.pdfIn PDF document text
    • https://zemijedo.files.wordpress.com/2020/06/xedaworakufos.pdfIn PDF document text
    • https://kojuxow.files.wordpress.com/2020/07/42548807892.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/35209966956.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/8451/3440/files/95121142914.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/texojorigerusoxuduk.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006822.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6822 4964 bytes
SHA-256: e38ffccdf212948ef3951b9f4d3aa0969d8d91b926e2873cc445f6fc69788780
font_01_sfnt_off00007927.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7927 10124 bytes
SHA-256: 0e9d5e0fba7ed2a8167b9eb756dc9b8d2c0a5a782050af3d40700b2a8eb6254a

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