Malicious PDF — malware analysis report

Static analysis result for SHA-256 64b64a6c24f066c4…

MALICIOUS

PDF

44.5 KB Created: 2020-07-07 11:02:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2020-09-15
MD5: 1eb3035d75e6f18adda45c7ee59fa868 SHA-1: 567ce977fcd829f912dbe0a5e585ce369e51c9c9 SHA-256: 64b64a6c24f066c475f2bc75c19a450c1918b75aa39e2b59b5c9f92be7be6a54
184 Risk Score

Malware Insights

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

The PDF document contains a large number of embedded links to external PDF files, indicating a link farm or SEO manipulation tactic. One of the primary links redirects to a known malicious domain, suggesting a phishing or malware distribution attempt. The ML classifier also strongly flagged this PDF as malicious.

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.com/wb?keyword=connecticut%20dmv%20manual%20audio#connecticut+dmv+manual+audio In PDF document text
    • http://files.mnjeweler.com/uploads/1/3/1/4/131437740/fomurogoxufirofaliz.pdfIn PDF document text
    • http://files.pennjournalconlaw.com/uploads/1/3/2/6/132682694/bawibixijuzawo.pdfIn PDF document text
    • http://files.stmarymagdalenewpg.org/uploads/1/3/1/8/131856531/badifa.pdfIn PDF document text
    • http://files.linhr.com/uploads/1/3/1/0/131070189/tabotusatoboza.pdfIn PDF document text
    • http://files.mackeiganmarketing.com/uploads/1/3/1/4/131452732/sodopafesub.pdfIn PDF document text
    • http://files.explorestanton.com/uploads/1/3/1/4/131453216/6741733.pdfIn PDF document text
    • http://files.yunkawasiperu.org/uploads/1/3/1/3/131379612/vizarifogumawov.pdfIn PDF document text
    • http://files.mylunarsign.com/uploads/1/3/1/8/131857482/6fcae3.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://wurumopo.files.wordpress.com/2020/06/70339393127.pdfIn PDF document text
    • https://bidazinefak.files.wordpress.com/2020/06/95762758540.pdfIn PDF document text
    • https://tofosigon.files.wordpress.com/2020/06/99393774006.pdfIn PDF document text
    • https://rawujax.files.wordpress.com/2020/06/suxafi.pdfIn PDF document text
    • https://bavorekivaso.files.wordpress.com/2020/06/nimimoxafitubosamuzabova.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_off0000711f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x711F 4776 bytes
SHA-256: d89a466955bb8e9660c0bb83402eb9edb7d0a6cc868ed01b5008a27847db73a8
font_01_sfnt_off00008142.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8142 10488 bytes
SHA-256: a44bf4dae101112b76a22f96d4fac7a35b6ab987dc14f7f3914bf1e686ba10b8