Malicious PDF — malware analysis report

Static analysis result for SHA-256 0fcda64a1643d10f…

MALICIOUS

PDF

34.0 KB Created: 2020-04-13 07:21:46 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 2aa425656b6072728435ce399c883a99 SHA-1: 29bdd5800503adafeac5f4b16c4b13a77ec1ac16 SHA-256: 0fcda64a1643d10f457acaed18b511ccd85c83c6279b463acd316493e0b60c06
96 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a link farm, pointing to various PDF files hosted on different domains. The ML classifier strongly indicated maliciousness, and the embedded URL points to a page that is likely part of this link farm. This suggests the document's primary purpose is to redirect users to a network of potentially malicious or SEO-abused content.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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 http://suppy-taiwan.com/uploads/1/3/0/5/130552073/130552073.html#best+djembe+drum+for+beginners
    • http://britchap.com/uploads/1/3/0/5/130540072/wuxona-bavasu-linevibibate.pdf
    • http://grupoalfa.info/uploads/1/3/0/9/130969166/xigirubusira.pdf
    • http://fotographyhub.com/uploads/1/3/0/5/130546538/wozovumen_xovas_xanun_kajixazilu.pdf
    • http://unemployedinsummertime.com/uploads/1/3/0/5/130551188/2545564.pdf
    • http://soulsforkids.com/uploads/1/3/0/6/130605113/8960310.pdf
    • http://gcgbrokergeinc.com/uploads/1/3/0/5/130551417/21d6d33ba750.pdf
    • http://perfectedgeshop.com/uploads/1/3/1/0/131070591/ruzekeses.pdf
    • http://97litefm.com/uploads/1/3/1/4/131407005/8697af77ade99f.pdf
    • http://breathingbodymotion.com/uploads/1/3/0/4/130435914/tukelatanona.pdf
    • http://alfiewilling.com/uploads/1/3/0/4/130475877/dozifupoxe-sikonuna-lukowebozaxudo.pdf
    • http://vpmarketingtravel82.com/uploads/1/3/0/6/130603969/fipesi_tutaborovov.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000618f.bin
ecd3235779ec98dc591b447b4dd8ea78eaf79ff1e7c2cc3a50c00810b3747ae3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x618F 6732 bytes

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