Malicious PDF — malware analysis report

Static analysis result for SHA-256 e7c798fd1528dcfb…

MALICIOUS

PDF

63.9 KB Created: 2020-11-07 21:30:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7976357dc824910d66f7f7438adc8fae SHA-1: 1d0d0ea4720599dcb01bb2be1b78c1b7636d7aad SHA-256: e7c798fd1528dcfb8d2971208cae6a0431dd4d2952d573d4daa870fcd59081ca
96 Risk Score

Malware Insights

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

The PDF document contains a large number of embedded external links, identified as a PDF link farm, suggesting an attempt to manipulate search engine results or redirect users to potentially malicious sites. The ML classifier strongly flagged this PDF as malicious, and the presence of embedded URLs further supports a malicious intent. While no scripts were explicitly extracted, the nature of the embedded links and the PDF structure points towards a content-driven lure, likely related to SEO manipulation or content distribution.

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 https://trafftec.ru/123?keyword=ninja+unblocked+games+66
    • https://julasunanuk.weebly.com/uploads/1/3/4/3/134308365/4819338.pdf
    • https://bibixofepo.weebly.com/uploads/1/3/4/2/134235383/fepuvuxepagada.pdf
    • https://zafimalomaw.weebly.com/uploads/1/3/4/4/134458932/sabuvimotolev.pdf
    • https://mumixopid.weebly.com/uploads/1/3/1/8/131872042/5088908040ee7d.pdf
    • https://wekowemawifov.weebly.com/uploads/1/3/4/2/134266616/8642772.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://nolapebav.files.wordpress.com/2020/11/togutodilamigelibix.pdf
    • https://uploads.strikinglycdn.com/files/71719fcf-89b8-4765-8525-80939f36a92b/21240036228.pdf
    • https://s3.amazonaws.com/fujadabez/mage_build_terraria_master_mode.pdf
    • https://denapemudil.files.wordpress.com/2020/11/download_fast_and_furious_tokyo_drift_in_hindi_hd.pdf
    • https://buxefonatis.files.wordpress.com/2020/11/xerelewuf.pdf
    • https://uploads.strikinglycdn.com/files/257dde40-fded-4740-81eb-5a0f29426204/toefl_itp_official_guide.pdf
    • https://zidurezinale.files.wordpress.com/2020/11/8204752957.pdf
    • https://pupirod.files.wordpress.com/2020/11/sagob.pdf
    • https://uploads.strikinglycdn.com/files/7c0a2b84-78d2-4083-9131-e14f6284eea5/the_servant_james_hunter_summary.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bb70.bin
b284da8545b2863b48d149dbc0240ef4785013ea61d438af8fcd75d63e03c759
pdf-font-stream PDF embedded font (sfnt) at offset 0xBB70 5564 bytes
font_01_sfnt_off0000ce5a.bin
a623f62a174312103ad9fa591e007cc043465eab3943667efe74b2a607932173
pdf-font-stream PDF embedded font (sfnt) at offset 0xCE5A 10816 bytes