Malicious PDF — malware analysis report

Static analysis result for SHA-256 167e563bdd965acc…

MALICIOUS

PDF

41.2 KB Created: 2020-07-08 11:43:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: aedc21288fd53024b9f7db1f236bb421 SHA-1: f1faff906db9b025e6142f2dc7a2fd1373508a40 SHA-256: 167e563bdd965acc2811962ed0aacb522606bb4cc7a15438c1dccbd29ba68bc1
154 Risk Score

Malware Insights

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

This PDF document exhibits characteristics of a link farm, embedding numerous URLs that likely lead to further malicious content or SEO manipulation. The presence of a redirector link suggests an attempt to obscure the final destination and potentially evade detection. While no scripts were directly extracted, the ML classifier and the critical heuristic firings strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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.
  • 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=linq%20reference%20c#%20pdf
    • http://files.adriendemeure.com/uploads/1/3/1/4/131406295/57009.pdf
    • http://files.juneaumusicmatters.com/uploads/1/3/0/9/130968956/ronelipumive.pdf
    • http://files.sueannecelebrant.com/uploads/1/3/1/4/131437351/26ff42c.pdf
    • http://files.millertimegolfleague.com/uploads/1/3/2/7/132710575/fomagotigasopobesa.pdf
    • http://files.firstathens.org/uploads/1/3/2/7/132710687/9347935.pdf
    • http://files.sensibleshock.com/uploads/1/3/2/7/132740479/vasesejakukek_faxej_lelikam.pdf
    • http://files.bradleyestates.co.uk/uploads/1/3/2/6/132682570/wirifobeje.pdf
    • http://files.asianlifestyletv.com/uploads/1/3/1/4/131453007/4121461.pdf
    • http://files.musicatmainstreet.com/uploads/1/3/0/7/130739839/davetuxu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://molijokito.files.wordpress.com/2020/06/zibegabudazimavewozipagop.pdf
    • https://vazomirawan.files.wordpress.com/2020/06/14508994004.pdf
    • https://fatowil.files.wordpress.com/2020/07/vujazojefarusazuf.pdf
    • https://togifiviliv.files.wordpress.com/2020/06/39073990401.pdf
    • https://tazaluset.files.wordpress.com/2020/07/40606826438.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_off00005f1d.bin
2af55ab1687ccc7135c6206b493e2b492d9575ae8a378c48467f017adfdfb47d
pdf-font-stream PDF embedded font (sfnt) at offset 0x5F1D 4120 bytes
font_01_sfnt_off00006d10.bin
203b1c5152a2a668e7e74a2b3a7b87700de60baffe95772c3181501bb3e06738
pdf-font-stream PDF embedded font (sfnt) at offset 0x6D10 13588 bytes