Malicious PDF — malware analysis report

Static analysis result for SHA-256 9cf09c57bd91e42e…

MALICIOUS

PDF

31.5 KB Created: 2020-04-10 05:11:39 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 0e4762d88b48f695ffb8bdf6505430d2 SHA-1: 22f050a66dd25819951add08cd6d6b81ff64e7fb SHA-256: 9cf09c57bd91e42e2c078e13aa2e4c49e1cf9b196e1d82d77be7e8b0e7c37e94
94 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains numerous external links, a technique often used for SEO spam or to redirect users to malicious sites. The ML classifier strongly indicated maliciousness. While no scripts were extracted, the PDF structure and the high number of external links suggest a delivery mechanism for further compromise. The primary intent appears to be directing users to a network of linked websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://savinghalf.com/uploads/1/3/0/8/130874565/130874565.html#okidata+microline+420
    • http://tntunlimitedconsulting.com/uploads/1/3/1/4/131453170/1961492.pdf
    • http://shacklebusters.net/uploads/1/3/0/4/130435755/xadajuwawa_jomojeguvabedal_palarixok_lukurabopet.pdf
    • http://musicgiftsthatdontsuck.com/uploads/1/3/0/7/130776394/gepofekabawivaxulane.pdf
    • http://paulalauren.com/uploads/1/3/0/9/130968917/jokopanijo.pdf
    • http://angelagarnier.com/uploads/1/3/0/6/130639592/aa2ac5c9069c2.pdf
    • http://intergolfinc.net/uploads/1/3/0/5/130590698/nalevigoguguz_vogudiweruvib_zasotuperifop_waxidogitok.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_off00004f4a.bin
a0c38049a4604812bcc545f64fce4082d699dab3db0ae239baaeee78889b657e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4F4A 8556 bytes

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