Malicious PDF — malware analysis report

Static analysis result for SHA-256 aef37df5bbfc0465…

MALICIOUS

PDF

38.9 KB Created: 2020-06-17 07:41:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2020-08-25
MD5: 9df80fea1eba3c1c67769db2f7794088 SHA-1: 27d6c75e51e920c93e906f5f967621680ed0ff97 SHA-256: aef37df5bbfc04650d9c3db38564cbd4dcc2fb40a476a6f28fdd22447d9b4e78
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of external links pointing to SEO-optimized PDF files hosted on various domains. This pattern is indicative of a link farm or traffic redirection scheme. The ML classifier strongly supports the malicious nature of this PDF. No scripts were extracted, and the document body is heavily obfuscated, but the presence of numerous external links is the primary indicator of malicious intent.

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://powerwindowpartscom.com/uploads/1/3/1/6/131606124/131606124.html#convertir+pdf+en+jpg+online PDF link annotation
    • http://roofingcharlestonsc.com/uploads/1/3/0/7/130739783/eb3f115.pdfIn PDF document text
    • http://grupoforrajeroxalos.net/uploads/1/3/0/4/130436033/19463ee1.pdfIn PDF document text
    • http://koinoniamissions-org.davidmichaeldesigns.com/uploads/1/3/0/3/130324440/kudanutolufus-kupoxefal-zudaj-familinine.pdfIn PDF document text
    • http://afterflowacademy.com/uploads/1/3/0/3/130323889/zidujafavuru.pdfIn PDF document text
    • http://globalnationalfunding.com/uploads/1/3/0/9/130969411/2440354.pdfIn PDF document text
    • http://texassomms.com/uploads/1/3/1/8/131858791/pikefak-mifixura.pdfIn PDF document text
    • http://jenniemoorepta.com/uploads/1/3/0/4/130483062/sovofobezezi.pdfIn PDF document text
    • http://geosfotografia.com/uploads/1/3/0/6/130620776/guridodebad.pdfIn PDF document text
    • http://hostmaster.kidwellybowls.com/uploads/1/3/0/6/130604312/9234830.pdfIn PDF document text
    • http://enjoythecbd.net/uploads/1/3/0/2/130291908/diwurobodebuwim-pemusopofat-mamodozofo-niginebaseraso.pdfIn PDF document text
    • http://easymacsupport.com/uploads/1/2/9/0/129099120/129099120.html?solidworksIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off00005a16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5A16 4768 bytes
SHA-256: f31c6c5500f993e97455a17f133322655952a81470c0037498f56fb76a86379a
font_01_sfnt_off00006a69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6A69 11464 bytes
SHA-256: 0201347da615d3b7765998279d90283e43532a9dc53c34b1316dab141fcf73bb