Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f8fdb16ed24a50d…

MALICIOUS

PDF

41.4 KB Created: 2020-04-12 14:28:10 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 2aa92ea219cd51d2f8d1dbfb44c2b0fb SHA-1: 9daa0eb9fd188b60247c368265cf610eb5150649 SHA-256: 6f8fdb16ed24a50dc6bad93301f1f9dfd5fee8f1e51553e17e77fdd11a64fec1
136 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF document exhibits characteristics of a link farm, with a high number of embedded URLs pointing to external PDF files. The ML classifier strongly indicates maliciousness, and the PDF_SEO_LINK_FARM heuristic confirms the presence of numerous external links. The document body contains garbled text and a reference to 'Death note l change the world novela', suggesting a lure or obfuscation tactic.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://weightedword.com/uploads/1/3/0/5/130588803/130588803.html#death+note+l+change+the+world+novela
    • http://thomascoke.net/uploads/1/3/0/9/130969475/ledasuteze.pdf
    • http://xiarawellness.org/uploads/1/3/1/4/131407494/difesud_satirexo_mujujorolo.pdf
    • http://lecorbeauwoodworking.com/uploads/1/3/1/3/131384016/bonovuwox.pdf
    • http://ottawaresidentialcommercialexteriors.ca/uploads/1/3/0/7/130738546/nojukofakopid-pebiwas-rulurutadifase-kulodonanivig.pdf
    • http://nepservicesinc.com/uploads/1/3/1/3/131398235/tiwuzaniv-rorosiwe-kopisoxukebu.pdf
    • http://itschristinechun.com/uploads/1/3/1/4/131455247/5d3d85d.pdf
    • http://elmerlexmond.com/uploads/1/3/0/6/130639021/vepiridoxegox_tenike.pdf
    • http://umoremio.com/uploads/1/3/0/7/130739646/22192304647.pdf
    • http://cweventstaff.com/uploads/1/3/0/5/130543006/bupijarudisexar.pdf
    • http://tabletopmatters.com/uploads/1/3/0/6/130639098/lolufazure.pdf
    • http://laverneontap.com/uploads/1/3/1/0/131071309/rotided.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://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000062ec.bin
31987313fa9e3afbf706d2b1ca93c6b4f1cbb00b91b1f3c8aab68f57fb48267c
pdf-font-stream PDF embedded font (sfnt) at offset 0x62EC 9692 bytes
font_01_sfnt_off00008300.bin
779aa567746046747dac965df7fdfb06ff632674a0a99ce247a327bf89f0fa63
pdf-font-stream PDF embedded font (sfnt) at offset 0x8300 16036 bytes