Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd8d5bb8f6eb76d2…

MALICIOUS

PDF

47.9 KB Created: 2020-03-14 12:51:12 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 19e09bf281c5284ea3be69203822501b SHA-1: f9a5985fd905d3d2be56763b5bb3fc0b83f19169 SHA-256: dd8d5bb8f6eb76d2c3830881d6e0593776dfd71e203be7fdf6127cc10fbc60cc
94 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell

The PDF document contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic. The document body, though partially corrupted, contains references to 'Baidu news android app' and the authoring tool wkhtmltopdf, suggesting a lure or obfuscation tactic. The primary function appears to be distributing a vast number of URLs, likely to manipulate search engine rankings or to serve as a distribution point for further malicious content.

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://pfgzq.slpny.com/uploads/1/3/0/2/130289002/130289002.html#baidu+news+android+app
    • http://hostmaster.bentleyulrich.com/uploads/1/3/0/4/130483158/sanugiset.pdf
    • http://krisandandreawedding.com/uploads/1/3/0/5/130540661/rejakewa.pdf
    • http://www.regen-bioplastiques.ca/uploads/1/3/0/2/130272569/b6c458cc0cb4bf7.pdf
    • http://plussizebridaldressesnh.com/uploads/1/3/0/5/130588256/d4ae96670.pdf
    • http://oasisstyle.co/uploads/1/3/0/7/130740596/mewonafiraxem_tumujagipa_jusavetewox.pdf
    • http://georfacilityconstruction.com/uploads/1/3/0/2/130272333/wajumaruperulim.pdf
    • http://poochesandme.com/uploads/1/3/0/8/130873807/lusukagonivorux-juzamolazi.pdf
    • http://webmail.prowrestlinghistoricalsociety.com/uploads/1/3/0/7/130776504/wopasapakovel-tusanowevizorod-kutibedefidolij-gumenowosovu.pdf
    • http://robertoster.com.au/uploads/1/3/0/5/130543154/zijisejukubepa.pdf
    • http://infinitivetrustshop.com/uploads/1/3/1/0/131070490/gokuxoz-manis-dejabasofipok-mawapuno.pdf
    • http://hempbenefitshop.com/uploads/1/3/0/5/130544086/noman.pdf
    • http://bvibeaches.com/uploads/1/3/0/6/130621038/89019cc4349018.pdf
    • http://clicksruks.com/uploads/1/3/0/6/130603749/gisoganezun.pdf
    • http://lilymere.com.au/uploads/1/3/0/7/130775432/lurojomed-javixusugaz-xupunakofijubo.pdf
    • http://jswartwood.net/uploads/1/3/0/6/130620340/9258445.pdf
    • http://a-1environmentalservices.net/uploads/1/3/0/3/130379353/pijof.pdf
    • http://fatkidmacncheese.com/uploads/1/3/0/2/130291561/7767523.pdf
    • http://herdinglemurs.com/uploads/1/3/0/2/130288318/7b04de.pdf
    • http://ruefrancaise.com/uploads/1/3/0/6/130620916/jisososuti_tebixunomena_saraw_lorirafede.pdf
    • http://j-elberfeld.com/uploads/1/3/0/6/130605283/7203933.pdf
    • http://naturalbabymag.com/uploads/1/3/1/0/131071041/givam.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_off00009214.bin
4ecc31209a908d2a49409c837853d1bb8505861dc0b2bf8b8cdedf590995b90e
pdf-font-stream PDF embedded font (sfnt) at offset 0x9214 7912 bytes