Malicious PDF — malware analysis report

Static analysis result for SHA-256 568ef7aaff7524e1…

MALICIOUS

PDF

34.2 KB Created: 2020-05-24 21:01:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 347b2bcf79c5a801dfd543d5f096b9bc SHA-1: 48dc2d1a70f7f640c11f2b3f6708f54b86c2021a SHA-256: 568ef7aaff7524e11b55e4cf9f08874ae4b1d701a653b535d13aaa4e3895a23e
94 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by an ML classifier. It contains a large number of external links, many of which point to similarly structured URLs on different domains. The document body contains text related to a 'Sakura swim club walkthrough guide', suggesting a lure to attract users to click on these links. The primary attack pattern appears to be a link farm designed to redirect users to potentially harmful content or for SEO manipulation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://badbehaviorrp.com/uploads/1/3/1/8/131856173/131856173.html#sakura+swim+club+walkthrough+guide
    • http://alisoviejovet.preview.pethealthnetworkpro.com/uploads/1/3/1/4/131407798/wijakasuneru.pdf
    • http://glaucomed.com/uploads/1/3/0/6/130640123/sijixar.pdf
    • http://pivoinehk.com/uploads/1/3/0/3/130313561/7729347.pdf
    • http://my-drink-list.com/uploads/1/3/0/4/130436140/08ae844334.pdf
    • http://fitnessfixx.org/uploads/1/3/1/4/131407227/3472422.pdf
    • http://chaosdragonboats.org/uploads/1/3/1/3/131382133/nesage.pdf
    • http://millsdigital.com/uploads/1/3/0/4/130435807/241129.pdf
    • http://mountaincreekcondoforrent.com/uploads/1/3/0/6/130604739/ragovositar.pdf
    • http://hvtmart.com/uploads/1/3/1/6/131606121/visevo.pdf
    • http://endura.capital/uploads/1/3/1/3/131383753/5822935.pdf
    • http://californiaregionalpatrol.com/uploads/1/3/0/4/130476347/7208481.pdf
    • http://goodzngifts.com/uploads/1/3/1/4/131412181/runik.pdf
    • http://galroga.com/uploads/1/3/1/8/131857144/4d186445f9.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_off00005bc0.bin
ab097deb78b3a69ac27bdc5b07a851afbba09bd354c894935164c3dc253b911b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5BC0 9884 bytes

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