Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6a636ba74bdce8e…

MALICIOUS

PDF

38.4 KB Created: 2020-04-02 01:47:49 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 15b4532060ea33496bd7a3e3105ffa99 SHA-1: 8e5a872effb71f1b0eb2ef76a997f8477b684c4e SHA-256: b6a636ba74bdce8e5941585460b8abfcc1fa980a8e8d24827f8a3efb58091398
94 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 User Execution: Malicious File

The PDF contains a large number of external links, many of which point to other PDF files, suggesting a link farm or SEO poisoning tactic. The document body text, though partially corrupted, mentions 'Royal caribbean how to prepay gratuities', likely a lure to encourage clicks on the embedded URLs. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of a 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://kencoenvironmental.com/uploads/1/3/0/3/130313610/130313610.html#royal+caribbean+how+to+prepay+gratuities
    • http://stylingcantaluppi.com/uploads/1/3/0/6/130605275/3bc6924442.pdf
    • http://bhoffmannassessoriaesportiva.com/uploads/1/3/0/6/130639465/tinukuwob_kudikatuzu_zupedok_marovuzo.pdf
    • http://poolermassage.com/uploads/1/3/0/7/130776523/lewoj.pdf
    • http://musesinthevineyard.com/uploads/1/3/0/7/130776555/594072.pdf
    • http://cozmomcares.com/uploads/1/3/0/8/130873861/tamika.pdf
    • http://1969karmannghia.com/uploads/1/3/0/7/130775528/78478eb.pdf
    • http://minnesotacomfortfood.com/uploads/1/3/0/6/130640090/poxibunu-naminege-rokomipovataz-piweri.pdf
    • http://cherynmusic.com/uploads/1/3/0/2/130272241/fb6748a6.pdf
    • http://mcypaa41.com/uploads/1/3/0/2/130289749/ditupidesexane-refulare.pdf
    • http://privatelabelatlanta.com/uploads/1/3/1/4/131406149/ca4b081.pdf
    • http://go-vegan.org/uploads/1/3/0/6/130604848/6324591.pdf
    • http://innocentbakery.com/uploads/1/3/0/7/130738919/xonitap.pdf
    • http://mollyjoseph2.com/uploads/1/3/0/4/130490218/gelolawo-puvomurefibo.pdf
    • http://estimatingformulagenerator.com/uploads/1/3/0/4/130483765/3133842.pdf
    • http://qualityhouston.com/uploads/1/3/0/7/130740292/37062.pdf
    • http://fribergfysikalske.com/uploads/1/3/0/7/130740017/nobajubedexuw_jidujok_pemugu.pdf
    • http://misadventuresinmusic.com/uploads/1/3/0/9/130969798/460ca46915.pdf
    • http://cpanel.demo.famhealth.com/uploads/1/3/0/9/130969353/kumarolibotewozerur.pdf
    • http://smarthomevancouverwa.com/uploads/1/3/0/5/130551155/c379743fa930.pdf
    • http://miko-trans.pl/uploads/1/3/0/4/130476821/bamelax_mafolifuje.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_off00006edf.bin
1da88973bf05cb50f09f59a1559b232c5aacaa312cdb7141b00e4b63fd15eacd
pdf-font-stream PDF embedded font (sfnt) at offset 0x6EDF 7384 bytes